Research On Ecology Security Index System In Gansu Areabased Fuzzy Comprehensive Evaluation

On account of the uncertainty and fuzzy feature about the assessment on the safety of urban water ecology, in order to optimize and analyze the preliminary evaluation index system, the fuzzy system analysis was used to evaluate water ecological security in Gansu province which consisting of 44 indexes, then find the main factors which influence the water ecological security situation in Gansu province, Combining with correlation analysis, eliminate the minor impact factor index, formation an optimized water ecological security evaluation index system which was composed of 37 index for Gansu province. The optimized index system was used to conduct the water ecological security situation fuzzy comprehensive evaluate of Gansu province. The results showed that:(1) The water ecological security situation in Gansu province is not optimistic on the whole, the water ecology security situation was well only in Jiuquan, Zhangye and Lanzhou, and the water ecology security situation was in levelⅠarea. The water ecology security situation was ordinary in Baiyin, Linxia, Dinxi, Tianshui, Qinyang and Wuwei, and the water ecology security situation was in levelⅡarea; The water ecology security situation are poor in Jiayuguan, Jinchang, Gannan and Longnan, the water ecology security situation was in level Ⅲ area; the results of fuzzy comprehensive evaluation about the water ecological security situation in Gansu province presented a normal distribution, which is consistent with the reality, the results showed that with the method of fuzzy comprehensive evaluation to fuzzy comprehensive evaluate the water ecological security situation in Gansu province is feasible.(2)The paper use the preliminary water ecological security evaluation index system for Gansu province, with the method of fuzzy comprehensive evaluation to fuzzy comprehensive evaluate the water ecological security situation in Gansu province, contrast the optimized results and preliminary results which use the method of fuzzy comprehensive evaluation, the optimized results overall was lower, and get the result of this two evaluation index system with the method of fuzzy comprehensive evaluation have a similar movement, the result showed that the evaluation index system has good stability.(3)With the method of fuzzy system analysis to fuzzy system analysis water ecological security evaluation index system which was preliminary built, to determine the main impact factor index of region water ecological security situation in Gansu province, the index were: the urban population, urban public water, industrial water, fruit irrigated area, water for forest and fishing, living water consumption, total water use, irrigated land area and farmland irrigation area; At the same time found some impact factors that affects the water ecological security situation is smaller, mainly include: the tertiary industry output value, the output value of national output value, the second industry, gross industrial output, the added value of state-owned and large, river base flow and runoff, water resources, the added value of the following scale. The result showed that the method was good for regional urban construction and environmental protection departments to coordinate economic development and water ecological security provide theoretical guidance, and in the same time respond to the country’s five-in-one development strategy layout.(4)Finding the main impact factor which affecting region water ecological security situation, it provided a theoretical reference for local government by environmental management and so on which related to water ecology theory, it played a positive role in promoting the water ecological security situation in Gansu province.