广西岩溶区大化县生态环境脆弱性评价

Assessment of Eco-environmental Vulnerability in Dahua County,Karst area of Guangxi

广西大化县属于典型的岩溶地区,具有岩溶区特有的脆弱生态环境系统,石漠化面积较大,生态系统稳定性差.以大化县16个乡镇为评价对象,合理选取9项岩溶地区生态环境脆弱性影响因子,并建立生态环境脆弱性评价指标体系,采用主成分分析方法确定各指标的权重和模糊综合评价分析方法进行生态环境脆弱性评价,从而为大化县的岩溶生态系统的恢复和重建、土地利用结构的优化提供参考资料.结果表明,有4个中度脆弱乡镇,8个轻度脆弱乡镇,4个潜在脆弱乡镇.图1,表5,参16.

Dahua county is the typical Karst region with eco-environmental vulnerability, where de- generation of soil is serious, the proportion of rocky desertification area is large and the stability of ecosys- tem is poor. 16 villages and towns of Dahua county were taken as the evaluation object,9 influencing fac- tors of eco-environment vulnerability were selected to establish an evaluating index system, the principal component analysis method was used to give weight for different assessment indicators, and a model of fuzzy mathematics by fuzzy comprehensive evaluation method was adopted to analyze and evaluate the eco- environment vulnerability of Dahua county. The results showed that there are 4 potentially vulnerable towns,8 gently vulnerable towns and 4 moderately vulnerable towns among the 16 villages and towns in Dahua, which could provide reference for the restoration and reconstruction of karst ecosystem, and the structure optimization of land use in Dahua County. lfig. ,5tabs. , 16refs.