Study of soil degradation and watershed management with sediment and organic carbon dynamics

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Excess soil and nutrients yields transport toward the coastal zones and deposition on corals are one of the major environmental problems in Okinawa, Japan, in which agricultural area is the major source of sediment yield. In this study, runoff of sediment, organic carbon are observed in several agricultural field and Todoroki River watershed in Yaeyama region. Storage capacity for soil organic carbon varied with landuse and management distinctly. Organic carbon runoff at Todoroki River watershed was related with sediment runoff. Simulated sediment and organic carbon runoff using the WEPP model was clarified the positive effect of no-tillage farming and adding residue mulch.