基于变异系数法的灵宝市土地生态敏感性分析

Land Ecological Sensitivity Analysis of Lingbao City Based on the Coefficient of Variation Method

选定河南省灵宝市地貌、地质灾害易发程度、土地覆被、土壤类型和地形坡度等5个因子,构建土地生态敏感性评价指标体系,采用客观确权法-变异系数法确定各个因子权重,结合ArcGIS,运用加权评分法得到灵宝市土地敏感性分布情况。结果表明,灵宝市土地生态环境总体较脆弱,以极敏感和高敏感为主,占全市面积的52.90%,不敏感和低敏感区占全市面积的23.89%。

Five factors of Lingbao city in Henan province were selected,including the landform,the degree of susceptibility to geological disasters,land cover type,soil type and topographic gradient,and the evaluation index system of land ecological sensitivity was constructed. Objective weighting method-coefficient of variation method was used to determine the weight of each factor. Combined with Arc GIS,Weighted grading method was used to get the distribution of land sensitivity in Lingbao city.The results showed that the ecological environment of Lingbao was generally fragile, with mainly very sensitive and highly sensitive,accounting for 52.90% of the total area of the city; While insensitive and low sensitive area accounting for 23.89%of the total area of the whole city.