Xu et al.: Comprehensive assessment of the water ecological security of the Xiangjiang River Basin based on physico-chemistry and organism indices - 4547 - COMPREHENSIVE ASSESSMENT OF THE WATER ECOLOGICAL SECURITY OF THE XIANGJIANG RIVER BASIN BASED ON PHYSICO-CHEMISTRY AND ORGANISM INDICES XU, X.1* – SHENG, D.1 – LI, G.1 – CHEN, X.2 – WANG, X.3 – XIAO, C.3 – GAO, X.4,5 – HU, C.1 1Hunan Institute of Water Resources and Hydropower Research Changsha, Hunan 410007, China 2Key Laboratory of Environmental Biology and Control, Ministry of Education Hunan University, Changsha 410007, China 3College of Hydrology and Water Resources, Hohai University Nanjing, Jiangsu 210098, China 4Hunan Provincial Academy of Science and Technology Consulting Co., Ltd. Changsha 410004, China 5Hunan Academy of Environmental Protection Science, Changsha 410004, China *Corresponding author e-mail:
[email protected] (Received 19th Oct 2018; accepted 28th Jan 2019) Abstract. The water ecological security of a river basin affects the vigorous growth of the regional economy and the healthy development of the ecological environment. Based on river physics, chemistry, and biological indicators, this study constructed a comprehensive assessment index system for the water ecological security of the Xiangjiang River Basin in China. The system consisted of 6 elements, and 18 indicators. This study used the analytic hierarchical process (AHP) to evaluate the water ecological security of the upstream, midstream, and downstream environments of the Xiangjiang River Basin. The results show that the overall ecological security of the upper and midstream portions of the Xiangjiang River Basin is relatively good, while the downstream section is at a general level.