基于PSR的围圩养殖区湖泊湖荡群水生态系统健康评价

以典型围圩养殖区江苏省里下河腹部地区的41个湖泊湖荡为研究对象,分析筛选了围圩养殖对生态系统影响的主要指标,基于PSR方法评价了湖泊湖荡群的水生态系统健康状况.结果表明,选取的养殖面积占比、斑块密度及退圩还湖政策规划等指标能够有效反映区域的围圩养殖特色,全面表征围圩养殖对生态系统压力、状态、响应的影响.评价结果显示,里下河腹部地区41个湖泊湖荡中综合指数等级健康的占比4.9%,亚健康的占比87.8%,不健康的占比7.3%.研究结果可为围圩养殖区湖泊水生态系统健康评价、退圩还湖及水生态修复规划提供重要的技术方法.

Health assessment of lake cluster based on PSR model in polder aquaculture area

This study selected 41 lakes in the Lixia River hinterland of Jiangsu Province as the study area. Considering the impact of enclosure aquaculture on the ecosystem, a total of 14 evaluation indicators was chosen, and an ecosystem health assessment indicator system based on the "pressure-state-response" (PSR) model was applied to evaluate the ecological health status. The results showed that the selected indicators, such as the proportion of aquaculture area, patch density, and the policy about conversion of enclosure aquaculture to free water surface, can effectively reflect the characteristics about enclosure aquaculture of the region and fully characterize the pressure, status and response of enclosure aquaculture to ecosystem. The lakes health evaluation results showed that among the lake cluster 4.9% were in the healthy status, 87.8% were in sub-healthy status, and 7.3% were in unhealthy status. This study can provide a reliable reference for lake ecological health evaluation and regional lake restoration in other enclosure aquaculture areas.