2021
Mama Mouamfon Serge Ricardo Pobo Kenfack, Stephano Tambo Tene
Dans: International Journal of Biological and Chemical Sciences, vol. 15, no. 6, p. 2665-2684, 2021, ISSN: 1997-342X.
Résumé | Liens | BibTeX | Étiquettes:
@article{nokey,
title = {Effets de trois traitements culinaires sur les propriétés physico-chimiques, fonctionnelles et anti-oxydantes de l’igname sauvage (Dioscorea praehensilis Benth) cultivé dans la région de l’Est-Cameroun.},
author = {Serge Ricardo Pobo Kenfack, Mama Mouamfon, Stephano Tambo Tene, Jules Romain Ngueguim et Youchahou Poutougnigni Matenchi. 15(6): .},
url = {https://dx.doi.org/10.4314/ijbcs.v15i6.32},
doi = {10.4314/ijbcs.v15i6.32},
issn = {1997-342X},
year = {2021},
date = {2021-12-31},
journal = {International Journal of Biological and Chemical Sciences},
volume = {15},
number = {6},
pages = {2665-2684},
abstract = {Le «SAPA» (Dioscorea praehensilis Benth) est une espèce dont les liens socio-culturels conservés avec les Baka ne sont plus à démontrer. Son utilisation dans cette zone passe par plusieurs traitements culinaires (ébullition, braise…) qui affecte certaines propriétés jusqu’ici non encore élucidées. Le présent travail était axé sur la valorisation de D. praehensilis au Cameroun par l’étude de l’effet de quelques traitements culinaires sur ses propriétés physico-chimiques, fonctionnelles et anti-oxydantes. Le matériel végétal (échantillons cru, bouilli, braisé et cuit sous cendre), une fois séché et broyé a subi plusieurs analyses physico-chimiques, fonctionnelles et anti-oxydantes suivant des méthodes AOAC connues. Les résultats ont révélé que les teneurs en amidon et en amylose étaient élevées dans les échantillons bouillis (26,63±5,11) et ceux cuits sous cendre (55,49±0,25) contrairement à l’amylopectine. La valeur la plus élevée en sucre réducteur a été obtenue par cuisson à la braise (0,85±0,15) et la plus faible par ébullition (0,30±0,00). La teneur en saponines variait entre 0,77 (bouilli) et 1,70 mg/100 g de MS (cru et braise). L’échantillon cru a présenté une teneur en phytates plus élevée (18,30 mg/100 g de MS) alors que ceux bouillis et cuits sous cendre les valeurs les plus faibles (6,10 mg/100 g de MS) contrairement aux oxalates où on n’a pas observé de différence significative (P<0.005) entre traitements. Au regard des résultats, il ressort que les propriétés de D. praehensilis sont influencées par le traitement culinaire. Ainsi, la valorisation du «SAPA» au Cameroun pourrait prendre en compte ses caractéristiques culinaires.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Le «SAPA» (Dioscorea praehensilis Benth) est une espèce dont les liens socio-culturels conservés avec les Baka ne sont plus à démontrer. Son utilisation dans cette zone passe par plusieurs traitements culinaires (ébullition, braise…) qui affecte certaines propriétés jusqu’ici non encore élucidées. Le présent travail était axé sur la valorisation de D. praehensilis au Cameroun par l’étude de l’effet de quelques traitements culinaires sur ses propriétés physico-chimiques, fonctionnelles et anti-oxydantes. Le matériel végétal (échantillons cru, bouilli, braisé et cuit sous cendre), une fois séché et broyé a subi plusieurs analyses physico-chimiques, fonctionnelles et anti-oxydantes suivant des méthodes AOAC connues. Les résultats ont révélé que les teneurs en amidon et en amylose étaient élevées dans les échantillons bouillis (26,63±5,11) et ceux cuits sous cendre (55,49±0,25) contrairement à l’amylopectine. La valeur la plus élevée en sucre réducteur a été obtenue par cuisson à la braise (0,85±0,15) et la plus faible par ébullition (0,30±0,00). La teneur en saponines variait entre 0,77 (bouilli) et 1,70 mg/100 g de MS (cru et braise). L’échantillon cru a présenté une teneur en phytates plus élevée (18,30 mg/100 g de MS) alors que ceux bouillis et cuits sous cendre les valeurs les plus faibles (6,10 mg/100 g de MS) contrairement aux oxalates où on n’a pas observé de différence significative (P<0.005) entre traitements. Au regard des résultats, il ressort que les propriétés de D. praehensilis sont influencées par le traitement culinaire. Ainsi, la valorisation du «SAPA» au Cameroun pourrait prendre en compte ses caractéristiques culinaires.
Betti JL Essomba HS, Priso R
Diversity, structure and health of a cocoa based agroforest system in the Humid dense forest, East Cameroon. Article de journal
Dans: International Journal of Biodiversity and Conservation, vol. 13, no. 4, p. 165-182, 2021, ISSN: 2141-243X.
Résumé | Liens | BibTeX | Étiquettes:
@article{nokey,
title = {Diversity, structure and health of a cocoa based agroforest system in the Humid dense forest, East Cameroon.},
author = {Essomba HS, Betti JL, Priso R, Ngueguim JR, Njimbam OF.},
doi = {10.5897/IJBC2021.1494},
issn = {2141-243X},
year = {2021},
date = {2021-09-08},
urldate = {2021-09-08},
journal = {International Journal of Biodiversity and Conservation},
volume = {13},
number = {4},
pages = {165-182},
abstract = {Cocoa is a major cash crop in Cameroon, where its production and export contributes significantly to the national economy and in poverty alleviation. Cocoa-based agroforestry systems (cAFS) have been recognised as a fair strategy for natural resource management, combining both the agricultural and conservation objectives. This study aims to (1) assess the diversity, (2) analyses the floristic and structural characteristics as well as (3) the dendrological features of the (Exploitation Agricole Betti) (EAB), a cAFS vast of 120 ha, located in the East region of Cameroon. Cocoa and associated tree species were counted in 21 sampling plots of 0.25 ha systematicaly settled all over the system (EAB) between 28 August and 22 October 2016. A total number of 3 147 stems was recorded and distributed in 2,599 cocoa trees and 548 associated trees. The overall diversity of the system is low. The density of the cocoa trees is 495.0 stems/ha, correponding to a success rate of 44.6%. The EAB is attacked by the black pod disease. The average Pod Rot Attacked Index (PRAI) is 0.35 ± 0.38; and this varies significantly according to the associated trees density and the season. Further studies should aim to (1) identify different cocoa varieties planted in the system, (2) identify correctly all the pests and diseases of the system, (3) assess the impact of associated tree thinning and cocoa tree Pruning on the pests or diseases attack and on the cocoa production, and (4) to explore the usage of associated trees in the system. This with the view to come out with a fair model cFAS to use in tropical humid forest zones.
Key words: Exploitation Agricole Betti, cocoa, success rate, associated trees, density, stand basal area, dendrological features, Black pod disease, Pod Rot Attacked Index.
},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Cocoa is a major cash crop in Cameroon, where its production and export contributes significantly to the national economy and in poverty alleviation. Cocoa-based agroforestry systems (cAFS) have been recognised as a fair strategy for natural resource management, combining both the agricultural and conservation objectives. This study aims to (1) assess the diversity, (2) analyses the floristic and structural characteristics as well as (3) the dendrological features of the (Exploitation Agricole Betti) (EAB), a cAFS vast of 120 ha, located in the East region of Cameroon. Cocoa and associated tree species were counted in 21 sampling plots of 0.25 ha systematicaly settled all over the system (EAB) between 28 August and 22 October 2016. A total number of 3 147 stems was recorded and distributed in 2,599 cocoa trees and 548 associated trees. The overall diversity of the system is low. The density of the cocoa trees is 495.0 stems/ha, correponding to a success rate of 44.6%. The EAB is attacked by the black pod disease. The average Pod Rot Attacked Index (PRAI) is 0.35 ± 0.38; and this varies significantly according to the associated trees density and the season. Further studies should aim to (1) identify different cocoa varieties planted in the system, (2) identify correctly all the pests and diseases of the system, (3) assess the impact of associated tree thinning and cocoa tree Pruning on the pests or diseases attack and on the cocoa production, and (4) to explore the usage of associated trees in the system. This with the view to come out with a fair model cFAS to use in tropical humid forest zones.
Key words: Exploitation Agricole Betti, cocoa, success rate, associated trees, density, stand basal area, dendrological features, Black pod disease, Pod Rot Attacked Index.
Key words: Exploitation Agricole Betti, cocoa, success rate, associated trees, density, stand basal area, dendrological features, Black pod disease, Pod Rot Attacked Index.
V. Noiha Noumi, Zapfack; Sonke, B.
Eco-biogéographie du genre Peperomia en Afrique: cas de la région Guinéo-Congolaise Article de journal
Dans: International Journal of Environmental Studies, vol. 68, no. 1, p. 43–60, 2021, ISSN: 0020-7233 .
Résumé | Liens | BibTeX | Étiquettes: bassin du Congo, bio-indicateur, Eco-biogéographie, habitat
@article{nokey,
title = {Eco-biogéographie du genre Peperomia en Afrique: cas de la région Guinéo-Congolaise },
author = {Noiha Noumi, V. , Zapfack, L. , Kengne, O. C. , Mokoso, J.D. Mangambu , Ngueguim, J. R. , Tchadji, J. Colince and Sonke, B.},
url = {https://doi.org/10.1080/00207233.2010.520433},
doi = {https://doi.org/10.1080/00207233.2010.520433},
issn = {0020-7233 },
year = {2021},
date = {2021-02-01},
journal = {International Journal of Environmental Studies},
volume = {68},
number = {1},
pages = {43–60},
abstract = {Le principal but de cette étude était d’établir une caractérisation écologique fondamentale du genre. Peperomia pellucida est une espèce terrestre parmi les représentants du genre africain. P. molleri est fortuitement terrestre dans le sous bois. La majorité des espèces sont des épiphytes et constituées essentiellement des herbacées. L’abondance des individus dans les régions basses et moyennes sur le phorophyte montre que la vie est étroitement liée à l’humidité. Les interactions biotiques des espèces épiphytes avec des mousses améliorent leur nutrition hydrique et minérale. L’absence des espèces dans les zones chaudes et leur disparition dans les écosystèmes dégradés approuvent le statut bioindicateur écologique du genre. En dehors de Peperomia pellucida rudérale et absente au-delà de 500 m, les autres espèces sont submontagnardes et montagnardes. Elles sont abondantes entre 1000–2500 m d’altitude. Les espèces sont réparties du Sénégal en Tanzanie avec une abondance remarquable dans les régions de la basse Guinée et du bassin du Congo. Certaines espèces sont plurirégionales tandis que d’autres sont restreintes dans certaines phytochories.},
keywords = {bassin du Congo, bio-indicateur, Eco-biogéographie, habitat},
pubstate = {published},
tppubtype = {article}
}
Le principal but de cette étude était d’établir une caractérisation écologique fondamentale du genre. Peperomia pellucida est une espèce terrestre parmi les représentants du genre africain. P. molleri est fortuitement terrestre dans le sous bois. La majorité des espèces sont des épiphytes et constituées essentiellement des herbacées. L’abondance des individus dans les régions basses et moyennes sur le phorophyte montre que la vie est étroitement liée à l’humidité. Les interactions biotiques des espèces épiphytes avec des mousses améliorent leur nutrition hydrique et minérale. L’absence des espèces dans les zones chaudes et leur disparition dans les écosystèmes dégradés approuvent le statut bioindicateur écologique du genre. En dehors de Peperomia pellucida rudérale et absente au-delà de 500 m, les autres espèces sont submontagnardes et montagnardes. Elles sont abondantes entre 1000–2500 m d’altitude. Les espèces sont réparties du Sénégal en Tanzanie avec une abondance remarquable dans les régions de la basse Guinée et du bassin du Congo. Certaines espèces sont plurirégionales tandis que d’autres sont restreintes dans certaines phytochories.
