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Une des consequences environnementales de la degradation forestiere est la perte de carbone, qui a son tour contribue indirectement au changement climatique. Dans la perspective d\'evaluer la contribution des savanes de l\'Adamaoua dans le changement climatique, une etude portant sur l\'estimation de stock du carbone a ete menee dans les facies arbustifs et arbores. La quantite de carbone a ete estimee dans des parcelles carrees de 100 m2 pour les arbres et les arbustes, de 1 m2 pour le sous-bois et de 0,0625 m2 pour les racines et le sol. Le dispositif experimental est un bloc completement randomise a trois repetitions. Les types de savanes sont des traitements principaux et les parcelles les repetitions. Les resultats montrent que la quantite totale de carbone est de l\'ordre de 81,48 et 118,36 tC/ha respectivement pour la savane arbustive et arboree. Dans la savane arboree, l\'essentiel de carbone est stocke dans la phytomasse des arbres (65,30 tC/ha) et dans le sol (48,37 tC/ha); la contribution des arbustes (3,83t/ha) des herbacees (0,30t/ha), des racines (1,96 tC/ha) et des litieres (1,88 tC/ha) est faible, moins de 5% de carbone totale. Par contre, dans la savane arbustive, le sol constitue le principal reservoir de carbone (74,35 tC/ha). Les autres composantes a savoir les arbustes (0,66 tC/ha), les herbacees (3,15 tCha), les racines (1,98 tC/ha) et les litieres (1,34 tC/ha) ont une contribution tres faible, moins de 9% de la quantite totale de carbone. Les differences observees entre la savane arboree et arbustive sont dues en grande partie a la difference de leur structure et de leur composition floristique. Ces resultats preliminaires contribuent a la comprehension de l\'impact des conversions des savanes sur le changement climatique. Ceci permettra une prise de decision dans la gestion durable des savanes et la protection de l\'environnement. One of the environmental consequences of the modification of savannas is a carbon loss which in turn contributes indirectly to global climate change. In order to evaluate contribution of Adamawa savannas in global climate change, a study on the sequestration of carbon was conducted both in a shrubby and woody savannas of Ngaoundere. The quantity of carbon was estimated in a square plot of 100 m2 for the trees and shrubs, of 1m2 for grass and 0.0625 m2 for the roots and the soils. The experimental design is a randomized complete block with three replicates. The type of savannas are main treatment whereas the plots are replicates. The results show that the total average of carbon is about 81.48 tC/ha in shrubby savannas and 118.36 tC/ha in woody savannas. In the woody savannas, the essential of carbon was stored in the trees (65.30 tC/ha) and in the soil (48.37 tC/ha). Whereas in the shrubby savannas, it is based on in the soil. The contribution of shrubs and grass (0.78 tC/ha), roots (1.96 tC/ha) and litters (1.88 tC/ha) is less than 5% of the global quantity of carbon. Shrubby savannas soil appears to be the main carbon tank (74.35 tC/ha). The other components of shrubby savannas as shrubs, grass, litters and roots contributed for less than 9% in the total amount of carbon. The differences noticed between the type of savannas are due to their floristic structure et composition. These preliminary results contribute to the understanding impacts of savannas conversion to global climate change. This would allow to make decision in sustainable management of savannas and environment protection. Keywords : Phytomass, Carbon storage, soudano-guinea savannas, Ngaoundere, Cameroon Cameroon Journal of Experimental Biology Vol. 4 (1) 2008: pp. 1-11

Estimation du stock de carbone dans les faciès arborés et arbustifs des savanes soudano-guinéennes de Ngaoundéré, Cameroun.