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Preliminary reconstruction of the desert and sandy land distributions in china since the last interglacial period

Science china Earth sciences 2004年第Z1期47卷 89-100页

作者： chen huizhong, su zhizhu,{2., cold and arid regions Environmental and engineering research institute, chinese academy of sciences, lanzhou 730000, china State Key {12. of Loess Quaternary Geology, institute of Earth Environment, chinese academy of sciences, Xi’an 710075, china institute of Loess Plateau, Shanxi University, Taiyuan 030006, china Key laboratory of desert and {2. Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou China State Key laboratory of Loess Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi’an China institute of Loess Plateau Shanxi University Taiyuan China

The desert and sandy land are the products of arid climate. The spatial distribution of modern deserts and sandy land in china and their relation to climate show following characteristics: arid and hyper-arid desert zones, at isohyet of less than 200 mm, are dominated by mobile dunes; semi-arid steppe and arid desert steppe with the precipitation between 200?00 mm, are dominated by semi-fixed and fixed sand dunes; the precipitation of sub-humid forest grassland and humid forest zones with scattered fixed sand land is higher than 400 mm. With this as reference, in combination with considerable amount of paleoclimatic data in desert regions and adjacent regions, the distributions of desert and sandy land in china during the last intergla-cial period, the last glacial maximum (LGM), and the Holocene megathermal, were preliminarily reconstructed. The results compared with that of today show that the distribution of desert and sandy land in china was greatly dwindled during last interglacial period, and the mobile dune area was about two-thirds of that of today's, but greatly expanded during LGM. However, the dwindling area of desert and sandy land in the Holocene megathermal was smaller than that in the last interglacial period. The forcing mechanism was mainly related to the changes of East Asian winter and summer monsoon, south-northward swing of the westerlies and the variations of the Qinghai-Tibet Plateau monsoon intensity caused by global climate changes during the cold and warm intervals since the last interglacial period.

关键词： the glacial-interglacial period, desert, sandy land, spatial distribution.

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