淮河流域河流生态系统健康评价.doc

A bioindicator assessment framework of river ecosystem health and the detection of factors influencing the health of the Huai River Basin, China Jun Xia1, Yongyong Zhang2,*, Changsen Zhao3, Stuart E. Bunn4 1State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, 430072, China 2Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China (Corresponding author). E-mail: zhangyy003@. 3State Key Laboratory of Remote Sensing Science, Jointly Sponsored by Beijing Normal University and the Institute of Remote Sensing Applications of Chinese Academy of Sciences, Beijing 100875, China.School of Geography, Beijing Normal University, Beijing 100875, China 4Australian Rivers Institute, Griffith University, Brisbane, Queensland, Australia Abstract River ecosystem health assessments are a hot topic in global water resources management. The Huai River Basin is a representative basin faced with serious environmental problems due to high water pollution and numerous water projects. Comprehensive investigation of the factors affecting river ecosystem health is an urgent precursor to the successful management of the Huai River Basin. Based on a series of aquatic ecosystem indicators, monitoring and standards, such as phytoplankton, zooplankton and benthic macroinvertebrate data, an assessment framework of river ecosystem health is proposed using a multi-step gray correlation evaluation method. Environmental impact factors including climate, land cover, edaphic factors, hydrology, water projects and water quality were identified using the Kruskal-Wallis test and distance-based redundancy analysis method. The ecosystem was found to be sub-healthy with 44% (31/71) of sites in a healthy condition, 51% (36/71) sub-healthy and 5% (4/71) unhealthy. Climate and hydrology were the dominant factors that together contributed 37.5%