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Arid Land Geography ›› 2024, Vol. 47 ›› Issue (11): 1876-1886.doi: 10.12118/j.issn.1000-6060.2024.003

• Climatology and Hydrology • Previous Articles     Next Articles

Climate change and desert evolution of Horqin Sandy Land in the mid-late Holocene

LIAO Wanyue1(), JIE Dongmei1,2,3,4(), GAO Guizai1,2,3,4, WANG Jiangyong5   

  1. 1. School of Geographical Sciences, Northeast Normal University, Changchun 130024, Jilin, China
    2. Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, Changchun 130024, Jilin, China
    3. Institute for Peat and Mire Research, State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, Changchun 130024, Jilin, China
    4. Institute of Grassland Science, Key Laboratory for Vegetation Ecology, Ministry of Education, Changchun 130024, Jilin, China
    5. College of Geography and Remote Sensing Sciences, Xinjiang University, Urumqi 830017, Xinjiang, China
  • Received:2024-01-03 Revised:2024-02-20 Online:2024-11-25 Published:2024-12-03
  • Contact: JIE Dongmei E-mail:liaowy257@nenu.edu.cn;jiedongmei@nenu.edu.cn

Abstract:

The Horqin Sandy Land in Inner Mongolia, China, known for its ecological fragility and climate sensitivity, is highly responsive to climate change. This study aims to elucidate the evolutionary processes of the sandy terrain and its response to climatic variations, establishing a theoretical foundation for the future protection and management of sandy lands. The research focuses on an eolian paleosol profile situated on the northeastern periphery of the Horqin Sandy Land. Through grain size analysis, loss on ignition, and phytolith analysis, the study reconstructs past climate changes and sandy land dynamics since the mid-Holocene. The results identify distinct phases of stability and expansion in the Horqin Sandy Land between 5700 and 2400 cal a BP, highlighting a strong correlation between eolian activity and climate fluctuations. From 5700 to 4800 cal a BP, the sandy land remained predominantly stable, coinciding with an intensified East Asian summer monsoon that fostered a warm and moist climate. This stability was followed by gradual expansion between 4800 and 3900 cal a BP, as the weakening summer monsoon led to colder and drier conditions that increased eolian activity and sandy land spread. The period from 3900 to 3300 cal a BP marked a return to stability and contraction, driven by a warmer and more humid climate conducive to soil development. However, from 3300 to 2400 cal a BP, colder and more arid conditions prompted renewed sandy land expansion, ultimately leading to the burial of the paleosol layer with sand. In summary, the evolution of the Horqin Sandy Land during the middle to late Holocene is closely linked to climate variations driven by the East Asian summer monsoon. These findings underscore the need for careful consideration of climate impacts in the development of policies for sandy land management.

Key words: Horqin Sandy Land, climate change, desert evolution, phytolith anlysis, grain-size anlysis