Abstract:Based on the remote sensing information on the soil and water loss and the data of land resource in 1980s and 1990s, the soil and water loss in Miyi County is showing in a worsened situation, the area and the strength of soil and water loss are increasing, cultivating on the steep slope land, cutting down the forest, destroying the plant cover and discarding soil in the process of development and construction are the major factors increasing the soil and water loss. On the countermeasures to control soil and water loss, the execution of the law on the control of soil and water loss should be strengthened, the law on the control of soil and water loss should be consummated, the control of soil and water loss should be carrying out the integrated conservation of the small basin as the kernel, reasonably using and protecting the steep slope land and enhancing the efficiency of protecting the natural forest through strengthening the construction of rural energy resources.

Abstract:The study on land use change is a frontier and hotspot in global environmental change study. Taking land use change of Xiji County in 1980s as an example, the methods of researching land use change are discussed. The result shows that applying land use maps with different scale and different land use classification system studies land use change is feasible. Main processes of operation are as follows: (1) conversion of land use classification system; (2) spatial overlay analysis; (3) determining probability conversion matrix of land use change; (4) attribute database analysis.