基于粗糙集理论的淡水湖泊湿地生态系统健康评价研究
The Study on Ecosystem Health Evaluation of Freshwater Lake Wetlands Based on Rough Set Theory

该文旨在通过构建淡水湖泊湿地生态健康评价指标体系,对比分析长江流域中的鄱阳湖、西洞庭湖、洪湖3个淡水湖泊湿地的生态系统健康状况.首先从水环境、土壤、生物、景观和社会等1级指标中列出13个2级指标,并利用粗糙集理论对13个指标进行约简,得到由5个1级指标和8个2级指标构成的湖泊湿地生态系统健康评价指标体系; 然后运用层次分析法对1级指标进行主观赋权,以及采用基于信息粒度的属性重要度原理对2级核心指标进行客观赋权,再将2种权重组合起来得到评价指标的权重系数; 最后通过加权和的方式计算出3个淡水湖泊湿地的综合健康指数,以便进行生态系统健康状况比较.研究结果表明:3个湖泊湿地生态系统的健康等级均为中等,综合健康指数排序为洪湖(6.063)>鄱阳湖(5.997)>西洞庭湖(5.458).
The purpose of this paper is to compare the ecosystem health condition of three freshwater lake wetlands,including Poyang Lake,Dongting Lake and Honghu Lake in the Yangtze River basin,by constructing the evaluation index system of ecological health on freshwater lake wetland.For achieving this objective,13 second grade indexes are firstly given under 5 first grade indexes that involve water environment,soil,biology,landscape and society.Thirteen indexes are reduced by using rough set theory,and so a set of evaluation index system of ecosystem health on lake wetland,which is composed of five first grade indexes and eight second grade indexes,is obtained.Secondly,the subjective weights are used to assign five first grade indexes by the analytic hierarchy process(AHP)method,and the objective weights are used to assign eight second grade core indexes by using the attribute significance principle based on information granularity,then two kinds of weight are combined to get the weight coefficients of the evaluation indexes.Lastly,the comprehensive health indexes of three freshwater lake wetlands are calculated by means of weighted sum so as to compare the ecosystem health conditions of three freshwater lake wetlands.The results show that all of the ecosystem health grade of three lake wetlands are medium,and the value of comprehensive health index follows the order of Honghu Lake(6.063)>Poyang Lake(5.997)>West Dongting Lake(5.458)