2020
Kemkeng Ferdinand Betti Jean Lagarde, Ngueguim Jules Romain
Effect of Thinning on Pericopsis elata (Harms) Meeuwen (Fabaceae) Found in Forest Plantations in the East and South Regions of Cameroon Article de journal
Dans: Journal of Plant Studies, vol. 10, no. 1, p. 1-15, 2020, ISSN: 1927-047X.
Résumé | Liens | BibTeX | Étiquettes:
@article{nokey,
title = {Effect of Thinning on Pericopsis elata (Harms) Meeuwen (Fabaceae) Found in Forest Plantations in the East and South Regions of Cameroon},
author = {Betti Jean Lagarde, Kemkeng Ferdinand, Ngueguim Jules Romain, Ambara Joseph, Tchatat Maturin},
url = {https://doi.org/10.5539/jps.v10n1p1},
doi = {10.5539/jps.v10n1p1},
issn = {1927-047X},
year = {2020},
date = {2020-12-20},
journal = {Journal of Plant Studies},
volume = {10},
number = {1},
pages = {1-15},
abstract = {This paper assesses the response of Pericopsis elata trees to silvicultural operations conducted in abandoned plantations settled between 1972 and 1975 in the East and South regions of Cameroon. Trees quality and DBH were evaluated before and 6 years after 2009 thinning. The silvicultural treatment of thinning improved the quality (physiognomy), the annual diameter increment and the stand basal area of trees. The average percentage of winding trees dropped from 82.8% in 2009 before thinning to 44.1%, six years later after thinning (2015). The most important average diameters were observed in thinned plots (27.3 ±10.4 cm - 30.5 ±10.0 cm) compared to non-thinned plots (22.9±13.2 cm-23.3±10.8 cm). Thinned plots gained at least 6 cm in diameter in 6 years, which is trice compared to the 2 cm observed in the non-thinned plots. The average annual diameter increment was 0.45 cm/year in thinned plots against 0.34 cm/year in non-thinned plots in the same period. Thinned plots have gain at least 6 m²/ha in the stand basal area against 1 m²/ha for non-thinned plots. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This paper assesses the response of Pericopsis elata trees to silvicultural operations conducted in abandoned plantations settled between 1972 and 1975 in the East and South regions of Cameroon. Trees quality and DBH were evaluated before and 6 years after 2009 thinning. The silvicultural treatment of thinning improved the quality (physiognomy), the annual diameter increment and the stand basal area of trees. The average percentage of winding trees dropped from 82.8% in 2009 before thinning to 44.1%, six years later after thinning (2015). The most important average diameters were observed in thinned plots (27.3 ±10.4 cm - 30.5 ±10.0 cm) compared to non-thinned plots (22.9±13.2 cm-23.3±10.8 cm). Thinned plots gained at least 6 cm in diameter in 6 years, which is trice compared to the 2 cm observed in the non-thinned plots. The average annual diameter increment was 0.45 cm/year in thinned plots against 0.34 cm/year in non-thinned plots in the same period. Thinned plots have gain at least 6 m²/ha in the stand basal area against 1 m²/ha for non-thinned plots.
Ngueguim, Jules Romain
Edition universitaire Européenne, 2020.
Résumé | Liens | BibTeX | Étiquettes:
@book{nokey,
title = {Foresterie communautaire au Cameroun : Echec ou succès ? Une réponse mitigée Genèse, enjeux, contraintes et perspectives.},
author = {Jules Romain Ngueguim},
editor = { Edition universitaire Européenne},
url = {https://www.amazon.ca/Foreterie-communautaire-Cameroun-contraintes-perspectives/dp/6202544643},
year = {2020},
date = {2020-11-06},
publisher = { Edition universitaire Européenne},
abstract = {La foresterie communautaire arrive au Cameroun à la faveur des actions concertées des bailleurs de fond et dont particulièrement la banque mondiale et le gouvernement du Cameroun. Elle vient mettre fin à la période de super monopole de l’État propriétaire de toutes les ressources forestières, pour ouvrir une nouvelle aire marquée par une gestion décentralisée dans laquelle les communautés sont invitées en plus de leur droit d’usage traditionnelle à participer à l’exploitation durable des ressources naturelles dans un espace d’au plus 5000 ha de leur terroir villageois régit par une convention qui les lie avec l’administration forestière pour une période de 25 années renouvelables. Cette initiative a été accueillie avec faste et a suscité beaucoup d’espoir au sein des communautés rurales. Sa mise en œuvre est un processus dynamique, qui n’a pas toujours produit le succès escompté, au contraire le chemin est ponctué de nombreux écueils, et très régulièrement des textes, décrets et circulaires ont été publiés par les décideurs pour corriger les imperfections et lacunes afin que les objectifs escomptés soient atteints.},
keywords = {},
pubstate = {published},
tppubtype = {book}
}
La foresterie communautaire arrive au Cameroun à la faveur des actions concertées des bailleurs de fond et dont particulièrement la banque mondiale et le gouvernement du Cameroun. Elle vient mettre fin à la période de super monopole de l’État propriétaire de toutes les ressources forestières, pour ouvrir une nouvelle aire marquée par une gestion décentralisée dans laquelle les communautés sont invitées en plus de leur droit d’usage traditionnelle à participer à l’exploitation durable des ressources naturelles dans un espace d’au plus 5000 ha de leur terroir villageois régit par une convention qui les lie avec l’administration forestière pour une période de 25 années renouvelables. Cette initiative a été accueillie avec faste et a suscité beaucoup d’espoir au sein des communautés rurales. Sa mise en œuvre est un processus dynamique, qui n’a pas toujours produit le succès escompté, au contraire le chemin est ponctué de nombreux écueils, et très régulièrement des textes, décrets et circulaires ont été publiés par les décideurs pour corriger les imperfections et lacunes afin que les objectifs escomptés soient atteints.
Betti J.L. Wete E., Ngueguim J. R.
Dans: International Journal of Biological and Chemical Sciences, vol. 14, no. 4, p. 1405-1415, 2020, ISSN: 1997-342X .
Résumé | Liens | BibTeX | Étiquettes:
@article{nokey,
title = {Analyse comparative de la soutenabilité des méthodes d’exploitation de Prunus africana (Hook. f.) Kalkman en vigueur au Cameroun : incidence biologique et socio-économique.},
author = {Wete E., Betti J.L., Ngueguim J.R., Siegfried D. Dibong, Njukouyou N.O.F.},
url = { https://doi.org/10.4314/ijbcs.v14i4.19},
doi = { 10.4314/ijbcs.v14i4.19},
issn = {1997-342X },
year = {2020},
date = {2020-05-07},
journal = {International Journal of Biological and Chemical Sciences},
volume = {14},
number = {4},
pages = {1405-1415},
abstract = {Prunus africana (Hook. f.) Kalkman est une plante de haute valeur médicinale qui connait de forte pression d’exploitation au Mont Cameroun. Dans le cadre d’une récolte durable des écorces, deux méthodes d’exploitation (2/4 et 4/8 opposées) ont été recommandées par l’Agence National de Développement des Forêts (ANAFOR) qui est l’autorité scientifique CITES du Cameroun. Cette étude porte sur l’analyse de la soutenabilité biologique et économique de ces méthodes de récolte en vigueur Cameroun. Un inventaire d’exploitation au taux de sondage de 100% dans une parcelle de 100 ha en fin de première rotation (cycle de 5 années), a servi à la collecte des données sur l’état de santé des arbres (mort, vivant, dépérissant), la mesure des diamètres à hauteur de poitrine et le dénombrement de la population d’arbre. Au total 170 arbres ont été dénombrés, ce qui correspond à 1,7 tiges/ha. Dans cet échantillon on compte 84 arbres (54%) exploités à la méthode 4/8. Ce groupe comprend 23 arbres dépérissant (27,40%), 7 arbres morts (8,30%) et 54 arbres vivants (64,30%). Tandis que sur un effectif de 86 arbres (56%) exploités par la méthode 2/4 on a observé 12 arbres dépérissant (14%), aucun arbre mort et 74 arbres vivants (86%). Ces informations montrent que la méthode d’écorçage (4/8) est plus compromettante sur la croissance des populations d’arbre. Elle est également économiquement la moins rentable avec des pertes de 1650 $US comparée à la méthode 2/4 (660 $). La méthode 2/4 a un faible impact sur la santé des arbres, elle peut être améliorée et adoptée comme méthode de récolte durable qui garantit une cicatrisation rapide de l’écorce des arbres et des revenues importants. Mots clés : Plante médicinale, méthode de récolte durable, régénération, aménagement des ressources forestières, Mont Cameroun.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Prunus africana (Hook. f.) Kalkman est une plante de haute valeur médicinale qui connait de forte pression d’exploitation au Mont Cameroun. Dans le cadre d’une récolte durable des écorces, deux méthodes d’exploitation (2/4 et 4/8 opposées) ont été recommandées par l’Agence National de Développement des Forêts (ANAFOR) qui est l’autorité scientifique CITES du Cameroun. Cette étude porte sur l’analyse de la soutenabilité biologique et économique de ces méthodes de récolte en vigueur Cameroun. Un inventaire d’exploitation au taux de sondage de 100% dans une parcelle de 100 ha en fin de première rotation (cycle de 5 années), a servi à la collecte des données sur l’état de santé des arbres (mort, vivant, dépérissant), la mesure des diamètres à hauteur de poitrine et le dénombrement de la population d’arbre. Au total 170 arbres ont été dénombrés, ce qui correspond à 1,7 tiges/ha. Dans cet échantillon on compte 84 arbres (54%) exploités à la méthode 4/8. Ce groupe comprend 23 arbres dépérissant (27,40%), 7 arbres morts (8,30%) et 54 arbres vivants (64,30%). Tandis que sur un effectif de 86 arbres (56%) exploités par la méthode 2/4 on a observé 12 arbres dépérissant (14%), aucun arbre mort et 74 arbres vivants (86%). Ces informations montrent que la méthode d’écorçage (4/8) est plus compromettante sur la croissance des populations d’arbre. Elle est également économiquement la moins rentable avec des pertes de 1650 $US comparée à la méthode 2/4 (660 $). La méthode 2/4 a un faible impact sur la santé des arbres, elle peut être améliorée et adoptée comme méthode de récolte durable qui garantit une cicatrisation rapide de l’écorce des arbres et des revenues importants. Mots clés : Plante médicinale, méthode de récolte durable, régénération, aménagement des ressources forestières, Mont Cameroun.
