Abstract: Based on the SPOT-5 RS image data in 2004 and using ERDAS and ArcGIS to pick up landscape classification information,this paper studied the landscape fragmentation of the surrounding areas of Tongguling National Natural Reserve,and the ecological stress of this fragmentation on the Reserve.PD,LPI,AWMSI,AWMPFD and PSCOV landscape indices were selected to analyze the landscape fragmentation,and ArcGIS spatial analysis was used to explore the ecological stress.The results showed that landscape fragmentation was serious in Tongguling area.In the 1 km buffer zone outside the Reserve,coast-protected forests were destroyed,mangrove forests were decreasing,and high position aquaculture ponds were constructed in large areas.These environmental problems threatened the healthy and sustainable development of the Nature Reserve.

Key words: Fuxian Lake, Constructed wetland, Phosphorous removal efficiency