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Article Dans Une Revue CATENA Année : 2022

Processes controlling the organic matter degradation in a tropical coastal wetland: Mboro, Senegal

Résumé

The Northern coastline, from Kayar to Saint Louis (Senegal) is characterized by a succession of dunes and interdunes. Coastal wetlands located in the inter-dunes which bear Organic Matter (OM) rich soil where market garden agriculture is the main activity. These zones locally called ``Niayes'' are characterized by shallow groundwater table threatened by anthropogenic pressure, climate and environmental impacts. The scientific interest of this research work is to characterize the composition of soil OM to discuss its origin, composition, and diagenetic evolution in this depositional environment of Mboro research site with regard to natural and anthropogenic pressure. Three selected core samples with depth interval of 5 cm aligned in along a slope transect in the Mboro wetland were carried out. Soil OM were analyzed for Particulate OM, C/N, Rock-Eval HI and OI, 813C, 815N whereas sediments and water were respectively analyzed for grain size distribution, water contents and redox potential down to 50 cm depth. We have demonstrated through the results a vertical variability in the content, the nature and preservation quality of sedimentary OM with the occurrence of a peat storage zone. The isotopic markers depict a strong contribution of C3 plants, macrophytes and to a lesser extent of algae and microbial organic materials. High concentrations of dissolved nutrients occurring mainly on the surface slope may derive from the use of fertilizers to improve agricultural yields. These results constitute an added value in the scientific knowledge of this sector of the Niaye of Senegal.
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Dates et versions

hal-04420295 , version 1 (26-01-2024)

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Mariama Kaba, Valerie Mesnage, Issa Sakho, Serigne Faye, Mohammed Boussafir. Processes controlling the organic matter degradation in a tropical coastal wetland: Mboro, Senegal. CATENA, 2022, 217, ⟨10.1016/j.catena.2022.106419⟩. ⟨hal-04420295⟩
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