The Analyze Of Dynamic Change And Cause Of Land Desertification Of The Zheng Xiang Bai Banner

Desertification is one of the most important environment problem in the world ,it threatening the human existence environment severely and becoming the important factor that is restricting the development of global economic and society .The researching area that Zheng xiang bai banner is located the south of the Hun shan da ke land and ecotone of the sandland and grassland , have the Fragile ecological environment, and it is the severe dasertificational area in our nothern country. In the paper, the study based on the three times landsat TM images data in 1990 ,2000 and 2006 , the landform in the study area, precipitation﹑air temperature﹑the number of population and the data of social economic in 1961-2005 , combine the fieldwork and technology of RS and GIS ,using the matrix analyze the status and dynamic change of the desertification in the studying area. And in the paper using the Markov model to predict the the trend of desertification and analyze the cause and dynamic change of desertification by the quantitive and qualitative mathod and discuss the influence of natural factor and human activity on the desertification.The research indicates, all kinds of desertification in the whole area is increased in 2000 compare with 1990, in the among ,the area of light degree and heavy desertification is increased , the area of the middle degree desertification and serious degree desertification is decreased. The area of the desertification basically is increased , in the that , the area of the heavy desertification is decreased , the area of the light degree desertification is not evident ; the area of the middle degree desertification and serious degree desertification is increased in 2006 compare with 2000. As the result of calculation from the Markov predict, that the area of the light degree and heavy desertification will decrease , the area of the middle degree desertification and serious degree desertification will increase in the future 30 year.According to study, because people increase rapidly, assart excessively and over loading lead to soil pressing over loading, adding climate drought precipitation distribute odds and change rate great,which lead desertification is extending in Zheng xiang bai banner. It is very important advance prevention and cure strategy, keep desertification extending advance.