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中国沙漠 ›› 2024, Vol. 44 ›› Issue (4): 223-235.DOI: 10.7522/j.issn.1000-694X.2024.00043

• • 上一篇    下一篇

科尔沁沙地地表沉积物特征及其气候意义

张悦仪1(), 迟云平1,2(), 谢远云1,2, 康春国3, 刘若男1, 孙磊1, 吴鹏1, 魏振宇1   

  1. 1.哈尔滨师范大学,地理科学学院,黑龙江 哈尔滨 150025
    2.哈尔滨师范大学,寒区地理环境监测与空间信息服务黑龙江省重点实验室,黑龙江 哈尔滨 150025
    3.哈尔滨学院 地理与旅游学院,黑龙江 哈尔滨 150086
  • 收稿日期:2024-02-07 修回日期:2024-04-15 出版日期:2024-07-20 发布日期:2024-08-29
  • 通讯作者: 迟云平
  • 作者简介:迟云平(E-mail: 1982cyp@163.com
    张悦仪(2000—),女,黑龙江哈尔滨人,硕士研究生,主要研究方向为第四纪地质与古环境变化。E-mail: zyynicl@163.com
  • 基金资助:
    国家自然科学基金项目(42171006);哈尔滨师范大学博士启动基金项目(XKB201418);哈尔滨师范大学学术创新项目(HSDSSCX2023-51)

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

摘要:

沙漠作为干旱气候的产物,记录着气候与环境变迁的丰富信息,在不同区域条件下沙漠风成沉积物特征指示的气候环境存在差异。本研究在科尔沁沙地自东向西共选取25个样点,进行色度、漫反射光谱和磁化率分析,探讨沙地地表风成沉积物的空间变化特征,并结合区域的现代气候因子探讨各代用指标的气候意义。结果表明:科尔沁沙地地表风成沉积物的色度特征与区域降水关系密切,亮度(L*)、红度(a*)与黄度红度比(b*/a*)能够作为指示区域气候的代用指标;地表沉积物中针铁矿(Gt)和赤铁矿(Hm)的相对含量均处于较低水平,Gt/Hm的变化能够指示气候干湿条件的总体趋向;地表风成沉积物的χfd%值能够作为区域降水情况的代用指标,沉积物的磁性增强主要源于降水强度增加导致的风化成壤作用加强,进而产生大量细颗粒亚铁磁性矿物。总体而言,科尔沁沙地地表风成沉积物色度、磁化率和Gt/Hm能够有效指示区域气候环境。

关键词: 地表沉积物, 色度, 针铁矿赤铁矿比值(Gt/Hm), 磁化率, 气候意义

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

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