SUGGESTION OF SANDY DESERTIFICATION IN NORTH CHINA BASED ON REMOTE SENSING TECHNOLOGY

According as the rule of human activity influence on surface components of crust,we partition the sandy desertification land management area in North China into agriculture surrounding sandy desertification,stockbreeding and agriculture interleaved sandy desertification and grassland stockbreeding sandy desertification.Using MSS satellite image data in 1975 and ETM image data in 2000 as remote sensing information source,under the support of MAPGIS system,assisted by human operation we did the classification of change type of sandy desertification,and developed the change type of sandy desertification distribution map in 1975 and 2000 of the workaround.Based on the change range of sandy desertification land we plot out the type change of sandy desertification land. Through the overlapping analysis of type change of sandy desertification land in 1975 and 2000,we studied the dynamic change of sandy desertification in North China in the last 25 years,combined with the feature of nature condition and human activity of different area of sandy desertification land,we tabled a proposal of sandy desertification land management and control.