PRECIPITATION CHANGE AND DESERTIFICATION IN THE REGION OF NORTHERN SHAANXI AND ORDOS
Fang Xiuqi (Department of Geography)
It is demonstrated that recent drought is the factor more importent than the activities of humanbeings that bring about the desertification in the re- gion of Northern Shaanxi and Ordos. The study of the precipitation change from 1959 to 1984 in this area show that the expanding of desert in this area is associated with the drought tendency. Along with the trend of deser- tification, there are changes of other components of physical environment, such as the deteriorating of grassland, the decreasing of runoff and sand dis- charges, and the shrinking of the lakes. The interchanges of desertification and nondesertification, loess deposition and formation of paleosol, farming and stock raising that happened in the prehistoric age and the early stage of history in this region, further proved that it is the climatic change and not the human activities which is the most important factor that induced the change of environment in this region.