ABSTRACT
This chapter analyzes the carbon (C) concentrations in different water reservoirs in different forms in relation to the weathering rate and the C content in the soils of five nested catchments belonging to the Nyong basin in South Cameroon. The regional substratum is granite-type. The southern part of the study area is mainly constituted of Liberian granitoids of the Ntem group, and corresponds to the edge of the Congo craton, whereas the northern part, with gneisses and migmatites of the Yaoundé series metamorphized during the Panafrican orogenesis is the western continuation of the Oubanguide chain. A spatial distribution of pedologic horizons in the Nsimi catchment was done from pits and holes and using resistivity measurements along several cross sections. The Yaounde-Sangmelima-Abong Mbang triangular area is mainly the domain of the semi-deciduous forest, characterized by Stertuliaceae and Ulmaceae. Soils were sampled on Nsimi catchment, using profiles on summit and side slopes, and by auger in the valley.
