Development and application of the soil organic carbon model considering physical hydrological processes

초록

Human activities have significantly increased greenhouse gas emissions, accelerating global warming and intensifying the climate crisis. In this context, soil serves as a vital carbon sink; however, its functionality is diminishing due to indiscriminate development. Particularly, soil erosion leads to the loss of topsoil, which is rich in soil organic carbon, thus altering carbon dynamics within watersheds. In this study, we developed a model for estimating soil organic carbon by integrating a biogeochemical soil carbon model with a physically-based soil erosion model that accounts for the physical processes of soil erosion. This model was evaluated for its applicability in domestic watersheds, demonstrating excellent performance in runoff and sedimentation simulations with NSE, RSR, PBIAS, and PR values of 0.73, 0.27, -14.6, 1.14 and 0.69, 0.32, 2.6, 1.11, respectively. The soil respiration simulation exhibited good performance across most periods, and the results for soil carbon dioxide flux by land use type were consistent with observations from previous research. Consequently, this model can serve as an effective analytical tool for developing soil management policies, such as managing soil erosion risk areas and conducting preliminary investigations to establish carbon sinks.

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