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《Scientia Geographica Sinica》 2014-06
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The Evolutional Characteristics of Water Environment of Chagan Lake Wetland

LI Ran-ran;ZHANG Guang-xin;WEI Xiao-hong;LIU Yan;ZHANG Lei;SUN Shuang;Key Laboratory of Wetland Ecology and Environment,Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Songyuan Branch,Hydrology and Water Resources Bureau of Jilin Province;  
Chagan Lake wetland is an important ecological barrier of the western Jilin Province. Analyzing the evolutional characteristics of the water environment will provide a scientific basis for the protection of the water environment security. The evolvement of water environment was comprehensively studied through analyzing the water level data from 1982 to 2011 and the water quality data in 1985-2011. Carlson trophic state index(TSI) and the fuzzy comprehensive evaluation method were used to assess the eutrophication level and the water quality. The results showed the water level was recovered and stabilized at 129.8-130.3 m after the operation of the channel transferring water from Songhua river to Chagan Lake. Water salinization, eutrophication,organic pollution were mitigated and the water environment improved considerably in the late 1980s, but the trend of alkalization and organic pollution has became serious since 2006 and the water quality evolved fromⅢ category to IV category. The trend of eutrophication has been relieved since 2006.Agriculture drainage has relieved the water salinization and hasn't aggravated the level of eutrophication in Chagan Lake temporarily.The water quality of Chagan Lake is accross-affected by terrestrial emissions in the catchment, endogenous releases and hydrological regimes and exhibits a remarkable phosphorus limited middle nutrition. Sewage and animals' feces pollution should be controlled to protect the water environment health.
【Fund】: 吉林省重点科技攻关项目(20130206012SF);; 水利部公益性行业科研专项经费项目(201401014);; 国家重点基础研究发展计划(973)项目(2010CB428404)资助
【CateGory Index】: X143
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