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《Tropical Geography》 2012-01
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Ecological Effects of the Variation Process of Water and Sediment of Dongting Lake

LI Jingbao1,ZHANG Lei2,WANG Jian1,YU Guo1,SHUAI Hong1,CHANG Jiang1 (1.Hunan Normal University,Changsha 410081,China;2.Affiliated Middle School of Hunan Normal University,Changsha 410081,China)  
According to the measured hydrological data during 1951-2009 and field survey data,the contrast method is used to analyze the influence of the changes of water and sediment process on biological communities and eco-environment in the Dongting Lake.The results show that:1)The process of water and sediment acts as a wide range of ecologically supportive role on biological communities and eco-environment in the Dongting Lake,and the process of water and sediment is a controlling variable for the ecosystem;2)The development and expansion of varied vegetation marshland are promoted by continual siltation,which may lead to reducing the water area,weakening the regulation function of the lake and reducing the natural fishing grounds;3)The continuous emerging of all kinds of vegetation marshland and the fluctuation of water level not only can sustain the continuity of population and migration of microtus fortis,but also support the propagation and multiplication of oncomclania snail's(intermediate host of schistosome);4)The decrease of the amount of flow and sediment of the lake weakens the water purification capacities,reduces the capture production of the four major Chinese carps,reduces the quantity and varieties of migratory birds,decays the fish stocks,and substantially reduces the rare fish species.
【Fund】: 国家自然科学基金项目(41071067);; 湖南省重点学科自然地理学建设项目(2008―2011)
【CateGory Index】: X826
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