CHEN Jingan1, WANG Jingfu1, YU Jia1,2, ZENG Yan1, YANG Haiquan1,2, ZHANG Runyu1, GUO Jianyang1
(1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang ,550081, China;
2.University of Chinese Academy of Sciences, Beijing 100049, China; )
Abstract: Southwest China is rich in water resource. With persistent implementation of clean energy electricity transmission from west to east, the urbanization construction, water conservancy and hydropower development strategy, and number of reservoirs in Southwest China will continue to be refreshed. However, contradictions exist between rapid growth in reservoir number and increasingly prominent eco-environmental problem. Reservoir has unique geologic background and eco-environmental characteristics as follows. 1) With man-made attributes, the water environment and ecological system evolution starting point are different from natural lakes; 2) Counter cyclical artificial regulation of water level leads to ecological function degradation of Hydro-Fluctuation Belt; 3) Seasonal stratification controls the key physical, chemical and biological processes in these sub-deep water reservoirs; 4) Sediment is rich in organic matter and nutrients and thus has notable potential release risk; 5) Cumulative effect of the material cycle has an important influence on water environment and ecological security of reservoirs and downstream water; 6) Water eutrophication and heavy metal pollution are tightly interlocked; 7) Multi-interface function controls the material cycle and biological processes. Research on eco-environment of sub-deep water reservoir is far behind that of the shallow lakes in East China. It is desirable to carry out intensive study on evolutionary process and inherent law of the eco-environment in southwestern reservoirs, so as to establish effective water environment theory and treatment technology system, providing strong scientific support for eco-environment protection and treatment.
Keywords: reservoir; eco-environment; sub-deep water; Southwest China
EARTH AND ENVIRONMENT Vol.45, No.2, Tot No.316, 2017, Page 115-125
