Study on Land Use/Cover Change and Its Driving Forces of Sushui River Watershed During the Last 18 years

Land use/cove change(LUCC) situation and its driving forces in Sushui River watershed had been investigated by monitoring an analytical research of phases of Landsat TM data of 1990 and 2008,supported by ENVI and ArcGIS,and by employing the land resource quantity change model,the land utilization transfer matrix and the land utilization degree change model to study the land use tendency and driving forces of LUCC for the period of 1990～2008.The result indicated that the cultivated land,build-up land,grassland and forestland area had presented a rapid growth tendency,while water area and moorland had an opposite tendency.Sole dynamic degree of land use had a little change and the sequences of land use dynamic degree were build-up landmoorlandgrassland and forestlandwater areacultivated land.Comprehensive dynamic degree of land use was 15.83,belonging to land-use fast change type.Integrated index of land use change was 58.37 and the land use change rate was 0.23.Land development degree of utilization was strengthened in this area,which was the result of the rapid development of economy and society.Population,policy as well as urbanization economic growth were the main driving factors of the land use/coverage in Sushui River watershed.