2019
Fowe Paul Gustave Kouekam Kengap Arnaud, Togue Kamga Fulbert
Importance des Parametres Hydrodynamiques dans la Repartition Spatiale des Sediments Superficiels des Plages de Limbe (Sud-Ouest Cameroun) Article de journal
Dans: European Scientific Journal, vol. 15, no. 18, p. 270 – 287, 2019, ISSN: 1857- 7431.
@article{nokey,
title = { Importance des Parametres Hydrodynamiques dans la Repartition Spatiale des Sediments Superficiels des Plages de Limbe (Sud-Ouest Cameroun)},
author = {Kouekam Kengap Arnaud, Fowe Paul Gustave, Togue Kamga Fulbert, Ngueguim Jules Romain, Dingong Atoukoh Thérèse Ginette.},
url = {http://dx.doi.org/10.19044/esj.2019.v15n18p270},
doi = {10.19044/esj.2019.v15n18p270},
issn = {1857- 7431},
year = {2019},
date = {2019-06-05},
urldate = {2019-06-05},
journal = {European Scientific Journal},
volume = {15},
number = {18},
pages = {270 – 287},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Bernard Fouadjo Jean Lagarde Betti, Eric Wété; Pouepi, Daniel Tchiyip
Monitoring the harvesting of the barks of Prunus africana (Hook.f.) Kalkman (Rosaceae) in the agroforest systems of North-West region of Cameroon. Article de journal
Dans: International Journal of Agricultural Policy and Research, vol. 7, no. 3, p. 55-69, 2019, ISSN: 2350-1561.
@article{nokey,
title = {Monitoring the harvesting of the barks of Prunus africana (Hook.f.) Kalkman (Rosaceae) in the agroforest systems of North-West region of Cameroon. },
author = {Jean Lagarde Betti, Bernard Fouadjo, Eric Wété, Jules Romain Ngueguim, Oumar Farick Njimbam, Stéphanie Tientcheu and Daniel Tchiyip Pouepi},
url = {https://doi.org/10.15739/IJAPR.19.007},
doi = {10.15739/IJAPR.19.007},
issn = {2350-1561},
year = {2019},
date = {2019-04-13},
journal = {International Journal of Agricultural Policy and Research},
volume = {7},
number = {3},
pages = {55-69},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Marunda C. M.L., Fongnzossie E. F.
Tree germplasm management systems and their potential for sustaining plantation forestry in West and Central Africa Avana-Tientcheu Article de journal
Dans: African Journal of Rural Development, vol. 4, no. 1, p. 33-63, 2019, ISSN: 2415-2838.
@article{nokey,
title = {Tree germplasm management systems and their potential for sustaining plantation forestry in West and Central Africa Avana-Tientcheu},
author = { M.L., Marunda C., Fongnzossie E.F., Kemeuze V.A., Ngueguim J. R., Mutta D.},
url = {https://www.researchgate.net/profile/Marie-Louise-Avana-Tientcheu/publication/346057811_Tree_germplasm_management_systems_and_their_potential_for_sustaining_plantation_forestry_in_West_and_Central_Africa/links/60f19b440859317dbde6fd40/Tree-germplasm-management-systems-and-their-potential-for-sustaining-plantation-forestry-in-West-and-Central-Africa.pdf},
issn = {2415-2838},
year = {2019},
date = {2019-03-16},
journal = {African Journal of Rural Development},
volume = {4},
number = {1},
pages = {33-63},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Nguetsop VF Kamga YB, Anoumaa M
Garcinia Kola (Guttiferae) in Tropical Rain Forests: Exploitation, Income Generation and Traditional Uses, in the East and Central Regions of Cameroon. Article de journal
Dans: Journal of Pharmaceutical, Chemical and Biological Sciences, vol. 7, no. 1, p. 13-27, 2019, ISSN: 2348-7658.
@article{nokey,
title = {Garcinia Kola (Guttiferae) in Tropical Rain Forests: Exploitation, Income Generation and Traditional Uses, in the East and Central Regions of Cameroon.},
author = {Kamga YB, Nguetsop VF, Anoumaa M, Kanmegne G, Momo Solefack MC, Ngueguim JR.},
issn = {2348-7658},
year = {2019},
date = {2019-03-15},
journal = {Journal of Pharmaceutical, Chemical and Biological Sciences},
volume = {7},
number = {1},
pages = {13-27},
abstract = {The present study was aimed to characterize the Garcinia kola populations in the eastern and central regions of Cameroon. To achieve this, 39 plots of 40m x 40m (1600 m2 ) were established in G. kola formations in order to identify and count the unexploited, exploited and dead individuals. An ethnobotanical survey was conducted using pre-established interview forms in different locations where the study was carried out. The percentage of unexploited individuals in Makénéné-Ndikinimeki zones was higher (90.25%) than that of different locations in the eastern region. Moreover, the percentage of exploited and devitalized individuals (62 % and 18% respectively) is high in this region as compared to that of the locations in the centre region. The high rate of death individuals in eastern region is due to the pressure on population, which is linked to the harvesting method (felling and uprooting) observed in this location. This variation of the intensity of the anthropogenic influence can be explained by the accessibility to the growing sites of the species and the closeness or not of these sites to the inhabited areas. Stems, bark, seeds and roots of G. kola are indeed organs used by populations of the East and Centre regions of Cameroon for many purposes (fight against indigestion, impotence, as anti-inflammatory and treatment of stomach ache. This result also shows that, the commercialization of these products in the local markets provides income that contributes to the livelihood of those involved in its trading activities mainly in the centre region. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The present study was aimed to characterize the Garcinia kola populations in the eastern and central regions of Cameroon. To achieve this, 39 plots of 40m x 40m (1600 m2 ) were established in G. kola formations in order to identify and count the unexploited, exploited and dead individuals. An ethnobotanical survey was conducted using pre-established interview forms in different locations where the study was carried out. The percentage of unexploited individuals in Makénéné-Ndikinimeki zones was higher (90.25%) than that of different locations in the eastern region. Moreover, the percentage of exploited and devitalized individuals (62 % and 18% respectively) is high in this region as compared to that of the locations in the centre region. The high rate of death individuals in eastern region is due to the pressure on population, which is linked to the harvesting method (felling and uprooting) observed in this location. This variation of the intensity of the anthropogenic influence can be explained by the accessibility to the growing sites of the species and the closeness or not of these sites to the inhabited areas. Stems, bark, seeds and roots of G. kola are indeed organs used by populations of the East and Centre regions of Cameroon for many purposes (fight against indigestion, impotence, as anti-inflammatory and treatment of stomach ache. This result also shows that, the commercialization of these products in the local markets provides income that contributes to the livelihood of those involved in its trading activities mainly in the centre region.
2018
Jules Romain Ngueguim, Marie Caroline Momo Solefack; Betti, Jean Lagarde
Floristic and structural traits of tree vegetation in three sites with different level of disturbance in dense humid forest of Cameroon. Article de journal
Dans: Journal of Ecology and The Natural Environment, vol. 10, no. 9, p. 239-249, 2018, ISSN: 2006-9847.
Résumé | Liens | BibTeX | Étiquettes:
@article{nokey,
title = {Floristic and structural traits of tree vegetation in three sites with different level of disturbance in dense humid forest of Cameroon.},
author = {Jules Romain Ngueguim, Marie Caroline Momo Solefack and Jean Lagarde Betti},
url = {https://academicjournals.org/journal/JENE/article-full-text-pdf/E7078A359315},
doi = {10.5897/JENE2018.0685},
issn = {2006-9847},
year = {2018},
date = {2018-10-23},
journal = {Journal of Ecology and The Natural Environment},
volume = {10},
number = {9},
pages = {239-249},
abstract = {This study characterizes the floristic and structural traits of trees in three sites of rainforest of Cameroon. The sites were exposed to different intensities of disturbances: Mangombe, highly and frequently disturbed; Bidou, moderately disturbed and Campo, undisturbed. Data collection were carried in a disposive comprising 65 plots of 20 m × 20 m randomly installed in each site for inventory, identification and measurement of diameter of trees greather than 10 cm at 1.30 m height. In total, 4717 plants belonging to 130 species and 43 families were recorded in all the sites. Basal area showed a declining trend with the increase in disturbance intensity while tree density, species richness and families increase with disturbances: Campo (87 m²/ha, 569 trees/ha, 75 species and 29 families); Bidou (54, 538, 88 and 32); Mangombe (49, 708, 91 and 38). The vegetation indices showed a high diversity in all the sites. The Shannon index (5.40 to 5.52) and generic diversity (1.10 to 1.16) had greater value. According to the sample, the floristic composition of Mangombe considerably differs from those of Bidou and Campo. The undisturbed site (Campo) contained young tree population showing a vigorous regeneration while in the highly disturbed site (Mangombe), tree density was scarce, with few big size trees having high cultural importance and low economic value. Low shrub density was recorded in Mangombe and Bidou due to frequent human disturbances. Canopy gaps favor direct sunlight which enhanced the abundance of Shrub in all the sites. More protection is needed for the restoration in the long term of forest cover in Mangombe, which can be done naturally due to high density of small trees composed of species generally found in the upper strata. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This study characterizes the floristic and structural traits of trees in three sites of rainforest of Cameroon. The sites were exposed to different intensities of disturbances: Mangombe, highly and frequently disturbed; Bidou, moderately disturbed and Campo, undisturbed. Data collection were carried in a disposive comprising 65 plots of 20 m × 20 m randomly installed in each site for inventory, identification and measurement of diameter of trees greather than 10 cm at 1.30 m height. In total, 4717 plants belonging to 130 species and 43 families were recorded in all the sites. Basal area showed a declining trend with the increase in disturbance intensity while tree density, species richness and families increase with disturbances: Campo (87 m²/ha, 569 trees/ha, 75 species and 29 families); Bidou (54, 538, 88 and 32); Mangombe (49, 708, 91 and 38). The vegetation indices showed a high diversity in all the sites. The Shannon index (5.40 to 5.52) and generic diversity (1.10 to 1.16) had greater value. According to the sample, the floristic composition of Mangombe considerably differs from those of Bidou and Campo. The undisturbed site (Campo) contained young tree population showing a vigorous regeneration while in the highly disturbed site (Mangombe), tree density was scarce, with few big size trees having high cultural importance and low economic value. Low shrub density was recorded in Mangombe and Bidou due to frequent human disturbances. Canopy gaps favor direct sunlight which enhanced the abundance of Shrub in all the sites. More protection is needed for the restoration in the long term of forest cover in Mangombe, which can be done naturally due to high density of small trees composed of species generally found in the upper strata.
