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Objectifs: Au Cameroun, le cacao est produit dans des systemes agroforestiers avec association d’arbres. Cette etude avait pour objectif d’evaluer la diversite ligneuse, les usages et les stocks de carbone des systemes agroforestiers cacaoyers dans la foret d’enseignement et de recherche de l’Universite de Dschang (FER) a l’Est Cameroun.Methodologie et resultats: L’inventaire a ete realise dans 31 parcelles de 2400 m2 et une enquete realisee aupres des agriculteurs a permis d’identifier l’origine, les differents produits et les usages des arbres. L’estimation des stocks de carbone dans la biomasse ligneuse aerienne et souterraine a ete faite a l’aide des modeles allometriques bases sur la methode non destructive. Au total 71 especes ligneuses appartenant a 32 familles ont ete inventoriees. Les cinq especes les plus frequentes sont Pycnanthus angolensis, Petersianthus macrocarpus, Musanga cecropioides, Terminalia superba et Persea americana. Les arbres conserves sont les plus nombreux par rapport a ceux introduits qui sont majoritairement des fruitiers (Persea americana, Dacryodes edulis et Mangifera indica). Ces arbres associes sont pour la plupart des arbres multi-usages qui fournissent des produits alimentaires et medicinaux, du bois et participent a l’amelioration de la fertilite du sol en plus de l’ombrage fourni aux cacaoyers. La teneur moyenne en carbone des systemes agroforestiers cacaoyers de la FER est de 107 tC ha-1 et depend surtout des arbres associes qui y contribuent a plus de 95%.Conclusions et application des resultats: Plusieurs contraintes a la plantation des arbres ont ete mises en evidence et devraient etre levees par une assistance technique aux agriculteurs. Les strategies d’amelioration doivent tenir compte des especes sollicitees par ces agriculteurs dans la recherche des meilleurs compromisentre la production cacaoyere, et les autres services rendus par les arbres.Mots-cles: Agroforesterie, Cacaoculture, Carbone, Espece ligneuse, Service ecosystemique, CamerounEnglish Title: Tree diversity and carbon stocks in cocoa based agroforestry systems in eastern Cameroon: case study of the learning and research forest of the University of DschangEnglish AbstractObjectives: In Cameroon, cocoa is produced in agroforestry systems with association of trees. The objective of this study was to evaluate the woody diversity, uses and stocks of carbon of the agroforestry cocoa systems in the teaching and research forest of the University of Dschang in eastern Cameroon.Methodology and results: The inventory was carried out in 31 plots of 2400 m2 and a survey of farmers permitted us to identify the origin of trees, their different products and uses. An estimation of carbon stocks in above ground and underground woody biomass was made using allometric models based on non-destructive method. A total of 71 woody species belonging to 32 families were counted. The five most frequent species identified are Pycnanthus angolensis, Petersianthus macrocarpus, Musanga cecropioides, Terminalia superba, and Persea americana. Preserved trees are more abundant with respect to those introduced, which were mainly fruit trees (Persea americana, Dacryodes edulis and Mangifera indica). These associated trees are mostly multi-purpose trees that provide food, medicine and wood and contribute to the improvement of soil fertility while providing shade to cocoa. The average carbon content of the cocoa agroforestry systems is 107 tC ha-1. This amount is mainly due to the associated trees which contribute for about 95%.Conclusions and application of results: Several constraints to planting trees have been highlighted and should be taken into account via technical assistance to farmers. Strategies to improve the cocoa based agroforestry systems must take into account the tree species needed by farmers in the search for the best trade-offs between cocoa production and other services offered by trees.Keywords: Cocoa farming, Woody species, Agroforestry, Carbon, Ecosystemic service, Cameroon

journal of applied biosciences

Diversité Ligneuse et Stock de Carbone des Systèmes Agroforestiers à base de Cacaoyers à l’Est Cameroun : Cas de la Forêt d’Enseignement et de Recherche de l’Université de Dschang