广西岩溶县的生态环境脆弱性评价

广西岩溶区属典型的生态环境脆弱区,宜耕地资源不足,土地退化严重,承受自然灾害能力低,使岩溶山区的社会经济发展和生态环境的协调性差,可持续发展能力弱。选择了广西区27个岩溶县作为评价对象,以11项生态环境脆弱影响因子为评价指标建立岩溶生态环境脆弱性评价体系,利用模糊综合分析法进行岩溶石漠化区生态环境脆弱性评价。结果表明,极度脆弱的岩溶县2个,重度脆弱5个,中度脆弱17个,轻度脆弱3个。

AN ASSESSMENT OF ECO-ENVIRONMENTAL VULNERABILITY IN KARST COUNTIES OF GUANGXI

Karst landforms are widely distributed in the Guangxi Zhuang Autonomous Region, with carbonate rocks covering an area of 90770 km~2, where the eco-environment is very vulnerable. Karst areas in Guangxi are characterized by low environmental capacity, weak anti-hazard capability and poor stability. Karstification is one of the main factors that affect economic and environmental sustainable development in Guangxi. Based on monitoring results of the eco-environmental background and human activities in 27 counties of Guangxi, this paper presents an evaluating index system for the vulnerable eco-environments. The weight of each factor influencing eco- environmental vulnerability is determined with the analytic hierarchy process method. The assessment of eco-environmental vulnerabilities of karst regions was made by the fuzzy comprehensive evaluation method. As a result, in the 27 karst counties, two are extremely, five heavily, seventeen moderately and tree lightly vulnerable, respectively.