2017
Betti Jean Lagarde Ngueguim Jules Romain, Dicka Kwambe Emmanuel; Félicité., Temgoua Lucie
vol. 9, no. 6, 2017, ISSN: 2006-9847.
Résumé | Liens | BibTeX | Étiquettes:
@proceedings{nokey,
title = {Deforestation, biodiversity and biomass losses in Kribi deep sea port area (Cameroon): Some mitigating measures.},
author = {Ngueguim Jules Romain, Betti Jean Lagarde, Dicka Kwambe Emmanuel, Momo Solefack Marie Caroline and Temgoua Lucie Félicité.},
url = {https://academicjournals.org/journal/JENE/article-full-text-pdf/BA2240364687},
doi = {10.5897/JENE2016.0617},
issn = {2006-9847},
year = {2017},
date = {2017-06-01},
journal = {Journal of Ecology and the Natural Environment.},
volume = {9},
number = {6},
pages = {87-98},
abstract = {This study is part of the environmental impact assessment realised in the deep sea port area of Kribi. Floristic inventory and diversity assessments were necessary to understand the species composition and diversity status of forests, trees biomass and investigate the potential impact of the project. Floristic analysis shows a high Shannon diversity index (5.3), indicating a rich and diverse flora composed of 83 species, 73 genera and 29 families among which one endanger species (Diospyros crassiflora), two lower risk/near threatened species (Dialium bipendense, Irvingia gabonensis) and vulnerable species mostly wood with high marketing value (Afzelia bipindensis, Entandrophragma angolensis, Entandrophragma utile, Khaya ivorensis, Lovoa trichilioïdes, Pterygota macrocarpa). The mean basal area (28 to 50 m²/ha) reflects the presence of patches of disturbed and non disturbed forest with high frequency of small size trees and few canopy trees with large buttresses. Tree biomass is estimated at 2840 Mg (379 Mg/ha) and carbon stock 189.31 MgC/ha. Ecological impact can be mitigating by a management plan which includes a sustainable choice of urbanization and an emphasis on the protection of biodiversity in the remaining forest especially Campo Ma’an national park known as hot spot of biodiversity and where all the censored species can be found. },
keywords = {},
pubstate = {published},
tppubtype = {proceedings}
}
This study is part of the environmental impact assessment realised in the deep sea port area of Kribi. Floristic inventory and diversity assessments were necessary to understand the species composition and diversity status of forests, trees biomass and investigate the potential impact of the project. Floristic analysis shows a high Shannon diversity index (5.3), indicating a rich and diverse flora composed of 83 species, 73 genera and 29 families among which one endanger species (Diospyros crassiflora), two lower risk/near threatened species (Dialium bipendense, Irvingia gabonensis) and vulnerable species mostly wood with high marketing value (Afzelia bipindensis, Entandrophragma angolensis, Entandrophragma utile, Khaya ivorensis, Lovoa trichilioïdes, Pterygota macrocarpa). The mean basal area (28 to 50 m²/ha) reflects the presence of patches of disturbed and non disturbed forest with high frequency of small size trees and few canopy trees with large buttresses. Tree biomass is estimated at 2840 Mg (379 Mg/ha) and carbon stock 189.31 MgC/ha. Ecological impact can be mitigating by a management plan which includes a sustainable choice of urbanization and an emphasis on the protection of biodiversity in the remaining forest especially Campo Ma’an national park known as hot spot of biodiversity and where all the censored species can be found.
Avana M. L. Momo S.M.C., Ngueguim J. R.
Wood characterization of Gnidia glauca (Fresen.) gilg (Thymelaeaceae) and its possible utilization as material for pulp production in Northwest Cameroon Article de journal
Dans: Revue Scientifique et Technique Forêt et Environnement du Bassin du Congo, vol. 8, p. 36-44, 2017.
BibTeX | Étiquettes:
@article{nokey,
title = {Wood characterization of Gnidia glauca (Fresen.) gilg (Thymelaeaceae) and its possible utilization as material for pulp production in Northwest Cameroon},
author = {Momo S.M.C., Avana M. L., Ngueguim J. R., Kemeuze V.A. },
year = {2017},
date = {2017-04-01},
journal = {Revue Scientifique et Technique Forêt et Environnement du Bassin du Congo},
volume = {8},
pages = {36-44},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2016
Temgoua Lucie Félicité Momo Solefack Marie Caroline, Ngueguim Jules Romain; Bernard-Aloys., Nkongmeneck
vol. 8, no. 10, 2016, ISSN: 2006-9847.
@proceedings{nokey,
title = {Comparison of plant communities between primary and secondary tropical forests of Mount Oku, Cameroon. },
author = {Momo Solefack Marie Caroline, Temgoua Lucie Félicité, Ngueguim Jules Romain and Nkongmeneck Bernard-Aloys. },
url = {https://academicjournals.org/journal/JENE/article-full-text-pdf/079049560778},
doi = {10.5897/JENE2016.0598},
issn = {2006-9847},
year = {2016},
date = {2016-10-12},
journal = {Journal of Ecology and The Natural Environment},
volume = {8},
number = {10},
pages = {163-174},
keywords = {},
pubstate = {published},
tppubtype = {proceedings}
}
Louis Zapfack Jules Romain Ngueguim, Jean Michel Onana
Can the Mangombe forest plantation contribute to restore and conserve biodiversity? Article de journal
Dans: International Journal of Biological and Chemical Sciences, vol. 10, no. 1, p. 355-368, 2016, ISSN: 1997-342X .
Résumé | Liens | BibTeX | Étiquettes:
@article{nokey,
title = {Can the Mangombe forest plantation contribute to restore and conserve biodiversity?},
author = {Jules Romain Ngueguim, Louis Zapfack, Jean Michel Onana, Noumi Valery Noiha, Dieudonné Onana, Jean Lagarde Betti, Sophie Gachet, Bernard Riera},
url = {http://dx.doi.org/10.4314/ijbcs.v10i1.27},
doi = {http://dx.doi.org/10.4314/ijbcs.v10i1.27},
issn = {1997-342X },
year = {2016},
date = {2016-02-02},
journal = {International Journal of Biological and Chemical Sciences},
volume = {10},
number = {1},
pages = {355-368},
abstract = {This research, conducted in the tropical rainforest, is focused on restoration of tree diversity through natural regeneration mechanism in the 49 year-old Mangombe forest plantation. 12 plots were surveyed, 6 with large transects and the 6 others under regrowth. In each plot, two subplots with 400 m² each were demarcated for the inventory of all stems with diameter greater than 2.5 cm. A total of 2239 stems comprising 107 species distributed in 93 genera and 42 families were identified over 9600 m². There was a slight difference between species richness of plots with large transect (79 species, 72 genera and 35 families) and regrowth plots (85 species, 76 genera and 38 families) while the basal area in the plots with large transects (10.76 m²/ha) was significantly greater than that of regrowth (8.65 m²/ha). Species with high important value index have an affinity with forest undergrowth such as: Tabernaemontana pachysiphon, T. crassa, Mallotus oppositifolius and Heinsia crinita. The undergrowth is diversified with different life feature and a high number of small size trees indicating a vigorous regeneration. This can be favoured by: microclimate undergrowth, canopy gaps, abundance of litter fall that brings humus to the soil, type and age of plots, planted species and the complexity of spatial and vertical structure of the stand. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This research, conducted in the tropical rainforest, is focused on restoration of tree diversity through natural regeneration mechanism in the 49 year-old Mangombe forest plantation. 12 plots were surveyed, 6 with large transects and the 6 others under regrowth. In each plot, two subplots with 400 m² each were demarcated for the inventory of all stems with diameter greater than 2.5 cm. A total of 2239 stems comprising 107 species distributed in 93 genera and 42 families were identified over 9600 m². There was a slight difference between species richness of plots with large transect (79 species, 72 genera and 35 families) and regrowth plots (85 species, 76 genera and 38 families) while the basal area in the plots with large transects (10.76 m²/ha) was significantly greater than that of regrowth (8.65 m²/ha). Species with high important value index have an affinity with forest undergrowth such as: Tabernaemontana pachysiphon, T. crassa, Mallotus oppositifolius and Heinsia crinita. The undergrowth is diversified with different life feature and a high number of small size trees indicating a vigorous regeneration. This can be favoured by: microclimate undergrowth, canopy gaps, abundance of litter fall that brings humus to the soil, type and age of plots, planted species and the complexity of spatial and vertical structure of the stand.
2015
Zapfack Louis Noiha Noumi Valery, Ngueguim Jules Romain; Marie., Mapongmetsem Pierre
Sequestered Standing Carbon Stock in Selective Exploited Timbers Grown in Tropical Forest: a Case Study from the National Park of Lobeke (Cameroon) Article de journal
Dans: Research & Reviews: Journal of Botanical Sciences, vol. 4, iss. 2, p. 19-24, 2015, ISSN: 2320-0189.
Résumé | Liens | BibTeX | Étiquettes:
@article{nokey,
title = {Sequestered Standing Carbon Stock in Selective Exploited Timbers Grown in Tropical Forest: a Case Study from the National Park of Lobeke (Cameroon)},
author = {Noiha Noumi Valery, Zapfack Louis, Ngueguim Jules Romain, Tabue Mbobda Roger Bruno, Ibrahima Adamou and Mapongmetsem Pierre Marie. },
url = {https://www.researchgate.net/profile/Valery-Noiha-Noumi/publication/282811660_Sequestered_Standing_Carbon_Stock_in_Selective_Exploited_Timbers_Grown_in_Tropical_Forest_a_Case_Study_from_the_National_Park_of_Lobeke_Cameroon/links/561cffed08ae50795afd6f7e/Sequestered-Standing-Carbon-Stock-in-Selective-Exploited-Timbers-Grown-in-Tropical-Forest-a-Case-Study-from-the-National-Park-of-Lobeke-Cameroon.pdf},
issn = {2320-0189},
year = {2015},
date = {2015-09-12},
journal = {Research & Reviews: Journal of Botanical Sciences},
volume = {4},
issue = {2},
pages = {19-24},
abstract = {The study was carried out in the National Park of Lobeke (Cameroon). It aimed to assess diversity and sequestration potential of some commercialized timbers under industrialisation pressure. We took place 37 transects of 5 ha each. All selected timbers of at least 5 cm of DBH were surveyed. 8, 619 individuals divided into 6 families, 6 genera and 9 species were recorded. Diospyros crassiflora (Ebene) was the most diversified species (ISH= 8.09); followed Terminalia superba (Frake; ISH= 2.08). Triplochyton scleroxylon (Ayous), Terminalia superba (Frake) and Entandrophragma cylindricum (Sapelli) were the biggest species of the flora with 549.01; 370.22 and 334.8 m² of basal area respectively. With a stock of carbon evaluated at 107.5 t C/ha, the ecological service from the selected species was estimated at 23,419,305 t of CO2 incorporated in their biomass as from now. In the context of REDD+, the conservation of forests are welcome in mitigating climate change for the humanity welfare.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The study was carried out in the National Park of Lobeke (Cameroon). It aimed to assess diversity and sequestration potential of some commercialized timbers under industrialisation pressure. We took place 37 transects of 5 ha each. All selected timbers of at least 5 cm of DBH were surveyed. 8, 619 individuals divided into 6 families, 6 genera and 9 species were recorded. Diospyros crassiflora (Ebene) was the most diversified species (ISH= 8.09); followed Terminalia superba (Frake; ISH= 2.08). Triplochyton scleroxylon (Ayous), Terminalia superba (Frake) and Entandrophragma cylindricum (Sapelli) were the biggest species of the flora with 549.01; 370.22 and 334.8 m² of basal area respectively. With a stock of carbon evaluated at 107.5 t C/ha, the ecological service from the selected species was estimated at 23,419,305 t of CO2 incorporated in their biomass as from now. In the context of REDD+, the conservation of forests are welcome in mitigating climate change for the humanity welfare.
