The Comparison between the Historical and Current Vegetation in Nansi Lake Area

Nansi Lake is the largest fresh water lake in North China. In the recent fifty years, the wetland ecosystem of Nansi Lake has severely degraded and needs to be restored urgently. With the investigation (totally 39 sites) all around the Lake, the current status of plant species composition and the geographic distributions of the wetland vegetation were studied. The historical changes of the dominant species in Nansi Lake were studied using the data of five typical years chosen from the last fifty years. Results showed that the vegetation had changed significantly in the recent fifty years, and the current vegetation was fragmented because of human disturbance and confront the risk of plant invasions. In this study, the target, strategy and measures of wetland restoration of Nansi Lake are discussed. To meet the demand of restoration in Nansi Lake wetlands, some suggestions are brought out about the ecological security, the restoration species choosing and the research direction.