基于GIS的东至县土壤侵蚀敏感性评价

以通用土壤流失方程为基础,选择降雨侵蚀力、地形起伏度、土壤质地、地表覆盖4个因子作为评价指标,根据东至县的自然环境特征,制定评价指标的分级标准,在GIS软件的支持下,对东至县的土壤敏感性的影响因子进行分级和综合评价。结果表明：东至县总体上土壤侵蚀的敏感性程度很高,高度及高度以上敏感类型的面积为2183.35km2,占研究区土地总面积的67.05%,其中,极度敏感性面积最大,为1312.94 km2,占40.32%,其次为中度敏感、高度敏感、轻度敏感、不敏感,分别占研究区土地总面积的26.73%、25.96%、6.97%和0.02%。从空间分布看,南部与东南部主要以高敏感与极敏感度为主。

Sensitivity Evaluation of Soil Erosion in Dongzhi county

Based on Universal Soil Loss Equation,four natural influence factors of soil erosion were chosen as the assessment indices,which are precipitation,topology,soil texture and vegetation land cover.According to the natural environment characteristics of Dongzhi county,the indices for soil erosion were classified into five degrees and were clearly analyzed in the support of GIS.The results showed that the entire sensitivity of soil erosion class is rather high in Dongzhi county,which 67.05 percent of the total ...