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Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (5): 81-93.DOI: 10.7522/j.issn.1000-694X.2021.00054

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Environment changes in the Hobq Desert since the Last Glacial Maximum

Xiaomei Zhang1,2(), Heling Jin1(), Bing Liu1   

  1. 1.Key Laboratory of Desert and Desertification,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    2.University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2021-03-28 Revised:2021-04-26 Online:2021-09-20 Published:2021-09-23
  • Contact: Heling Jin

Abstract:

How the deserts/sandy lands in the monsoonal margin region in northern China responds to climate change and its feedback are of important scientific significance for understanding the modern surface processes in arid and semi-arid regions and their future environmental evolution trends. The Hobq Desert is the only mobile and semi-mobile desert in the middle and east of the monsoonal margin region in northern China. The modern surface landscape is significantly different from the surrounding sandy lands (such as the Mu Us Sandy Land, the Hunshandake Sandy Land, and the Horqin Sandy Land). There are still many disputes about whether the Hobq Desert has the same evolution process as the sandy lands in the middle and east of the monsoonal margin region and when its wet period occurs since the Late Quaternary. The conclusions of regional aeolian deposition and lacustrine deposition records are obviously different, and there is a difference between the optimal period of humidity in the middle and late Holocene and the early and middle Holocene. Through the process of the probability density distribution (Probability Density Function, PDF) of the aeolian sedimentary age-lithology of the Hobq Desert and its comparison with paleoenvironment records of aeolian deposition and lacustrine deposition from the surrounding sandy lands, it is found that: the environment evolution process of the Hobq Desert is generally consistent with that of sandy lands in the middle and east of the monsoonal margin region since the Last Glacial Maximum. During 27.6-10 ka and the Late Holocene (2-0 ka), sand activity was strong and the climate was relatively arid; in the early Holocene (10-6 ka), paleosols began to develop, sand dunes were gradually fixed, humidity increased, and environmental conditions were improved; in the Middle Holocene (6-2 ka), paleosols developed extensively, sand dunes were fixed, and climate was obviously humid. The process of regional environmental evolution is controlled by both solar insolation in low-latitude and variations of ice volume in high-latitude.

Key words: Last Glacial Maximum, Hobq Desert, climate change, desert evolution, driving mechanisms

CLC Number: