Abstract
The humid tropical ecosystems play an important role in controlling the worldwide elemental and carbon global cycles (White and Blum, 1995). While weathering inputs to large tropical rivers (Amazon, Congo) have received considerable attention (Gaillardet et al., 1995), the current weathering/ erosion processes at the small catchment scale are still at low level of knowledge in the humid tropics (Viers et al., 1997 ; Braun et al., 1998 ; White et al., 1998). The present study aims (1) to identify the major weathering processes occuring on the scale on a representative humid tropical catchment on granitic basement and (2) to quantify the particulate/solute fluxes of major ions and organic carbon (COD, COP). During the period from August 1994 to December 1997, hydrological and geochemical data have been collected in the different pools (atmospheric depositions, surficial and ground waters) of the small catchment of Nsimi (South Cameroon) (0.6 km2). This is drained by the Mengong brook which belongs to the Nyong river basin (27800 km2). This basin is the second largest of Cameroon and is entirely located under the tropical rainforest between the latitudes 2~ and 4~
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