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基于通用土壤流失方程(USLE),根据大环江流域自然地理特征,选择降雨侵蚀力(R)、土壤可蚀性(K)、地形(LS)和地表覆盖(C)作为大环江流域土壤侵蚀敏感性评价的因子,运用GIS技术对该流域土壤侵蚀敏感性进行了综合评价。结果表明:大环江流域土壤侵蚀以中度敏感及其以下级别为主,所占面积比重为73.61%,其中极敏感区占10.05%,分布在南部边缘,微度敏感区占14.23%,主要分布在流域西北部地区。分析了影响该流域土壤侵蚀敏感空间分布的原因。
Based on the generalized soil loss equation (USLE), according to the natural geographical features of the Da Huanjiang River Basin, the rainfall erosivity (R), soil erodibility (K), topography (LS) and surface coverage The evaluation index of erosion sensitivity was used to evaluate the sensitivity of soil erosion in this basin using GIS technology. The results showed that the soil erosion was mainly moderately sensitive and below, accounting for 73.61% of the total. The extremely sensitive area accounted for 10.05%, distributed in the southern margin, with the sensitive area of 14.23% Distributed in the basin of the northwestern region. The causes of the sensitive spatial distribution of soil erosion are analyzed.