The Desertification Area Of Songnen Plain Study On Land Use/Cover Change And Driver Factors For Example Qianan County Of Jilin Province

The paper has put The desertification area of Songnen Plain in China Northeast ,base on the Qianan County of Jilin Province as research region, Taken the Landsat TM/ETM remote sensing image of 1995,2000,2007 of Qianan County as the main database source. The thesis has obtained the the three Periods'data of the land use and cover changes in 1995 2000and 2007 by compounding artifieial color by 4 3 2 bands standard mode and adopting human-computer interaction visual interpretation estimation.Then analyzed the Qianan County land use / cover change, and qualitatively analysis of the changes in the main driving factor. The study area is typical of northern China ecotone and this study area ecosystem is vulnerability and sensitivity of the significant. Hence, its land-use change have significance for revealing ecologically fragile and sensitive areas .The study content including:1,Dynamic degree of land use, land-use degree index to analyze the study of the various land use / land cover change in the number, change rate and land-use process. From 1995 to 2007,the Qianan County land-use changes in the characteristics of the total were as follows: Drastically increased the amount of cultivated land, a significant eduction in forest , grassland and water area, construction sites, wetlands increased .2,Land-use transfer matrix analyze the study of the various land use / land cover changes and the number of metastasis. Land-use transfer matrix is to calculate the land-use type conversion methods, the regional land-use change in the number basis of the analysis.The use of GIS vector overlay analysis, the two interpretation maps of remote sensing of land can be land-use transfer matrix. In 2007, the area of cultivated land is 22.40 x 104hm2, is mainly transformed from woodland and grassland, water, unused land. Construction land is mainly transformed from grassland, unused land, agriculturalland .3,The driving factors of land use / cover changes in the QiananCounty will be revealed by the qualitative analysis methods . The land-use change research will be more comprehensive understanding of land-use change in Qian'an County. Cultivated area increased driving element is mainly per capita GDP, the second industrial output; Grassland area reduction element is mainly population factors; Building land area increased driving factors is mainly per capita GDP and investment in fixed assets, and rural per capita residential area.