The Study on Soil Erosion and Carbon Sequestration in Zhanjiang City Using RUSLE-InVEST Model

This study aims to reveal the spatiotemporal differentiation characteristics of soil erosion and carbon sequestration in Zhanjiang City and their underlying causes, providing a scientific basis for ecosystem monitoring in the region. Based on the RUSLE-InVEST model and geographic detectors, data from four years (2013, 2017, 2020, and 2023) were selected to analyze the main driving factors and mechanisms of soil erosion, as well as the spatiotemporal variations in carbon sequestration in the study area. The results indicate that soil erosion in Zhanjiang City exhibits significant spatial heterogeneity, with an overall increasing trend in erosion severity. In single-factor analysis, precipitation and land use type factors showed higher explanatory power for soil erosion. In interaction factor analysis, all factor interactions demonstrated either two-factor enhancement or nonlinear enhancement. Overall, the intensity of soil erosion in Zhanjiang City fluctuated over time, and carbon sequestration showed a significant correlation with changes in soil erosion intensity. High-risk erosion areas require prioritized management, and region-specific differentiated governance strategies are recommended based on local conditions.