Benedicta O. Oben Judith G. Makombu, Pius M. Oben; No. 2 Randall E. Brummett. Vol. 7, p. 68-80
Biodiversity of species of genus: Macrobrachium (Decapoda, Palaemonidae) in Lokoundje, Kienke and Lobe Rivers of South Region, Cameroon Article de journal
Dans: Journal of Biodiversity and Environmental Sciences, vol. 7, no. 2, p. 68-80, 2015, ISSN: 2222-3045.
BibTeX | Étiquettes:
@article{nokey,
title = {Biodiversity of species of genus: Macrobrachium (Decapoda, Palaemonidae) in Lokoundje, Kienke and Lobe Rivers of South Region, Cameroon},
author = {Judith G. Makombu, Benedicta O. Oben, Pius M. Oben, Ndelle Makoge, Elie W. Nguekam, Guillaume L.P. Gaudin, Isabelle S. Motto, Koffi M. Konan, Janet H. Brown, Jules R. Ngueguim, Eric Mialhe and Randall E. Brummett. Vol. 7, No. 2, p. 68-80, 2015},
issn = {2222-3045},
year = {2015},
date = {2015-08-10},
journal = {Journal of Biodiversity and Environmental Sciences},
volume = {7},
number = {2},
pages = {68-80},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Nicole Marie Guedje Mouamfon Mama, Issofa Pepainyiene
Pentaclethra macrophylla Benth. dans la forêt communautaire de Payo (EstCameroun): inventaire, productivité et commercialisation. Article de journal
Dans: International Journal of Biological and Chemical Sciences, vol. 9, no. 1, p. 200-216, 2015, ISBN: 1997-342X .
Résumé | Liens | BibTeX | Étiquettes: commercialisation, forêt communautaire, Pentaclethra macrophylla, Production
@article{nokey,
title = {Pentaclethra macrophylla Benth. dans la forêt communautaire de Payo (EstCameroun): inventaire, productivité et commercialisation.},
author = {Mouamfon Mama, Nicole Marie Guedje, Issofa Pepainyiene, Louis Zapfack, Jules Romain Ngueguim et Jean Lejoly},
url = {https://doi.org/10.4314/ijbcs.v9i1.18},
doi = {https://doi.org/10.4314/ijbcs.v9i1.18},
isbn = {1997-342X },
year = {2015},
date = {2015-02-05},
journal = {International Journal of Biological and Chemical Sciences},
volume = {9},
number = {1},
pages = {200-216},
abstract = {Cette étude a été conduite à l’Est du Cameroun, dans la forêt communautaire de Payo. Elle a pour objet d’évaluer l’importance écologique, productive et socioéconomique de P. macrophylla. Le dispositif d’inventaire est constitué de quatre transects de 40 m x 2000 m2 (8 ha chacun) avec un taux de sondage de 2%. Toutes les tiges de diamètre à hauteur de poitrine ≥10 cm ont été marquées, géoreferencées, comptées et leur diamètre mesurés à la hauteur 1,30 cm. Les observations et entretiens, ainsi que le suivi de la filière de commercialisation ont été réalisés à Payo puis dans la ville de Lomié. L’espèce est abondante dans les forêts secondaires jeunes avec une densité de 6 tiges/ha. Le diamètre moyen et la surface terrière des tiges recensées sont respectivement estimés à 56,91 ± 14 cm et 19,46 m²/ha. L’indice de régénération naturelle est évalué à 4,8 et influencé par l’intensité lumineuse qui parvient dans le sous-bois. La production de 35 arbres pour une saison de fructification est estimée à 5 157 graines soit en moyenne 147,34 graines/arbre. La production annuelle est estimée à 1 261 255 graines équivalant à 11 571 combos (unité de mesure locale). La valeur marchande de ces graines est estimée à 5 785 572 Frs CFA (11836 $US). L’exploitation des graines de P. macrophylla représente ainsi de bonnes perspectives de revenus pour cette localité. },
keywords = {commercialisation, forêt communautaire, Pentaclethra macrophylla, Production},
pubstate = {published},
tppubtype = {article}
}
Cette étude a été conduite à l’Est du Cameroun, dans la forêt communautaire de Payo. Elle a pour objet d’évaluer l’importance écologique, productive et socioéconomique de P. macrophylla. Le dispositif d’inventaire est constitué de quatre transects de 40 m x 2000 m2 (8 ha chacun) avec un taux de sondage de 2%. Toutes les tiges de diamètre à hauteur de poitrine ≥10 cm ont été marquées, géoreferencées, comptées et leur diamètre mesurés à la hauteur 1,30 cm. Les observations et entretiens, ainsi que le suivi de la filière de commercialisation ont été réalisés à Payo puis dans la ville de Lomié. L’espèce est abondante dans les forêts secondaires jeunes avec une densité de 6 tiges/ha. Le diamètre moyen et la surface terrière des tiges recensées sont respectivement estimés à 56,91 ± 14 cm et 19,46 m²/ha. L’indice de régénération naturelle est évalué à 4,8 et influencé par l’intensité lumineuse qui parvient dans le sous-bois. La production de 35 arbres pour une saison de fructification est estimée à 5 157 graines soit en moyenne 147,34 graines/arbre. La production annuelle est estimée à 1 261 255 graines équivalant à 11 571 combos (unité de mesure locale). La valeur marchande de ces graines est estimée à 5 785 572 Frs CFA (11836 $US). L’exploitation des graines de P. macrophylla représente ainsi de bonnes perspectives de revenus pour cette localité.
2014
Pius M. Oben Judith G. Makombu, Benedicta O. Oben; Eric Mialhe., 26:310–328. 67 – 80pp.
Complete Larval Development of the Fresh Water Prawn Macrobrachium vollenhovenii in Cameroon. Article de journal
Dans: Journal of Applied Aquaculture, p. 310-328, 2014.
@article{nokey,
title = {Complete Larval Development of the Fresh Water Prawn Macrobrachium vollenhovenii in Cameroon.},
author = {Judith G. Makombu, Pius M. Oben, Benedicta O. Oben, Guillaume L. P. Gaudin, Isabelle S. Motto, Ndelle Makoge, Jonas K. Syapze, Janet H. Brown, Jules R. Ngueguim, and Eric Mialhe. , 26:310–328. 67 – 80pp.},
url = {https://doi.org/10.1080/10454438.2014.934170},
doi = {10.1080/10454438.2014.934170},
year = {2014},
date = {2014-11-07},
journal = {Journal of Applied Aquaculture},
pages = {310-328},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2012
J. L. Betti J. R. Ngueguim, B. Riera
Growth and productivity of Pericopsis elata (Harms) Meeuwen in some forest plantations of Cameroon, Forest Science and Technology Article de journal
Dans: Forest Science and Technology, vol. 8, no. 1, p. 1-10, 2012, ISSN: 2158-0715.
Résumé | Liens | BibTeX | Étiquettes:
@article{nokey,
title = {Growth and productivity of Pericopsis elata (Harms) Meeuwen in some forest plantations of Cameroon, Forest Science and Technology},
author = {J. R. Ngueguim, J. L. Betti, B. Riera, J. Ambara, M. Tchatat, J. Onana},
url = {https://www.tandfonline.com/loi/tfst20},
doi = {10.1080/21580103.2012.658234},
issn = {2158-0715},
year = {2012},
date = {2012-02-21},
journal = {Forest Science and Technology},
volume = {8},
number = {1},
pages = {1-10},
abstract = {Pericopsis elata is a timber tree with a high commercial value used as hardwood in the Congo basin forest. It is considered a threatened species by the International Union for Conservation of Nature (IUCN) and classified in 1992 in the annex II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). The natural regeneration of P. elata is problematic; an increase in knowledge concerning its ecology, productivity, and potentials could significantly contribute to the sustainable exploitation of the species and improve its silviculture. Despite the irregularity of silvicultural treatment, Kienke south and Ndeng ndeng plantation, respectively situated in the south and east region of Cameroon, show acceptable survival rates. These rates are estimated at 91% in parcel P75 planted at 884 stems/ha and 69% in parcel P746 with a density of 192 stems/ha. Tree mortalities were mainly attributed to edaphic and climatic factors. The best performances of tree diameter growth were observed in parcel P741 and P73 where the mean diameters at breast height of trees were 27+18 cm and 24 +11 cm. The higher values of standard deviation showed a strong variability within tree diameter in the parcels. In P741, the mean annual growth decreased from 1.40 cm/year to 0.7 cm/year between 1979 and 2009. The tree diameter structures of the plantations are asymmetric with a very high slope before the modal class expressing the difficulties of the growth of individuals with diameter lower than 10 cm. The production of wood was estimated at 1326.6 +70 m3 for trees with more than 30 cm diameter. The plantations are situated out of the natural and geographical area of the species; this can justify the low performances of trees growth. The survey of these plantations and silvicultural treatments could contribute to increasing tree growth. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Pericopsis elata is a timber tree with a high commercial value used as hardwood in the Congo basin forest. It is considered a threatened species by the International Union for Conservation of Nature (IUCN) and classified in 1992 in the annex II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). The natural regeneration of P. elata is problematic; an increase in knowledge concerning its ecology, productivity, and potentials could significantly contribute to the sustainable exploitation of the species and improve its silviculture. Despite the irregularity of silvicultural treatment, Kienke south and Ndeng ndeng plantation, respectively situated in the south and east region of Cameroon, show acceptable survival rates. These rates are estimated at 91% in parcel P75 planted at 884 stems/ha and 69% in parcel P746 with a density of 192 stems/ha. Tree mortalities were mainly attributed to edaphic and climatic factors. The best performances of tree diameter growth were observed in parcel P741 and P73 where the mean diameters at breast height of trees were 27+18 cm and 24 +11 cm. The higher values of standard deviation showed a strong variability within tree diameter in the parcels. In P741, the mean annual growth decreased from 1.40 cm/year to 0.7 cm/year between 1979 and 2009. The tree diameter structures of the plantations are asymmetric with a very high slope before the modal class expressing the difficulties of the growth of individuals with diameter lower than 10 cm. The production of wood was estimated at 1326.6 +70 m3 for trees with more than 30 cm diameter. The plantations are situated out of the natural and geographical area of the species; this can justify the low performances of trees growth. The survey of these plantations and silvicultural treatments could contribute to increasing tree growth.
