the Ministry of Science and Technology of China (Grant No. 2006CB403205);the National Natural Science Foundation of China (Grant Nos. 90610037, 40571158 and 40721002)
Three cascade reservoirs,built in different periods of time in the Wujiang drainage basin,were inves-tigated in this study.Samples were taken at the surface and also at 20,40,60,80 m depths in front of the dams in Apr...