On the Water Pollution and the Preventing and Controlling Measures of Dongting Lake

In recent years,the water quality of Dongting Lake has been in medium-eutrophication.The main pollution indexes were TP and TN.The water pollution was very seriously,and the pollution types gradually transform from industry pollution primarily to multiplex pollution of industry,agricultural,living and the schistosomiasis medicine.From 2003,the proportion of city industrial pollution has been declined slowly,but the agricultural surface source pollution and living pollution coming from city continued to rise.To control the water pollution and prevent the eutrophication trend of Dongting Lake,certain measures should be done: to reduce and control the pollution resources such as industrial wastewater,domestic sewage and agricultural non-point source pollution;to mine the groundwater reasonably;to guaranteed the ability of adjusting the water by purifying sediments;to enhance the range of public participation,to build a united mechanism of wet-land protection and management in Dongting Lake.