The Analysis of dynamic change of wetland in Liao River Basin based on RS and GIS

Based on the GIS technology, ETM date of 2000 and CBERS date of 2007 have been used as main data source in this paper. The dynamic degree and transfer matrix of wetland in the study area have been analyzed in order to clear the dynamic change of the wetland in liaohe river water system area in recent years. The results show that the wetland area in liaohe river region during 2000-2007 is obviously the volatility of the whole the increasing trend,the river area and offshore area and coastal wetlands area have been decreased,the areas with decreased river area is mainly distributed in the north of liaohe river region and central region. The areas with increased artificial wetland is mainly distributed in the north centre of liaohe river region. The increase of artificial Wetland and swamp meadow wetland area mainly comes from the transformation of non wetland area,the wetland types and changes of areas also have some correlation among the temperature and precipitation.