Analysis On Community Characteristics And Dynamic Change Of Liuwanlin

Liu Wanlin, an unique landscape of Mu Us desert, is mainly distributed in lowland and the edge of bottomland. There are Salix chcilophila,Hippophoe rhamnoides, Salix psammophila and undergrowth herb which constitute vegetation types.Meanwhile, Liu Wanlin bears a function of maintaining biodiversity, wind prevention and sand-fixation, regulation climatic and providing natural products and so on. But,in the past few decades, the area of Liu Wanlin reduced which exerts an important influence on the ecological environment and the living and production of Nomads. So the author of the thesis studies on flora, distribution pattern and dynamic change of Liu Wanlin. The result are as follows:1. There are 34 families 98 genera 132 species, the most important life style is perennial plant,moistrur ecotype is mesophyte and temperate plant.2. It is temperate clear zonal distributing and moisture and mechanical composition is the important factor for Distribution pattern of Liu Wanlin With the water level falling, herb community diversity index, aboveground biomass and soil organic matter content will show a downward trend. 3. From 1986 to 2007, the Liu Wanlin study area was reduced by 421.57km2. In this study area,192.57 km2 of Liu Wanlin transfered into saline lowlands. This is caused by the climate change and human activities. From 1986 to 2007, the average temperature in the study area showed an increasing trend, while the growing season's downward in summer showed a reducing trend.There is no enough rainfall in Liu Wanlin.Consequently, reclaiming farmland and planting around Liu Wanlin changed its hydrological conditions, resulting in habitat drought in Liu Wanlin.KEYWORD:Mu Us;Liu Wanlin;Dynamic changes...