ABSTRACT

This study evaluates the potential danger of soil erosion with regard to the current poor situation in the typical karst area of Anshun City in Guizhou Province (China) and provides a reference for the prevention and control of soil erosion in karst areas. The criteria of the Standards for classification and gradation of soil erosion and Techniques standard for comprehensive control of soil erosion and water loss in karst area in non-karst and karst areas, respectively, GIS, and high-resolution remote sensing image interpretation results of land use are used to explain the intensity of soil erosion and soil loss tolerance. Results show that soil erosion rate calculated by different standards in the karst area is consistent with the monitoring value. The average erosion modulus of Guizhou Anshun is 446.83 t/(km²·a), the soil erosion area is 2,861.01 km² with a ratio of 30.9%, the soil erosion potential danger index (SEPDI) value is relatively small and mainly includes free- and light-danger types, and the average SEPDI value is 1.7. The soil erosion control project of Anshun City can range according to the SEPDI level of villages, which can be comprehensively managed from high to low. Soil erosion prevention and control in karst areas should use SEPDI as the core indicator rather than soil erosion intensity grade.

摘要

本研究针对贵州省安顺市典型喀斯特地区当前的贫困状况，评估土壤侵蚀的潜在危险性，为喀斯特地区土壤侵蚀的防治提供参考。这些标准的标准来分类和土壤侵蚀的层次和技术标准，在岩溶地区土壤侵蚀和水土流失综合治理在非岩溶和岩溶地区，分别利用GIS和土地利用高分辨率遥感影像解译结果解释土壤侵蚀强度和土壤流失耐受性。结果表明，喀斯特地区不同标准计算的土壤侵蚀速率与监测值一致。贵州安顺平均侵蚀模数为446.83 t/(km ² ·a)，土壤侵蚀面积为2,861.01 km ²土壤侵蚀潜在危险指数（SEPDI）值相对较小，比例为30.9%，主要包括无害型和轻危型，平均SEPDI值为1.7。安顺市水土流失治理工程可根据村级SEPDI水平，由高到低综合治理。岩溶地区水土流失防治应以SEPDI作为核心指标，而不是土壤侵蚀强度等级。