Evaluation and Analysis of Eutrophic Levels in Nansihu Lake

Referring to water quality monitoring data of Nansihu Lake in August, 2008, the state of eutrophication was evaluated according to TLI method, with the indices of Chl.a, TP, TN, SD and COD
_Mn
. The results show that Nansihu Lake has been in eutrophic state, in which Nanyanghu Lake is mesotrophic state. The causes were analyzed from all aspects of the situation which provide the basis for control of the lake eutrophication.