摘要
干旱地区的沙漠化主要发生在内陆河流下游，沙漠化过程的途径主要有就地起沙、风蚀绿洲、流沙入侵、洪积物掩埋绿洲４种，前两者最重要。由于绿洲水资源的移动和重新分布而导致绿洲的转移过程，并不一定意味着绿洲的缩小或消失；只要大的气候环流形势和流域的总水量无大变化，则其绿洲总面积就不致发生大的改观，沙漠化土地在一定条件下是可以逆转的。
The processes of desertification in dry regions have occurred mainly in the lower reaches of rivers. The channels of the processes of desertification have principally 4 sorts: producing sands on the spot, wind erosion on oases, drift sand intruding and flooded gravel burying oases. The substance of the processes of desertification is a sort of process of the oases transference that had happened owing to the moving and redistribution of resources of water of oases by virtue of mankind's un reasonable action of land exploitation. Along with the processes of transference, original oases had shrurk and new oases had emerged. The desertification had occurred in one place, and new oases had been formed probably in other areas. The oases are principally the outcome of resources of water. So long as there are not great changes in atmospheric circulation and total amount of water in the valley, the general area of the oases will not alter greatly in the valley. Desertified land can reverse under definite circumstances, but the reverse in dry regions is nearly impossible.
出处
《地理科学》
CSCD
北大核心
1999年第3期211-215,共5页
Scientia Geographica Sinica
基金
国家自然科学基金
国家教委"九五"规划重点项目
关键词
沙漠历史地理学
理论问题
河西走廊
沙漠化
Historical geography of desert
Theoretical problems
Hexi Corridor
