乌江上游梯级水库水体富营养化研究

以乌江上游洪家渡、东风、索风营和乌江渡4座梯级水库为研究区域,于2007年开展了现场监测和调查,分别对4座水库富营养化状况和影响原因进行初步研究。结果表明:洪家渡水库枯水期为贫营养状态,丰水期为贫-中营养状态;东风和索风营水库枯、丰水期均为中营养状态;乌江渡水库枯、丰水期均为中-富营养状态。自上游至下游梯级水库水体富营养化程度趋于严重;梯级电站大坝阻隔引起的水动力条件变化,N、P等营养盐输入条件,网箱养殖,日照和水温条件均对库区富营养化状况产生了重要影响。

Eutrophication in upstream cascade reservoirs of Wujiang River

Field monitoring and investigation of the Hongjiadu,Dongfeng,Suofengying,and Wujiangdu cascade reservoirs were carried out,and the status and influences of eutrophication were studied in 2007.The results showed that the Hongjiadu Reservoir had a low level of nutrients in the dry season,and a low to medium level of nutrients in the flood season;Dongfeng and Suofengying reservoirs had a medium level of nutrients both in the dry and flood seasons;the Wujiangdu Reservoir had a medium to high nutrient level both in the dry and flood seasons; and the degree of eutrophication tended to increase from upstream to downstream.The change of hydrodynamic conditions due to the cutting off of the dam,the inputs of nitrogen and phosphorus,net cage fish farming,sunlight,and water temperature most affected the reservoir eutrophication.