内蒙古浑善达克沙地近五千年内沙漠化过程的研究

STUDY ON THE SANDY DESERTIFICATION PROCESS OF HUNSHANDAKE SANDY LAND IN RECENT 5000 YEARS

本文通过对历史气候与地层剖面的综合分析,研究了浑善达克地区近5 000年内沙漠化的正、逆过程,提出该地区的沙漠化发展过程是一个以气候波动为主导作用的自然过程。

There are some different concepts about the origin and development of sandy desertification in the historical periods. A comparison method between climatic variation and stratum profile was used for studying the historical processes of sandy desertification in this study. The analysing results on climatic variation in historical periods show that there was a series of dry and humid changes alternately. The Yaoshitu profile in hunshandake includes 3 layers of dark sandy soil and 3 layers of yellow aeolian sand,which indicates that the Hunshandake sandy land has experienced 3 stages of the stabilized dune and mobilized aeolian sand respectively,and the present situation is in the third mobilizing aeolian sandstage since recent 5000 yesrs. The changes of sandy desertification process and climatic changes took place at the sametime,so it is considered that the historical processes of sandy desertification in Hunshandake sandy land were mainly controlled by climatic variations.