Assessment on soil conservation service based on InVEST model —a case study of Yindingge mining area
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摘要: 基于InVEST模型土壤保持模块,应用降雨侵蚀力、土壤可蚀性、植被覆盖度、DEM和土壤保持措施因子等数据,对福建省大田县银顶格矿区小流域生态修复前后的土壤保持功能进行了评估分析。研究区生态修复后土壤保持总量和土壤保持强度明显提高,强烈及其以上侵蚀地区面积占比从21.0％降低至8.7％,生态修复工程对提升土壤保持功能效果较好;林地、水田的土壤保持强度较强,随着坡度的升高,植被覆盖度也在提高,泥沙截留能力和土壤保持能力也相应增强。土壤保持模块考虑了地块自身拦截上游沉积物的能力,使得土壤保持功能计算结果更加真实、准确、直观。Abstract: Based on the SDR module of the InVEST model, the soil conservation function before and after ecological restoration in the small watershed of Yindingge mining area, Datian County, Fujian Province was evaluated and analyzed with the rainfall erosivity, soil erodibility, vegetation coverage, DEM and soil conservation factors. The results showed that the total area and intensity of soil conservation in the study area increased significantly after ecological restoration, and the intensely/more intensely eroded-area decreased from 21.0% to 8.7%, indicating a good effect on soil conservation improved by the ecological restoration project. The soil conservation intensity of paddy field and forestland was stronger. The vegetation coverage expanded with the rise of slope gradient, while sediment retention capacity and soil conservation capacity were also enhanced correspondingly. The design of SDR module considers the block's ability to intercept upstream sediment, making the calculation result of soil conservation function more actual, accurate and intuitive.
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