贾鲁河流域郑州段水域生态系统健康评估

Health Assessment of the Aquatic Ecosystem of Zhengzhou Part of the Jialu River Basin

为了确定贾鲁河流域郑州段水域生态健康的主要制约因子,以为水域生态系统修复提供参考,采用综合指标体系法,在环境保护部《流域生态系统健康评价技术指南(2013试行)》基础上,制定贾鲁河流域郑州段水域生态健康评估的指标体系,结合遥感解译、采样监测及实际调查数据,对区域内4个评价单元进行了水域生态系统健康评估。结果表明,贾鲁河流域郑州段水域生态健康整体处于"较差"水平,上游索须河和源头段水域生态健康状况优于中下游的市区段和中牟段,主要限制因子为河道连通性,其中市区段水质状况指数影响更显著;水域生态系统健康压力主要来源于水资源开发利用强度和生态需水保证率。贾鲁河流域郑州段水域生态修复应重点从补充生态需水、保障河道连通性和控制入河污染物3方面展开。

This paper analyzed the health of the aquatic ecosystem of Zhengzhou part of Jialu River Basin aimed to provide guidance for ecological remediation. Based on the guidelines provided by the Ministry of Environmental Protection for watershed ecosystem health assessment, we established an index system to assess the health of the aquatic ecosystems using remote sensing combined with survey and measurements. We divided the region into four units and assessed the ecological health of each one. The results showed that overall, the health of the aquatic ecosystem in this region was poor, and that the middle reach of the river was ecologically worsen than the upper reach. The main limiting factor to ecosystem health was the obstruction of the river courseand the deteriorated water quality of the river within the urban area. The pressure on the ecosystem health was due to the imbalance between available water resources and the ecological water demand. Hence, remediation of the ecological system of Zhengzhou part of the Jialu River should focus on ecological water supply, alleviating the obstruction to the river course and reducing contaminant loading.