中国西南部岩溶山区生态环境脆弱性评价

STUDY ON ECO-ENVIRONMENT FRAGILE EVALUATION OF KARST MOUNTAINS IN SOUTHWEST CHINA

中国西南部岩溶山区属于典型的生态环境脆弱区,其地壳表层石漠化现象日趋严重。通过分析人类活动和生态环境之间的关系,确定了适合该区的生态环境脆弱性判断的主要关键指标。在此基础上,利用层次分析法确定这些关键因子对该地区生态环境脆弱性影响程度的大小,并利用建立的模型对岩溶山区的生态环境脆弱性进行了综合的半定量评价。评价结果将其生态环境分为5类:极端脆弱区、严重脆弱区、中等脆弱区、轻度脆弱区、潜在脆弱区,并针对各脆弱区的特点提出相应的生态防治对策。

The karst mountains in Southwest China are a typical ecoenvironment fragile area.As a main result of interactions between irrational human activities and the vulnerable ecogeoenvironmental settings,rock desertification has become one of the most serious environmental,social and economic problems.The paper establishes the index system of evaluation for the region by analyzing the relationship between human activities and environmental changes. Based on the analysis,the weight of each factor influencing ecoenvironmental vulnerability is determined with analytic hierarchy process method, and the extent of fragility is calculated by establishing the model.The result can be classified into extreme fragility,serious fragility,moderate fragility,gentle fragility and potential fragility.According to the characters of each class,the paper has put forward the countermeasures to rehabilitate the ecoenvironmental conditions.