Evaluation method of ecological environment vulnerability and its application

摘要

The Karst area in Chongqing is typical eco-environmental vulnerable area, where farmland is insufficient and degeneration of soil is serious, ability of enduring the natural calamities is vulnerable. Consequently, coordination between development of social economy and eco-environment is inferior, and sustainable developmental ability is feeble. The Karst area of Chongqing in China as a study case, this paper picks up 13 influencing factors of eco-environment vulnerability to be assessment indicators, containing earth surface of carbonate rock salt, area of mountainous region, area of slopping upland farming, degree of rock desertification (classified by gently, moderately, seriously), forest coverage, loss area of water and soil, soil erosion modulus, slip volume density, cultivation index, farmland area per capita, agriculture population density, subsequently, uses analytic hierarchy process (AHP) to endow index weight, and sets up assessment model by using fuzzy mathematics method to analyze and evaluate the eco-environment vulnerability of Karst area, finally, conducts the rank divisions towards the assessment results. Results indicate: there are 3 potentially vulnerable counties, 10 gently vulnerable counties, 6 moderately vulnerable counties and 6 seriously vulnerable counties among the 25 Karst counties in Chongqing.