摘要
在"压力—状态—响应"模型的基础上,针对南海湿地生态系统,建立了健康评价指标体系;采用层次分析法,确定各指标的权重;采用集对分析方法,描述健康评价过程中的确定性和不确定性特征,并应用分段三角模糊数,刻画集对差异度系数,进而提出了利用集对分析和分段三角模糊数的南海湿地健康评价模型。研究结果表明,南海湿地生态健康综合联系度为-0.287,相应的级别特征值为3.574,健康状态整体处于IV级,即一般病态,评价结果与实际情况吻合。其中,压力、状态和响应子系统的级别特征值分别为3.689、3.669和3.155,压力和状态子系统都处于IV级(一般病态),响应子系统健康状态处于III级(亚健康)。从各子系统级别特征值和指标权重可知,影响系统健康的主要因素为人口密度、湿地周边人口素质、地表水质、水营养状态、水生植物覆盖率、湿地原生性和现有政策法规。
A health assessment index system was established for Nanhai wetland ecosystem based on the Pressure-State-Response（PSR） model. The weight of each index was determined by the analytic hierarchy process（AHP）. The set pair analysis method（SPA） was applied to depict the uncertain characteristics of relation between the evaluation sample and grade classification standard with the piecewise triangular fuzzy numbers express the uncertainty of component coefficients of discrepancy degree. Moreover, a coupling method based on set pair analysis and piecewise triangular fuzzy numbers for health assessment of Nanhai wetland ecosystem was established. The results showed that the Comprehensive connection degree of ecological health for Nanhai wetland was-0.287, and it＇s corresponding grade characteristic value of ecosystem was 3.574, which could be categorized as a general sick level. The result was identical with truth. The grade characteristic value of pressure subsys-tem, state subsystem and response subsystem were 3.689, 3.669 and 3.155 respectively,which means the pres-sure subsystem and state subsystem were in general sick level, but response subsystem was in sub-heath level. According to the grade characteristic value of each subsystem and weight of indexes,the main factors affecting the ecosystem system were population density, population quality, surface water quality, eutrophication, coverage rate of aquatic plants, wetland origin and existing policies and regulations.
出处
《湿地科学》
CSCD
北大核心
2017年第2期207-213,共7页
Wetland Science
基金
国家自然科学基金项目(41263010)
内蒙古科技大学创新基金项目(2015QDL16)
内蒙古包头黄河湿地生态系统国家定位观测研究站补助项目(2015-LYPT-DW-037)资助
关键词
生态系统健康评价
集对分析
三角模糊数
包头南海湿地
ecosystem health assessment
set pair analysis
piecewise triangular fuzzy numbers
Baotou Nanhai wetland
