基于模糊物元模型的西苕溪流域生态系统健康评价

本文借助RS/GIS技术,结合遥感影像数据、环境监测数据和社会经济数据,运用模糊物元模型,从水域、水陆交错带和陆域子系统选取21项评价指标,建立了流域生态系统健康综合评价指标体系,对西苕溪流域生态系统健康状况的空间分布规律和限制性因子进行了探讨.研究结果表明,西苕溪流域生态系统健康整体呈现出优良状态,其中,生态系统健康优秀地区面积占68.2%,良好地区面积占31.8%,能够正常发挥流域服务功能,维持生态系统可持续发展.西苕溪流域生态系统健康在空间分布上呈现出上游好、下游差的局面.在各子系统健康评价中,水域生态系统优于陆域生态系统,水陆交错带生态系统最差.底栖动物完整性遭受破坏、湿地退化、人为干扰活动、水源涵养功能减弱、点源和面源污染负荷较重是限制西苕溪流域部分评价单元生态系统健康的重要因素.

Evaluation of ecosystem health in Western Tiaoxi River watershed based on matter element model

Based on RS/GIS technology combined with remote sensing image data, environmental monitoring data and social economic data, this study applied the matter element model to construct the western Tiaoxi river watershed ecosystem health comprehensive evaluation index system with 21 evaluation indexes selected from aquatic, amphibious staggered and terrestrial subsystems. Spatial distribution pattern and limiting factor of ecosystem health of Western Tiaoxi River watershed were also discussed. Overall, ecosystem health situation in Western Tiaoxi river watershed is good. Areas classified as excellent and good accounted for 68.2% and 31.8% of the total area, respectively, which can play a normal watershed function and maintain sustainable development of the ecosystem. The ecosystem health in upstream of western Tiaoxi river watershed is better than the downstream. The health in the aquatic subsystem is better than terrestrial subsystem, while the health of amphibious staggered subsystem is the worst. Zoobenthos integrity destruction, wetland degradation, human disturbance activities, weakened water conservation function and overload of point source and non-point source pollutant, are the limiting factors impacting the ecosystem health of some evaluation unit in the Western Tiaoxi river watershed.