2011
J.P. Dondjang Jules Ngueguim, J. Onana
Moabi (Baillonella toxisperma Pierre) : arbre à usage multiple de forêt dense humide du Cameroun Article de journal
Dans: International Journal of Biological and Chemical Sciences, vol. 5, no. 6, p. 2395-2406, 2011, ISSN: 1991-8631.
Résumé | Liens | BibTeX | Étiquettes: Cameroun, forêt dense humide, Moabi
@article{nokey,
title = {Moabi (Baillonella toxisperma Pierre) : arbre à usage multiple de forêt dense humide du Cameroun },
author = {Jules Ngueguim, J.P. Dondjang, J. Onana, P. Tata Ijang, L. Zapfack, V. Noiha Noumi, O.C. Kengne et C. Momo Solefack. },
url = {https://www.ajol.info/index.php/ijbcs/article/view/77257},
doi = {10.4314/ijbcs.v5i6.19},
issn = {1991-8631},
year = {2011},
date = {2011-12-01},
urldate = {2011-12-01},
journal = {International Journal of Biological and Chemical Sciences},
volume = {5},
number = {6},
pages = {2395-2406},
abstract = {Le Moabi est un grand arbre de la forêt dense humide du Cameroun. Cet arbre à usages multiples, est recherché par l’industrie forestière pour la qualité de son bois et par les populations rurales pour ses produits autres que le bois tels l’écorce et les racines pour leurs importances médicinales, les fruits pour la fabrication d’huile. Ces formes d’exploitations concurrentielles, très souvent sans soucis de durabilité ont considérablement réduit les populations d’arbres, avec pour conséquence la rareté des produits dérivés. Face à cette forte pression anthropique qui s’exerce sur le Moabi dans le sud Cameroun, il a paru nécessaire d’effectuer une étude socioéconomique et écologique dans les villages à fortes activités d’exploitation. En effet, la compréhension des atouts socioculturels et des divers liens et usages que les ruraux tissent autour de cet arbre, l’estimation des stocks disponibles dans les terroirs villageois est un préalable impératif à l’élaboration des règles de gestion durable. Les enquêtes auprès des utilisateurs et les inventaires forestiers ont été réalisés dans sept villages. La distribution de cette espèce est estimée à 0,8 arbre/ha pour les individus d’un diamètre à 1,3 m supérieur à 10 cm. Cet arbre revêt une importance socioculturelle et incarne des pouvoirs divins indéniables pour 65% des ruraux. Les femmes représentent 56,5% des exploitants des produits forestiers non ligneux issus de cet arbre. Elles sont plus que les hommes, tributaires de l’exploitation des fruits et des écorces du Moabi. De ce fait, elles sont les principales victimes des conflits d’intérêts. Les écorces et le latex sont utilisés en pharmacopée. La production d’huile à partir des fruits peut générer jusque 1 050 000 Fcfa de rentrées financières dans le village Melondo. L’importance de ce gain incite à promouvoir l’extraction d’huile de Moabi dans le cadre de la diversification des sources de revenus et de la lutte contre la pauvreté. },
keywords = {Cameroun, forêt dense humide, Moabi},
pubstate = {published},
tppubtype = {article}
}
Le Moabi est un grand arbre de la forêt dense humide du Cameroun. Cet arbre à usages multiples, est recherché par l’industrie forestière pour la qualité de son bois et par les populations rurales pour ses produits autres que le bois tels l’écorce et les racines pour leurs importances médicinales, les fruits pour la fabrication d’huile. Ces formes d’exploitations concurrentielles, très souvent sans soucis de durabilité ont considérablement réduit les populations d’arbres, avec pour conséquence la rareté des produits dérivés. Face à cette forte pression anthropique qui s’exerce sur le Moabi dans le sud Cameroun, il a paru nécessaire d’effectuer une étude socioéconomique et écologique dans les villages à fortes activités d’exploitation. En effet, la compréhension des atouts socioculturels et des divers liens et usages que les ruraux tissent autour de cet arbre, l’estimation des stocks disponibles dans les terroirs villageois est un préalable impératif à l’élaboration des règles de gestion durable. Les enquêtes auprès des utilisateurs et les inventaires forestiers ont été réalisés dans sept villages. La distribution de cette espèce est estimée à 0,8 arbre/ha pour les individus d’un diamètre à 1,3 m supérieur à 10 cm. Cet arbre revêt une importance socioculturelle et incarne des pouvoirs divins indéniables pour 65% des ruraux. Les femmes représentent 56,5% des exploitants des produits forestiers non ligneux issus de cet arbre. Elles sont plus que les hommes, tributaires de l’exploitation des fruits et des écorces du Moabi. De ce fait, elles sont les principales victimes des conflits d’intérêts. Les écorces et le latex sont utilisés en pharmacopée. La production d’huile à partir des fruits peut générer jusque 1 050 000 Fcfa de rentrées financières dans le village Melondo. L’importance de ce gain incite à promouvoir l’extraction d’huile de Moabi dans le cadre de la diversification des sources de revenus et de la lutte contre la pauvreté.
Sven Walter Tata Precillia Ijang, Ngueguim Jules. R.
vol. 4, no. 1, 2011, ISSN: 1979-2611.
Résumé | Liens | BibTeX | Étiquettes:
@proceedings{nokey,
title = {An overview of policy and institutional frameworks impacting the use of Non Timber Forest Products in central Africa},
author = {Tata Precillia Ijang, Sven Walter, Ngueguim Jules. R.},
url = {http://www.ijsf.org/dat/art/vol04/ijsf_vol4_no1_04_tata_ijang_ntfp_central_africa.pdf},
issn = {1979-2611},
year = {2011},
date = {2011-06-01},
journal = {International Journal of Social Forestry},
volume = {4},
number = {1},
pages = {64-85},
abstract = {This study describes an exploratory data gathering process aimed at constructing a rudimentary image of non timber forest products (NTFP) in national, regional and international policy processes. Primary data was collected through guided interviews and informal discussions. Respondents surveyed included various ministry officials and representatives of the private sector in Cameroon and the Democratic Republic of Congo (DRC) as well as knowledgeable experts on the subject matter. Secondary data was also collected through internet searches and document analysis. The results of this study are intended to prompt policy and decision makers to question and reaffirm the place of NTFPs within overall policy and institutional processes as well as throw some light on where NTFPs may fit within these policies and institutions. Generally, in Central African states, there exist no specific rules and policies for NTFPs. Nonetheless, policies affecting NTFPs are inferred across a wide range of forestry, financial, agricultural, cultural, pharmaceutical and commercial domains. For edible NTFP, food security, health, sanitary and phytosanitary policies are usually applicable. Policies on sustainable development and environmental management also influence NTFPs directly and indirectly. At the international level, policies affecting NTFPs are generally preoccupied with climates and ecosystem conditions, the conservation of endangered species and assurance of balance of trade between countries. These policies articulate around the Millennium Development Goals in which NTFPs could contribute to the realization of goals 1, 7 and 8. At the regional level, NTFP policies are oriented towards the better management of trans-boundary forest resources to ensure equitable and rational benefit sharing from forest resources between participating countries, protection of national territory and maintenance of peace within the sub region. These policies articulate around the Commission of Central Africa Forest (COMIFAC) initiative.},
keywords = {},
pubstate = {published},
tppubtype = {proceedings}
}
This study describes an exploratory data gathering process aimed at constructing a rudimentary image of non timber forest products (NTFP) in national, regional and international policy processes. Primary data was collected through guided interviews and informal discussions. Respondents surveyed included various ministry officials and representatives of the private sector in Cameroon and the Democratic Republic of Congo (DRC) as well as knowledgeable experts on the subject matter. Secondary data was also collected through internet searches and document analysis. The results of this study are intended to prompt policy and decision makers to question and reaffirm the place of NTFPs within overall policy and institutional processes as well as throw some light on where NTFPs may fit within these policies and institutions. Generally, in Central African states, there exist no specific rules and policies for NTFPs. Nonetheless, policies affecting NTFPs are inferred across a wide range of forestry, financial, agricultural, cultural, pharmaceutical and commercial domains. For edible NTFP, food security, health, sanitary and phytosanitary policies are usually applicable. Policies on sustainable development and environmental management also influence NTFPs directly and indirectly. At the international level, policies affecting NTFPs are generally preoccupied with climates and ecosystem conditions, the conservation of endangered species and assurance of balance of trade between countries. These policies articulate around the Millennium Development Goals in which NTFPs could contribute to the realization of goals 1, 7 and 8. At the regional level, NTFP policies are oriented towards the better management of trans-boundary forest resources to ensure equitable and rational benefit sharing from forest resources between participating countries, protection of national territory and maintenance of peace within the sub region. These policies articulate around the Commission of Central Africa Forest (COMIFAC) initiative.
2009
Louis Zapfack Jules Romain Ngueguim, Emmanuel Youmbi
Diversité floristique sous canopée en plantation forestière de Mangombe-Edea (Cameroun) Article de journal
Dans: Biotechnologie, Agronomie, Société et Environnement/Biotechnology, Agronomy, Society and Environment, iss. 14, no. 1, p. 167-176, 2009, ISBN: 1370-6233.
Résumé | Liens | BibTeX | Étiquettes:
@article{nokey,
title = {Diversité floristique sous canopée en plantation forestière de Mangombe-Edea (Cameroun)},
author = {Jules Romain Ngueguim, Louis Zapfack, Emmanuel Youmbi, Bernard Riera, Joseph Onana, Bernard Foahom, Judith G. Makombu.},
url = {https://popups.uliege.be/1780-4507/index.php?id=5229},
isbn = {1370-6233},
year = {2009},
date = {2009-09-11},
journal = {Biotechnologie, Agronomie, Société et Environnement/Biotechnology, Agronomy, Society and Environment},
number = {1},
issue = {14},
pages = {167-176},
abstract = {La plantation d’arbres de Mangombé se trouve en forêt dense humide de basse altitude. Six parcelles dans ce site, dont une
de Mansonia altissima (A.Chev.) A.Chev., deux de Lovoa trichilioides Harms, trois de Terminalia ivorensis A.Chev. et une
forêt naturelle perturbée, ont fait l’objet d’une étude floristique. Le travail consiste en l’évaluation de la diversité floristique
du sous-bois en vue d’apprécier l’incidence des plantations forestières sur la régénération naturelle. Au total, 26 familles,
42 genres et 46 espèces ont été recensés. Les Meliaceae et Apocynaceae forment le fonds floristique. Dans la parcelle 1 de
T. ivorensis, M. altissima et la forêt naturelle, la faible valeur de l’équitabilité de Piélou traduit la dominance des effectifs par
quelques espèces et la situation transitoire de l’écosystème. Par contre, le reste des parcelles présente une bonne répartition
des individus au sein des espèces. On note une faible organisation du système écologique dans la parcelle de M. altissima, ce
qui correspond à des conditions du milieu favorables à l’installation de nombreuses espèces représentées par un petit nombre
d’individus. L’indice de Shannon relativement faible dans la parcelle 1 de Terminalia ivorensis caractérise un peuplement où
une espèce est dominante. Globalement, le sous-bois des parcelles se reconstitue progressivement et reste moins diversifié que
la forêt naturelle environnante. La création d’un pool génétique au moyen d’entretiens sélectifs du sous-bois permettra une
gestion polycyclique des parcelles dans le cadre de la production continue du bois.
