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冰川冻土 ›› 2021, Vol. 43 ›› Issue (3): 818-826.doi: 10.7522/j.issn.1000-0240.2021.0023

• • 上一篇    下一篇

黄土记录的中亚干旱区东部全新世气候与环境演化

范义姣1(),马箫忆1,刘慧1,王树源1,杨军怀1,陈梓炫1,高福元2,贾佳3,夏敦胜1()   

  1. 1.兰州大学 资源环境学院 西部环境教育部重点实验室,甘肃 兰州 730000
    2.兰州城市学院 地理与环境工程学院,甘肃 兰州 730070
    3.浙江师范大学 地理与环境科学学院,浙江 金华 321004
  • 收稿日期:2021-04-21 修回日期:2021-06-10 出版日期:2021-06-30 发布日期:2021-05-18
  • 通讯作者: 夏敦胜 E-mail:fanyj18@lzu.edu.cn;dsxia@lzu.edu.cn
  • 作者简介:王修喜,副教授,主要从事构造地貌演化与低温热年代学研究. E-mail:wangxiuxi@lzu.edu.cn|范义姣,博士研究生,主要从事第四纪黄土与气候变化研究. E-mail: fanyj18@lzu.edu.cn
  • 基金资助:
    国家自然科学基金项目(41671001);科技部高端外国专家引进计划项目(G20200028014);国家自然科学基金项目(41877444)

Climatic and environmental evolution during the Holocene in the eastern Arid Central Asia recorded by loess-paleosol sequences

Yijiao FAN1(),Xiaoyi MA1,Hui LIU1,Shuyuan WANG1,Junhuai YANG1,Zixuan CHEN1,Fuyuan GAO2,Jia JIA3,Dunsheng XIA1()   

  1. 1.Key Laboratory of Western China’s Environmental Systems,Ministry of Education,College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China
    2.College of Geography and Environmental Engineering,Lanzhou City University,Lanzhou 730070,China
    3.College of Geography and Environmental Sciences,Zhejiang Normal University,Jinhua 321004,Zhejiang,China
  • Received:2021-04-21 Revised:2021-06-10 Online:2021-06-30 Published:2021-05-18
  • Contact: Dunsheng XIA E-mail:fanyj18@lzu.edu.cn;dsxia@lzu.edu.cn

摘要:

选取位于中亚干旱区东部新疆天山地区的两个典型黄土沉积剖面,通过磁学参数(χARM/SIRM)、亮度(L*)、有机碳/氮同位素(δ13Corgδ15N)等记录,对研究区内全新世以来的气候环境进行重建。结果表明:早全新世,χARM/SIRM、L*指示黄土成壤较弱、有机质含量低,δ13Corg记录表明区域降水较少,共同反映该时期地表植被覆盖低、相对干旱的气候环境;中晚全新世,χARM/SIRM、L*δ13Corg记录的湿度逐渐增加,黄土δ15N偏正变化,指示地表生态系统生产力增强、植被覆盖增加,表明该区域气候适宜期发生在中晚全新世。中亚干旱区东部全新世以来的气候环境特征,与北半球高纬度冰盖、太阳辐射强度的变化密切相关。

关键词: 夷平面, 年代学, 地貌因子, 青藏高原, 西秦岭, 新生代, 黄土, δ13Corg, δ15N, 全新世, 新疆天山地区, 中亚干旱区东部

Abstract:

Two typical loess-paleosol sequences (KS16 and LJW10), located in the Tianshan region of Xinjiang in the eastern Arid Central Asia (ACA), were selected to reconstruct the climatic and environmental evolution during the Holocene. The susceptibility parameters (χARM/SIRM), lightness (L*), organic carbon/nitrogen isotope (δ13Corg and δ15N) of the KS16 section (43°25′56″ N, 83°56′35″ E, 1 314 m a.s.l.) in the Ili Basin were analyzed comprehensively. In addition, we combined the δ15N of LJW10 section (43°58′29″ N, 85°20′10″ E, 1 462 m a.s.l.), located in the northern Tianshan Mountains, and the proxies (χARM/SIRM, L*δ13Corgδ15N,) of KS16 section to reconstruct regional climatic and environmental evolution during the Holocene, which is helpful to understanding the synergistic effects of climate change and ecological environment in the eastern Arid Central Asia. The results show that: During the early Holocene, the χARM/SIRM and L* both indicated the pedogenesis was relatively weak and the organic matter content was low in the loess, with positive δ13Corg showed regional precipitation was limited, which reflected the low vegetation coverage and relatively arid climate environment during this period. During the middle and late Holocene, the variations of χARM/SIRM, L* and δ13Corg showed the moisture gradually increased, and the δ15N record presented more positive, which all indicated that the climatic optimum occurred at this period. The climatic and environmental characteristics of the eastern Arid Central Asia during the Holocene are closely related to the variations of the high latitude ice sheet and the intensity of insolation in northern hemisphere.

Key words: planation surfaces, chronology, geomorphologic factor, Tibetan Plateau, West Qinling, Cenozoic, loess, δ13Corg, δ15N, Holocene, Tianshan region of Xinjiang, eastern Arid Central Asia

中图分类号: 

  • P531