泥石流多发区生态安全评价——以汶川县为例

Ecological security assessment of heavy debris flow regions:A case study in Wenchuan County

通过对四川省汶川县的地形、植被、气候和社会经济等数据的收集、整理,应用生态安全理论构建泥石流多发区的生态安全评价指标体系与综合指数,采用地理信息系统(GIS)结合主成分分析方法,对汶川县119条小流域的生态安全状况进行了评价。结果表明:1)泥石流多发区生态安全水平主要与地形因子相关,人类不合理的开发利用加剧了生态安全的变化和生态环境恶化;2)划分的五类生态安全区中,生态不安全区、较不安全区、临界区占全县面积的41.17%,其大部分位于岷江沿岸;3)对生态安全指数的分级经过验证,评价结果与现实状况吻合。

In this paper, an index system based economic data was built to assess the ecological on topography, vegetation, climate, and socialsecurity of Wenchuan County in Sichuan Province, and Geographical Information System technology and Principal Component Analysis method were used for the ecological security assessment of 119 catchments in the County. The results showed that （1） the ecological security in the heavy debris flow regions was closely related to topography, and unreasonable human disturbance greatly affected the ecological security and ecosystem stability, （2） the areas of insecurity, relative insecurity, and critical security made up about 41.17% of the total area, and most of them were along Minjiang River, （3） the grading of ecological security index was consistent with the actual status by validation.