【摘要】 通过对毛乌素沙地东南缘的一处沉积剖面的粒度分析,揭示该区历史时期的环境变化过程。结果表明:毛乌素沙地历史时期环境一直处于退化之中,主要经历唐中后期和明后期的两次沙漠活化过程。剖面记录的这两次沙漠化与历史文献及考古发现可以相互印证,因此剖面结果对阐释历史文献的记载具有很好的补充作用,同时历史文献也验证了剖面结果的可信性。这两次沙漠活化使毛乌素沙地环境严重退化,尤其是明代后期发生的沙漠化是形成现代地表景观的主要原因。由于此次沙漠化过程与气候过程不一致,因此明末至今的沙漠化与人类活动相关。更多还原

【Abstract】 Based on the grain size analysis of the Baoningbu(BNB) section situated in the south-east of the Mu Us Desert,the authors investigated the processes and the causes of historical desertification of the desert.The results indicate that two phases of desertification,namely at the mid-to-end Tang Dynasty and at the end of the Ming Dynasty,are documented by the section.The two phases of desertification greatly made the environment of the Mu Us Desert deteriorate,especially for the second one,which formed the present landscape of the Mu Us Desert.The two phases of desertification are corroborated by historical records and archaeological data.Therefore the results are highly reliable.With a comparison of climate change,we suggest that the desertification occurring at the end of the Ming Dynasty was highly related to the human activities.更多还原