Mots-clés. Biodiversité, régénération naturelle, écologie forestière, forêt dense humide, Cameroun.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
La plantation d’arbres de Mangombé se trouve en forêt dense humide de basse altitude. Six parcelles dans ce site, dont une
de Mansonia altissima (A.Chev.) A.Chev., deux de Lovoa trichilioides Harms, trois de Terminalia ivorensis A.Chev. et une
forêt naturelle perturbée, ont fait l’objet d’une étude floristique. Le travail consiste en l’évaluation de la diversité floristique
du sous-bois en vue d’apprécier l’incidence des plantations forestières sur la régénération naturelle. Au total, 26 familles,
42 genres et 46 espèces ont été recensés. Les Meliaceae et Apocynaceae forment le fonds floristique. Dans la parcelle 1 de
T. ivorensis, M. altissima et la forêt naturelle, la faible valeur de l’équitabilité de Piélou traduit la dominance des effectifs par
quelques espèces et la situation transitoire de l’écosystème. Par contre, le reste des parcelles présente une bonne répartition
des individus au sein des espèces. On note une faible organisation du système écologique dans la parcelle de M. altissima, ce
qui correspond à des conditions du milieu favorables à l’installation de nombreuses espèces représentées par un petit nombre
d’individus. L’indice de Shannon relativement faible dans la parcelle 1 de Terminalia ivorensis caractérise un peuplement où
une espèce est dominante. Globalement, le sous-bois des parcelles se reconstitue progressivement et reste moins diversifié que
la forêt naturelle environnante. La création d’un pool génétique au moyen d’entretiens sélectifs du sous-bois permettra une
gestion polycyclique des parcelles dans le cadre de la production continue du bois.
Mots-clés. Biodiversité, régénération naturelle, écologie forestière, forêt dense humide, Cameroun.
de Mansonia altissima (A.Chev.) A.Chev., deux de Lovoa trichilioides Harms, trois de Terminalia ivorensis A.Chev. et une
forêt naturelle perturbée, ont fait l’objet d’une étude floristique. Le travail consiste en l’évaluation de la diversité floristique
du sous-bois en vue d’apprécier l’incidence des plantations forestières sur la régénération naturelle. Au total, 26 familles,
42 genres et 46 espèces ont été recensés. Les Meliaceae et Apocynaceae forment le fonds floristique. Dans la parcelle 1 de
T. ivorensis, M. altissima et la forêt naturelle, la faible valeur de l’équitabilité de Piélou traduit la dominance des effectifs par
quelques espèces et la situation transitoire de l’écosystème. Par contre, le reste des parcelles présente une bonne répartition
des individus au sein des espèces. On note une faible organisation du système écologique dans la parcelle de M. altissima, ce
qui correspond à des conditions du milieu favorables à l’installation de nombreuses espèces représentées par un petit nombre
d’individus. L’indice de Shannon relativement faible dans la parcelle 1 de Terminalia ivorensis caractérise un peuplement où
une espèce est dominante. Globalement, le sous-bois des parcelles se reconstitue progressivement et reste moins diversifié que
la forêt naturelle environnante. La création d’un pool génétique au moyen d’entretiens sélectifs du sous-bois permettra une
gestion polycyclique des parcelles dans le cadre de la production continue du bois.
Mots-clés. Biodiversité, régénération naturelle, écologie forestière, forêt dense humide, Cameroun.
0000
Hilaire CHOKONA GATCHUI Jules R. NGUEGUIM, Salami T. AYOBAMI; ORIMOOGUNJE., O. O.
Evaluation of logging impacts on tropical rainforest in Eastern Cameroon using Remote Sensing and GIS techniques Article de journal
Dans: International Journal of Biological and Chemical Sciences, vol. 3, no. 4, p. 771-785, 0000, ISSN: 1991-8631.
Résumé | Liens | BibTeX | Étiquettes: forest fragmentation, Forest Management Unit (FMU), GIS, logging impact, logging road, Remote sensing
@article{nokey,
title = {Evaluation of logging impacts on tropical rainforest in Eastern Cameroon using Remote Sensing and GIS techniques },
author = {Jules R. NGUEGUIM, Hilaire CHOKONA GATCHUI, Salami T. AYOBAMI and O. O. ORIMOOGUNJE. },
url = {http://ajol.info/index.php/ijbcs},
doi = {10.4314/ijbcs.v3i4.47163},
issn = {1991-8631},
journal = {International Journal of Biological and Chemical Sciences},
volume = {3},
number = {4},
pages = {771-785},
abstract = {Various strategies and techniques have been designed and implemented to study the effects of logging activities on tropical rainforest amongst which remote sensing and GIS analysis. But there are still few measures available on the effects of industrial timber on forest ecosystem. This paper examined the impact of logging activities on tropical rainforest in Eastern Cameroon with the objectives of demonstrating the process whereby tropical rainforest got transformed into forest fragmentation and canopy damage. The study made use of data generated from Landsat TM (1986) and Landsat ETM + (2000). The satellites images covering the area were analysed using the Maximum Likelihood algorithm. The observed changes were mapped and the results of the classification were prepared as different theme in GIS software. The classification results reveal a canopy damage of 10.8%, the construction of 109.224 km of road and the fragmentation of forest into 18 parts. },
keywords = {forest fragmentation, Forest Management Unit (FMU), GIS, logging impact, logging road, Remote sensing},
pubstate = {published},
tppubtype = {article}
}
Various strategies and techniques have been designed and implemented to study the effects of logging activities on tropical rainforest amongst which remote sensing and GIS analysis. But there are still few measures available on the effects of industrial timber on forest ecosystem. This paper examined the impact of logging activities on tropical rainforest in Eastern Cameroon with the objectives of demonstrating the process whereby tropical rainforest got transformed into forest fragmentation and canopy damage. The study made use of data generated from Landsat TM (1986) and Landsat ETM + (2000). The satellites images covering the area were analysed using the Maximum Likelihood algorithm. The observed changes were mapped and the results of the classification were prepared as different theme in GIS software. The classification results reveal a canopy damage of 10.8%, the construction of 109.224 km of road and the fragmentation of forest into 18 parts.
Louis Zapfack Jules Romain Ngueguim, Noumi Valery Noiha
Expériences sylvicoles au Cameroun : Croissance, mortalité et adaptabilité des espèces de bois d’œuvre dans la station forestière de Mangombé (1964 - 2010) Article de journal
Dans: International Journal of Biological and Chemical Sciences, vol. 9, no. 6, p. 2789-2807, 0000, ISBN: 1997-342X .
Résumé | Liens | BibTeX | Étiquettes:
@article{nokey,
title = {Expériences sylvicoles au Cameroun : Croissance, mortalité et adaptabilité des espèces de bois d’œuvre dans la station forestière de Mangombé (1964 - 2010)},
author = {Jules Romain Ngueguim, Louis Zapfack, Noumi Valery Noiha, Dieudonné Onana, Jean Lagarde Betti et Bernard Riera. Int. J. Biol. Chem. Sci. 9(6): .},
url = { http://dx.doi.org/10.4314/ijbcs.v9i6.22},
doi = {10.4314/ijbcs.v9i6.22},
isbn = {1997-342X },
journal = {International Journal of Biological and Chemical Sciences},
volume = {9},
number = {6},
pages = {2789-2807},
abstract = {Au Cameroun, l’exploitation du bois a entraîné la réduction du couvert forestier et son appauvrissement en espèces de bois d’œuvre. Pour remédier à cette situation, de nombreuses plantations forestières ont été crées, puis abandonnées quelques décennies plus tard pour des raisons diverses, ce qui n’a pas permis de capitaliser l’ensemble des connaissances sylvicoles escomptées qui devaient permettre de réhabiliter les forêts et limiter les risques d’épuisement des stocks d’essences commerciales. Le dispositif sylvicole de Mangombé fait partie de ces initiatives, il ne compte plus que 27 parcelles d’arbres constituées de 15 espèces sur une quarantaine plantées. Ce travail, présente l’état de cette station forestière à travers l’étude de la croissance, de la mortalité des arbres et de l’adaptabilité des espèces. Dans chaque parcelle, toutes les tiges ont été inventoriées et leur diamètre à 1,30 m mesurés. Ce paramètre a permis d’établir la structure de population et d’apprécier la possible rentabilité économique des espèces. Les meilleures performances de croissance des arbres sont obtenues chez Gmelina arborea Roxb. (Gme-1 : 56 m²/ha) ; Araucaria cunninghamii Aiton ex D. Don (Ara-1 : 63 m²/ha) et Aucoumea klaineana Pierre (Auc-3 : 80 m²/ha). Les valeurs élevées des écarts types indiquent une croissance disproportionnée des individus à l’intérieur des parcelles. Les espèces présentant une faible mortalité et une proportion importante de tiges exploitées ainsi que de bonnes caractéristiques de croissance comme G. arborea, Dipterocarpus alatus Roxb. ex G. Don. (51 m²/ha) et A. klaineana se sont mieux adaptées au site de plantation et peuvent être recommandées pour les initiatives de reboisement dans la zone. La faible production observée chez un nombre élevé d’espèces est économiquement non rentable au regard des investissements onéreux consentis à la mise en place de la plantation. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Au Cameroun, l’exploitation du bois a entraîné la réduction du couvert forestier et son appauvrissement en espèces de bois d’œuvre. Pour remédier à cette situation, de nombreuses plantations forestières ont été crées, puis abandonnées quelques décennies plus tard pour des raisons diverses, ce qui n’a pas permis de capitaliser l’ensemble des connaissances sylvicoles escomptées qui devaient permettre de réhabiliter les forêts et limiter les risques d’épuisement des stocks d’essences commerciales. Le dispositif sylvicole de Mangombé fait partie de ces initiatives, il ne compte plus que 27 parcelles d’arbres constituées de 15 espèces sur une quarantaine plantées. Ce travail, présente l’état de cette station forestière à travers l’étude de la croissance, de la mortalité des arbres et de l’adaptabilité des espèces. Dans chaque parcelle, toutes les tiges ont été inventoriées et leur diamètre à 1,30 m mesurés. Ce paramètre a permis d’établir la structure de population et d’apprécier la possible rentabilité économique des espèces. Les meilleures performances de croissance des arbres sont obtenues chez Gmelina arborea Roxb. (Gme-1 : 56 m²/ha) ; Araucaria cunninghamii Aiton ex D. Don (Ara-1 : 63 m²/ha) et Aucoumea klaineana Pierre (Auc-3 : 80 m²/ha). Les valeurs élevées des écarts types indiquent une croissance disproportionnée des individus à l’intérieur des parcelles. Les espèces présentant une faible mortalité et une proportion importante de tiges exploitées ainsi que de bonnes caractéristiques de croissance comme G. arborea, Dipterocarpus alatus Roxb. ex G. Don. (51 m²/ha) et A. klaineana se sont mieux adaptées au site de plantation et peuvent être recommandées pour les initiatives de reboisement dans la zone. La faible production observée chez un nombre élevé d’espèces est économiquement non rentable au regard des investissements onéreux consentis à la mise en place de la plantation.
Jules Romain Ngueguim Jean Lagarde Betti, Ferdinand Kemkeng; 82., Louis Zapfack. 2017. Vol. 7(2): 71 –
Response of Pericopsis elata (Harms) Meeuwen to sylvicultural treatments in some forest plantations of Cameroon. Article de journal
Dans: Agricultural Science Research Journal, vol. 7, no. 2, p. 71-82, 0000.
@article{nokey,
title = {Response of Pericopsis elata (Harms) Meeuwen to sylvicultural treatments in some forest plantations of Cameroon.},
author = {Jean Lagarde Betti, Jules Romain Ngueguim, Ferdinand Kemkeng , Joseph Ambara, Maturin Tchatat and Louis Zapfack. 2017. Vol. 7(2): 71 – 82.},
journal = {Agricultural Science Research Journal},
volume = {7},
number = {2},
pages = {71-82},
abstract = {A study for analysing the response of Pericopsis elata on sylvicultural treatment consisting of pruning was conducted in abandoned plantations settled between 1972 and 1975 in the East and South regions of Cameroon. Inventory was conducted in two phases: phase I from 12th April to 13th June 2009 before the first sylvicultural treatment occurred in September 2009 and phase II, six years later from 3rd January to 25th March 2015 before the second sylvicultural treatment done in May 2015. During each inventory campaign, tree quality and diameter at breast high were appreciated and measured, with the aim to examine the effect of pruning on Pericopsis elata. The first pruning done in 2009 improved the quality and diameter growth rates of trees. The average percentage of winding trees dropped from 82.8% in 2009 to 44.1% in 2015. The most important average diameters are observed in the pruned plots (27 ±10.47 cm - 31 ±10.04 cm). These plots gained at least 6 cm in diameter in 6 years, which is trice compared to the 2 cm observed in the non pruned plots. The evolution of the growth rates is going to the same sense. The highest growth rates were observed in pruned plots, moving from 0.67 cm/year in 2009 to 0.74 cm/year in 2015 in P 73 and from 0.62 cm/year in 2009 to 0.68 cm/year in 2015 in P 75. The non pruned plots in the other hand registered a decrease in annual growth rates, which dropped from 0.60 cm/year to 0.56 cm/year in the two plots (P745 and P746). These results can be justified by the pruning which eliminated small trees. To better appreciate the effect of the pruning, we limited the analysis on the specific period of 6 years (2009-2015) and on the same trees. Pruned plots have gain at least 6 m²/ha in the stand basal area against 1 m²/ha for non pruned plots. The average annual growth rate in diameter is 0.45 cm/year in pruned plots against 0.34 cm/year in non pruned plots in the same period. These results illustrate the positive effect of the pruning on the development of Pericopsis elata. Results obtained tend to show that the diameter annual growth rate varies not only with the age of plantation, but also with other parameters such as the site, the planting method, and probably the sylvicultural treatment. This suggests that the diameter annual growth rate, which is an important parameter, used in the calculation of the reconstitution rate of Pericopsis elata, should be measured and carefully refined for each production site. },
keywords = {},
pubstate = {published},
tppubtype = {article}
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A study for analysing the response of Pericopsis elata on sylvicultural treatment consisting of pruning was conducted in abandoned plantations settled between 1972 and 1975 in the East and South regions of Cameroon. Inventory was conducted in two phases: phase I from 12th April to 13th June 2009 before the first sylvicultural treatment occurred in September 2009 and phase II, six years later from 3rd January to 25th March 2015 before the second sylvicultural treatment done in May 2015. During each inventory campaign, tree quality and diameter at breast high were appreciated and measured, with the aim to examine the effect of pruning on Pericopsis elata. The first pruning done in 2009 improved the quality and diameter growth rates of trees. The average percentage of winding trees dropped from 82.8% in 2009 to 44.1% in 2015. The most important average diameters are observed in the pruned plots (27 ±10.47 cm - 31 ±10.04 cm). These plots gained at least 6 cm in diameter in 6 years, which is trice compared to the 2 cm observed in the non pruned plots. The evolution of the growth rates is going to the same sense. The highest growth rates were observed in pruned plots, moving from 0.67 cm/year in 2009 to 0.74 cm/year in 2015 in P 73 and from 0.62 cm/year in 2009 to 0.68 cm/year in 2015 in P 75. The non pruned plots in the other hand registered a decrease in annual growth rates, which dropped from 0.60 cm/year to 0.56 cm/year in the two plots (P745 and P746). These results can be justified by the pruning which eliminated small trees. To better appreciate the effect of the pruning, we limited the analysis on the specific period of 6 years (2009-2015) and on the same trees. Pruned plots have gain at least 6 m²/ha in the stand basal area against 1 m²/ha for non pruned plots. The average annual growth rate in diameter is 0.45 cm/year in pruned plots against 0.34 cm/year in non pruned plots in the same period. These results illustrate the positive effect of the pruning on the development of Pericopsis elata. Results obtained tend to show that the diameter annual growth rate varies not only with the age of plantation, but also with other parameters such as the site, the planting method, and probably the sylvicultural treatment. This suggests that the diameter annual growth rate, which is an important parameter, used in the calculation of the reconstitution rate of Pericopsis elata, should be measured and carefully refined for each production site.
Jean Lagarde Betti Pascal Eric Bilong Fils, Prisca Toffon
Quantitative Ethobotany of Gnetum africanum Welw. (Gnetaceae) in Massoumboum, Littoral Region of Cameroon Article de journal
Dans: Journal of Plant Studies, vol. 8, no. 2, p. 19-30, 0000, ISSN: 1927-047X.
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@article{nokey,
title = {Quantitative Ethobotany of Gnetum africanum Welw. (Gnetaceae) in Massoumboum, Littoral Region of Cameroon},
author = {Pascal Eric Bilong Fils, Jean Lagarde Betti, Prisca Toffon, Eric Wété, Jules Romain Ngueguim, Oumar Farick Njimbam, Stéphanie Tientcheu Womeni. },
url = {https://doi.org/10.5539/jps.v8n2p19},
doi = {1927-047X},
issn = {1927-047X},
journal = {Journal of Plant Studies},
volume = {8},
number = {2},
pages = {19-30},
abstract = {Gnetum africanum Welw. is a plant specie of Central and West Africa, a Non Timber Forest Product (NTFP) with high nutritional, medicinal and economic value. In Cameroon, its leaves are recognized by the forestry administration as a special product. Strong demand combined with destructive harvesting techniques has resulted in its rarity in its distribution area. The objective of this work is to characterize the harvesting and trade of G. africanaum, and to assess its abundance (density and structure) in order to appreciate the economic value of the Lehman agroforest system (ALM) based in Massoumboum, a village located at 30 Km of Douala town, the economical capital of Cameroon. An ethnobotanical survey was conducted among harvesters and sellers of G. africanum in the ALM and in adjacent markets. An inventory of G. africanum stems and leaves was carried out at an overall sampling rate of 9.52%. The study revealed that, harvesting of G. africanum is freely done by women, youngers and elders. They start their activity early in the morning and convey their products to markets located in the periphery and inside the city of Douala. The price of the gramme is too high in the periphery than in the city, averaging 0.58 CFA franc. This price is high in the dry season due to the scarcity of other agricultural vegetables. The inventories conducted revealed densities of 6 191 stems/ha and 119 548 leaves/ha, with the high density of leaves obtained in less perturbed plots. The combination of field data (forest inventories) with those obtained in the markets (trade data), what we call «quantitative ethnobotany », allowed us to appreciate the temporal economic value (EV) of the ALM. This EV ranges from 500 000 - 700 000 CFA franc, for an average value of 37 059.9 CFA franc /ha. If well managed, G. africanum can contribute not only to the economy of the women-harvesters, but also to the economy of the ALM. The glaring development challenge of the background of what precedes is the development of non-detriment findings (NDF) for G. africanum in Cameroon. These consist of setting tools which aims to sustain the resource and trade such as the delimitation of Gnetum Allocation Units (GAU), as well as the development and implementation of simple management plans (SMPs). },
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Gnetum africanum Welw. is a plant specie of Central and West Africa, a Non Timber Forest Product (NTFP) with high nutritional, medicinal and economic value. In Cameroon, its leaves are recognized by the forestry administration as a special product. Strong demand combined with destructive harvesting techniques has resulted in its rarity in its distribution area. The objective of this work is to characterize the harvesting and trade of G. africanaum, and to assess its abundance (density and structure) in order to appreciate the economic value of the Lehman agroforest system (ALM) based in Massoumboum, a village located at 30 Km of Douala town, the economical capital of Cameroon. An ethnobotanical survey was conducted among harvesters and sellers of G. africanum in the ALM and in adjacent markets. An inventory of G. africanum stems and leaves was carried out at an overall sampling rate of 9.52%. The study revealed that, harvesting of G. africanum is freely done by women, youngers and elders. They start their activity early in the morning and convey their products to markets located in the periphery and inside the city of Douala. The price of the gramme is too high in the periphery than in the city, averaging 0.58 CFA franc. This price is high in the dry season due to the scarcity of other agricultural vegetables. The inventories conducted revealed densities of 6 191 stems/ha and 119 548 leaves/ha, with the high density of leaves obtained in less perturbed plots. The combination of field data (forest inventories) with those obtained in the markets (trade data), what we call «quantitative ethnobotany », allowed us to appreciate the temporal economic value (EV) of the ALM. This EV ranges from 500 000 - 700 000 CFA franc, for an average value of 37 059.9 CFA franc /ha. If well managed, G. africanum can contribute not only to the economy of the women-harvesters, but also to the economy of the ALM. The glaring development challenge of the background of what precedes is the development of non-detriment findings (NDF) for G. africanum in Cameroon. These consist of setting tools which aims to sustain the resource and trade such as the delimitation of Gnetum Allocation Units (GAU), as well as the development and implementation of simple management plans (SMPs).