Abstract:

With an analysis of the hydrologic processes and landform of Poyang Lake，wetland types were classified by using 3S technology，the habitats of wetland plants，structure of major plants community and its distribution rules were investigated in this paper.Poyang Lake has complex system of wetland plants and is extremely rich in biodiversity.The wetland plants are colonel reproduction of plants using roots or stems as the the main reproductive organs，so the distribution pattern of plant communities presents the main features of the cluster distribution.In microscale，the plant communities distribute based on the moisture gradient by the influence of lake′s landform，the elevation，the water lever and exposed time of the beaches.In landscapescale，the distribution of plant communities present community mosaic structure by the influence of soil moisture，groundwater depth and soil structure.In microcosmicscale，the distribution of plant communities presents community complex structure in some regions by the influence of the microtopography and soil nutrient.Wetland plant′s extreme sensitivity to moisture gradient leads the structure to become mutability and fragility.In recent years，the longlasting low water lever of Poyang Lake causes damage to ecosystem.