Analysis for Plant Community Characteristics and Species Diversity of the Floodplain Wetland in the Xilin River

This paper analyzed plant community characteristic and species diversity of floodplain wetland in the Xilinhe river basin by the species composition,life-form,the type of water ecology,floristic composition and community diversity. It indicated that some characteristics of floodplain wetlands in the Xilin river basin were different from the typical wetlands and grasslands in the following aspects:( 1) The floodplain wetland vegetation was dominated by herbs,and the constructive species were different from typical wetland communities and grassland communities.( 2) The floodplain wetland plant ecological type groups were dominated by mesophytes and hydrophytes,but no aquatic plants,which was different from the typical wetland,meadow steppe and typical grassland.( 3) The diversity index,uniformity index and richness index of floodplain wetlands had the similar trend from southeast to northwest.( 4) Diversity of wetlands and richness index were Lower than the meadow steppe but higher than typical steppe.( 5) The floodplain wetlands plant community was degraded wet meadow,and also was a degeneration of transition type between typical wetlands and typical grasslands. 6tabs.,28refs.