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Journal of Desert Research ›› 2024, Vol. 44 ›› Issue (4): 223-235.DOI: 10.7522/j.issn.1000-694X.2024.00043

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Characteristics and climate significance of surface sediments in the Horqin Sandy Land

Yueyi Zhang1(), Yunping Chi1,2(), Yuanyun Xie1,2, Chunguo Kang3, Ruonan Liu1, 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.School of Geography and Tourism,Harbin University,Harbin 150086,China
  • Received:2024-02-07 Revised:2024-04-15 Online:2024-07-20 Published:2024-08-29
  • Contact: Yunping Chi

Abstract:

As a product of arid climate, deserts record rich information about climate and environmental changes. The climate environment indicated by the characteristics of desert aeolian sediments varies under different regional conditions. In this study, we selected a total of 25 sample points from east to west in the Horqin Sandy Land, and the chromaticity index, DRS and magnetic susceptibility were analyzed to explore the spatial variation characteristics of aeolian sediments on the sandy surface. At the same time, the climate significance of various proxy indicators in the context of regional modern climate factors is discussed. The results show that the chromaticity characteristics of surface wind-sand sediments in Horqin Sandy Land are closely related to regional precipitation. L*, a* and b*/a* can be used as proxy indicators to indicate regional climate. The goethite and hematite in surface sediments are at low levels, and changes in Gt/Hm can indicate the overall trend of dry and wet climate conditions. The χfd% value of surface wind-sand sediments can be used as a proxy indicator of regional precipitation. The magnetic enhancement of sediments is mainly due to the strengthening of weathering and pedogenesis caused by the increase of precipitation intensity, which leads to the production of a large number of fine-grained ferromagnetic minerals. Generally speaking, the chromaticity, magnetic susceptibility and goethite to hematite ratio of surface aeolian sediments in Horqin sandy land can effectively indicate the regional climate and environment. This study deepens the relationship between surface sedimentation and climatic parameters in Northeast China from the perspective of modern process, and provides an important reference for the reconstruction of paleoclimate change history in Northeast China.

Key words: surface sediment, chromaticity, goethite to hematite ratio, magnetic susceptibility, climate significance

CLC Number: