基于GIS的广西岩溶生态环境脆弱性评价

以广西岩溶区为例，从导致岩溶生态环境脆弱性的本质因素入手，建立了岩溶生态环境脆弱性评价模型．选取碳酸盐岩分布面积百分比、地形坡度、地貌类型、土壤侵蚀强度、石漠化面积百分比、森林和灌丛覆盖率、早涝片面积作为评价因子，利用层次分析法确定评价因子的权重，并以ArcGis 8 Desktop为平台，利用软件的空间分析功能，通过模型的空间关系识别，进行了广西岩溶生态区脆弱性评价．

Assessment of Karst Eco-environmental Vulnerability in Guangxi

Karst landforms are wildly distributed in Guangxi autonomous region,with carbonate rock covering an area of 98 700 km~2 where the eco-environmental is very vulnerable.Karst areas in Guangxi are characterised by low environmental capacity,weak anti-hazard capability and poor stability.Fragile karst is one of main factors that restrict economic and the environmental sustainable development in Guangxi.Based on practical monitoring results of eco-environmental background and human activities in Guangxi,this paper sets up an evaluating index system of the vulnerable eco-environments.The weight of each factor influencing eco-environmental vulnerability is determined with analytic hierarchy process method.Using spatical analyst based on ArcGis,through identify of spatial relationship between the datasets,assessment of eco-environmental vulnerability has been made.As a result,3% areas in Guangxi karst region are extremely vulnerable grades,43% heavily and 44% areas moderately.