从晚更新世以来我国沙漠的变迁看干旱区沙漠化问题

通过野外调查研究,作者提出我国东部干旱地区的沙漠早在有史记载以前的第四纪地质时期就已存在.晚更新世以来沙漠几经流沙(?)半固定、固定沙丘一系列正、逆变迁过程.人类历史时期以来出现的沙漠化,只是沙漠长期演变过程最近经历的一个发展阶段;沙漠化是自然因素和人为因素共同作用的结果,且总的看来,自然因素是第一位的.在全国干旱—半干旱区范围内沙漠的变迁和沙漠化的形成,在时间上是可以对比的,基本上是同步的.

ON SANDY DESERTIFICATION IN ARID REGIONS OF EAST CHINA

Survey and research on field, show that shad deserts in the arid and semiarid regions of the eastern part of China have existed since the beginning of Quaternary far before the human recorded history. A series of changes either forward or reverse from wandering sands to semifixed and fixed dunes have occurred in the sand deserts for several times since the Late Pleistocene. The sandy desertification in the recorded history of mankind is only a recent stage in the long process of development of the sand deSert,The sandy desertification results from the effects of natural factors and artificial ones. In genaral, the former is the prime. The formations and migrations of the sand deserts in the arid and semiarid regions in China occurred and developed synchronously in principle and can be compared respectively in chronogenesis.