５０万ａ来沙漠—黄土边界带的环境演变〔1〕
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增大字体[35] 丁仲礼，余志伟.第四纪时期东亚季风变化的动力机制. 第四纪研究，1995，（1）：63—74。
ENVIRONMENTAL EVOLUTION OF THE DESERT—LOESS
TRANSITIONAL ZONE OVER THE LAST 0.5Ma
Abstract
Besed of studying the sand—loess—palaeosol series of Shimao profile,which is located in the desert—loess transitional zone of north China, the Mu Us Desert evolution and the climatic flunctuations over the last 0.5Ma have been discussed. Our result indicated that:
1. According to the sedimental records of Shimao profile,the oldest aeolian sand of desert—loess transitional zone formed at 0.5Ma B. P., so this probably means the earliest occuring time of Mu Us desert.
2. The evolution of Mu Us Desert is controlled by the Quaternary climatic oscillation, and underwent changes from desert to non—desert or non—desert to desert. During the past 0.5Ma, at least 13 times of desert extension occurred, which are inferred by the 13 palaeoeolian sand layers of Shimao profile.
3. The stratigraphic sequence of the desert—loess transitional zone can be correlated with that of the Loess Plateau, but shows more sensitive to the past climatic changes: the sand layers sandwiched in glacial loess sediments and the loess or sand layers interbedded in interglacial palaeosols,all suggest that the sedimental successions in the transitional zone have a high resolution potential for recognozing not only the glacial—interglacial stages but also the within—stage climaticfluctuations.
Key words: desert—loess transitional zone; palaeoclimate; environment change
注释：
〔1〕国家自然科学基金资助项目。
〔2〕现在中国科学院广州地球化学研究所从事博士后研究。
〔3〕丁仲礼， 中国黄土土壤地层学与气候地层学研究与划分（中国科学院地质研究所博士学位论文），1988。
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