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Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (5): 85-96.DOI: 10.7522/j.issn.1000-694X.2023.00021

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Holocene climate change recorded by paleosoil profile in Hulun Buir Sandy Land

Yanzhuo Zhao1(), Yuanyun Xie1,2(), Chunguo Kang3, Yunping Chi2, Lei Sun1, Peng Wu1, Zhenyu Wei1   

  1. 1.College of Geographic Science /, Harbin Normal University,Harbin 150025,China
    2.Heilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regions, Harbin Normal University,Harbin 150025,China
    3.Geography Department,Harbin Institute,Harbin 150086,China
  • Received:2022-12-16 Revised:2023-03-07 Online:2023-09-20 Published:2023-09-27
  • Contact: Yuanyun Xie

Abstract:

Sand-desert is an important geological archive carrier in arid and semi-arid regions, recording rich climate evolution and desert changes, especially in Hulun Buir Sandy Land, located in the East Asian temperate monsoon region, which contains rich information about the East Asian monsoon and human activities. However, due to the impact of sand dune mobility and the lack of research methods, little is known about the climate information of Hulun Buir Sandy Land since the Holocene. Therefore, based on the two typical aeolian sand-paleosol sedimentary sequences in Hulun Buir Sandy Land, this paper has carried out multiple indicators such as grain size, magnetic susceptibility, color, geochemistry and TOC analysis, and combined with lithological characteristics, reconstructed the climate evolution history of Hulun Buir Sandy Land since the Holocene. The results show that the fine particle composition, magnetic susceptibility, CIA, Rb/Sr and TOC of the paleosol layer in the two sections are high, while (CaO+Na2O+MgO)/TiO2 and brightness are low. In addition, there are two obvious change trends in the age stages of 6 356±31-2 235±51 cal. a BP and 1 620±42-498±17 cal. a BP, indicating that the climate of Hulun Buir Sandy Land is reversed to the warm and wet direction, and the transition from the aeolian sand layer (dry and cold climate) to the paleosol layer (warm and wet climate) is gradual, while the transition from the paleosol layer (warm and wet climate) to the aeolian sand layer (dry and cold climate) is sudden change. By comparing with the compilation of paleosol ages in Hulun Buir Sandy Land, the paleosol development ages studied at present correspond well with the warm and humid climate periods in the adjacent area, indicating that the positive and negative evolution process of Hulun Buir Sandy Land is controlled by the regional climate evolution. The development time of the ancient soil in the sandy land corresponds to the high value of solar radiation, indicating that the change of the East Asian summer monsoon driven by solar radiation is the main factor for the climate reversal in Hulun Buir Sandy Land. In addition, the intensification of human activities in the past 2 000 years may have had a certain impact on the intensification of sandstorm activities.

Key words: Hulun Buir Sandy Land, holocene, climate change, aeolian sand-paleosol

CLC Number: