南四湖湖泊湿地生态健康评价

Assessment of Wetland Ecosystem Health in the Nansihu Lake

通过对南四湖湿地生态系统的现状特点的诊断分析,建立了湿地自身组织结构、整体功能和外部社会经济环境3个亚类21个指标的生态系统健康评价指标体系,并设立了4级评价等级,以模糊综合评判模型作为研究方法,对南四湖湿地生态健康状况进行评价,南四湖湿地生态系统的健康度为0.535。表明南四湖湿地生态系统处于亚健康状态,其主要病因在于工农业及生活废水污染、水产养殖及泥沙淤积、人工围垦和修筑桩台等活动。随着南四湖流域水污染治理与管理力度不断加大,湿地生态系统健康状况已有所好转。

First, we diagnose and analyze the present condition characteristics of the wetland ecosystem. Then, we design the index system to evaluate the healthy condition of the wetland ecosystem. The index system includes three secondary indexes： the wetland itself organization structure, whole function and the exterior social and economic environment. It has 21 indexes totally. We establish four class evaluation grades. Finally, we assess the Nansihu Lake ecosystem with the Fuzzy synthetically judgment model. The conclusions are as follows： the ecosystem of Nansihu Lake wetland is in sub health, the main reason of which lies in over land reclamation and aquaculture around the lake and so on. At the same time, there is a lot of pollution in the process of industry and agriculture.