Sandy Land of West Northeast China Plain lies in the eastern fringe of huge sandy belt of middle latitude in Eurasia Continent and is also the eastern fringe of sandy desertificartion land. Now sandy desertification landscape becomes very obvious

and we are very anxious for this situation. According to TM data

the landscape patterns and desertification features are analyzed and the mechanisms of sandy desertification process are analyzed. According to the VI index of desertification degree

the dynamic change of desertification is detected based on NOAA/AVHRR data and its driving forces is analyzed. It can be concluded that desertification monitoring should be conducted based on commonly used multi-resolution RS data

and there should be a relatively uniform criterion to data

types

grades and methods for monitoring desertification so that the results can be compared all over the world. The regional differences are very obvious in landscape patterns

desertification degree

development modes in this region. In 1990s sandy desertification developed rapidly and the regional differences which are consistent with the population growth

irreasonable cultivation and overgrazing are great.