基于综合法的岩溶山区生态系统脆弱性评价——以贵州省普定县为例

基于主成分分析法，以贵州省普定县区域内的13个行政村落为例，对影响该区生态系统脆弱度的9个变量进行分析，并利用欧式距离公式确定系统的脆弱性。结果表明，耕地面积是影响生态系统脆弱度的最主要因素，占的权重值为0.189，其次是石山地区的平均坡度；在研究区域中有7个村落达到强度脆弱或极强度脆弱，其中偏坡村的潜在脆弱性和胁迫脆弱性为最大；作为一个整体评价单元，研究区的生态系统脆弱度为0.653，属于强度脆弱区。为此，今后应该积极采取相应的治理措施，尤其是注意从控制耕地开发利用规模上来恢复生态环境。 

Assessment on ecosystem fragility of karst mountain areas based on synthetic method- A case study in Puding Country, Guizhou Province

Based on principle component analysis and taken 13 villages in Puding Country, Guizhou Province as the example, the authors analyze 9 variables influencing ecologic al frangibility, and calculate the fragility with Euclidean distance formula. The results show that the cultivated area is the most import ant factor in determining the ecological vulnerable degree and its weighted value is up to 0.189, and the average gradient is the second factor. Among the 13 villages, there are 7 villages falling into severely or extremely fragile areas. Especially in Pianpo village whose vulnerable degree is maximum both in potential fragility and stress fragility. The study area evaluated as a whole is classified as severely fragile areas with an ecological fragile degree of 0.653. According to the standard of estimation grade, the authors find the Puding Country belongs to moderately fragile degree and we must take measures to recovery the ecoenvironment by controlling the land use for agricultural.