By the investigation of water quality and phytoplankton community inCaohai lake, estimated the eutrophication degree, and discussed the relationamong eutrophication factors in Caohai lake.

• 通过对草海水体现状、浮游植物种组现状的调查,评价水质现状及湖泊的富营养化程度;并通过数据分析探讨草海富营养化影响因素之间的关系。