Research on Succession and Rehabilitation of Submerged Macrophytes in the Process of Eutrophication of Gehu Lake

The submerged macrophytes is the basis of the shallow-water lake ecosystem,which could fix and remove nutrients of nitrogen and phosphorus and purify the water of the lake. The submerged macrophytes has being disappearing in the process of eutrophication of the Gehu Lake and the Gehu Lake became an algal lake from a macrophytic lake in this process with a sharp degradation of water quality and ecological functions. This paper summarized the characteristics of the succession of the submerged macrophytes and the affection mechanism on the water quality in the process of eutrophication of the Gehu Lake and proposed the plan of the rehabilitation of the submerged macrophytes,which were done based on the analysis and summaries of the monitoring data of water quality,the observation of the submerged macrophytes over the past 20 years,the test results of the impacts on water quality and the maintenance of biodiversity of submerged macrophytes in the Dahonggang of the Gehu Lake.