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干旱区地理 ›› 2025, Vol. 48 ›› Issue (11): 1913-1925.doi: 10.12118/j.issn.1000-6060.2024.721 cstr: 32274.14.ALG2024721

• 气候变化 • 上一篇    下一篇

河套盆地~68.6—46.4 ka BP古植被演替及最暖月气温变化特征

马紫轩1(), 李新玲1,2(), 蔡茂堂3, 李志洲1, 朱海宇1, 刘思维1   

  1. 1.河北师范大学地理科学学院,河北 石家庄 050024
    2.河北省环境演变与生态建设重点实验室,河北 石家庄 050024
    3.中国地质科学院地质力学研究所,北京 100081
  • 收稿日期:2024-11-28 修回日期:2025-02-08 出版日期:2025-11-25 发布日期:2025-11-26
  • 通讯作者: 李新玲(1985-),女,博士,副教授,主要从事环境演变与全球变化研究. E-mail: lixinling@hebtu.edu.cn
  • 作者简介:马紫轩(1992-),女,硕士研究生,主要从事环境演变与全球变化研究. E-mail: mazixuan@163.com
  • 基金资助:
    国家自然科学基金青年项目(42002197)

Characteristics of paleovegetation succession and temperature variation in the warmest month at ~68.6—46.4 ka BP in the Hetao Basin

MA Zixuan1(), LI Xinling1,2(), CAI Maotang3, LI Zhizhou1, ZHU Haiyu1, LIU Siwei1   

  1. 1. College of Geographic Sciences, Hebei Normal University, Shijiazhuang 050024, Hebei, China
    2. Hebei Key Laboratory of Environmental Evolution and Ecological Construction, Shijiazhuang 050024, Hebei, China
    3. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
  • Received:2024-11-28 Revised:2025-02-08 Published:2025-11-25 Online:2025-11-26

摘要: 基于河套盆地HJ01钻孔已有年代框架,对湖相沉积物中207个样品进行了孢粉分析,并利用加权平均偏最小二乘回归(WAPLS)方法定量重建了河套盆地~68.6—46.4 ka BP的最暖月气温变化过程。结果表明:(1)河套盆地内植被类型以荒漠草原为主,主要科属含量在不同阶段存在差异;周围山地发育以云杉为主的针叶林,经历了2期扩张和1期退缩。(2)~68.6—57.0 ka BP最暖月气温为14.2 ℃,在10.1~16.9 ℃之间波动,表明气候整体寒冷;~57.0—52.2 ka BP最暖月气温平均升高1.5 ℃,最高时可达15.7 ℃,并在10.5~21.6 ℃之间波动,表明气候转暖;~52.2—46.4 ka BP最暖月气温为15.8 ℃,在13.2~17.8 ℃之间波动,表明气候相对温暖。(3)重建最暖月气温与全球典型古气候记录对比显示,北半球夏季太阳辐射及欧亚冰量的变化可能是影响河套盆地~68.6—46.4 ka BP最暖月气温变化的重要驱动因素。研究结果可为预测未来冰期气候变化提供科学参考。

关键词: MIS4, 河套盆地, 孢粉组合, 古气候定量重建, 古植被演替

Abstract:

Utilizing the established age framework of the HJ01 borehole in the Hetao Basin, Inner Monglia, China, we conducted pollen analysis on 207 samples from lacustrine sediments. We employed the weighted average partial least squares regression method to quantitatively reconstruct the temperature changes during the warmest month in the Hetao Basin from approximately 68.6 ka BP to 46.4 ka BP. The results indicate the following. (1) The primary vegetation types in the Hetao Basin are desert grasslands, with variations in the content of major families and genera at different stages; the surrounding mountainous areas have developed coniferous forests, predominantly of spruce, which have experienced two phases of expansion and one phase of retreat. (2) From approximately 68.6 ka BP to 57.0 ka BP, the warmest month temperature averaged 14.2 ℃, fluctuating between 10.1 ℃ and 16.9 ℃, suggesting an overall cold climate. The average temperature increase during the warmest month from approximately 57.0 ka BP to 52.2 ka BP was 1.5 ℃. The highest temperature recorded was 15.7 ℃, with fluctuations between 10.5 ℃ and 21.6 ℃, indicating a warming climate. From approximately 52.2 ka BP to 46.4 ka BP, the warmest month temperature averaged 15.8 ℃, with fluctuations between 13.2 ℃ and 17.8 ℃, reflecting a relatively warm climate. (3) By comparing the reconstructed temperatures of the warmest month with typical global paleoclimate records, we find that changes in summer solar radiation and Eurasian ice cover in the Northern Hemisphere may significantly influence temperature variations during the warmest month in the Hetao Basin from approximately 68.6 ka BP to 46.4 ka BP. These findings provide a scientific basis for predicting future glacial climate changes.

Key words: MIS4, Hetao Basin, pollen assemblage, quantitative reconstruction of paleoclimate, paleovegetation succession