基于光释光测年法的三江源地区高山草甸土形成年代与成因研究

先巴吉; 鄂崇毅; 孙满平; 张晶; 张帅旗; 谢丽倩

doi:10.13961/j.cnki.stbctb.2022.01.022

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基于光释光测年法的三江源地区高山草甸土形成年代与成因研究

试验研究

- 基于光释光测年法的三江源地区高山草甸土形成年代与成因研究
- Formation Age and Causes of Alpine Meadow Soil in Three River Headwater Region Based on Optically Stimulated Luminescence Dating
- 水土保持通报 2022年42卷第1期页码：158-165
- 作者机构：
  
  1. 青海师范大学青藏高原地表过程与生态保育教育部重点实验室,青海,西宁,810001
  2. 青海师范大学地理科学学院青海省自然地理与环境过程重点实验室,青海,西宁,810008
  3. 青海省人民政府-北京师范大学, 高原科学与可持续发展研究院,青海,西宁,810008
- 作者简介：
- 基金信息：
  
  国家自然科学基金项目“青海湖流域土壤年代学及其气候背景分析”(41761042);青海省科技厅自然科学基金“青海共和沙地末次盛冰期以来特征时段空间格局重建”(2021-ZJ-918)
- DOI：10.13961/j.cnki.stbctb.2022.01.022
  中图分类号： P95;S153.6
- 纸质出版：2022
- 稿件说明：
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先巴吉, 鄂崇毅, 孙满平, 等. 基于光释光测年法的三江源地区高山草甸土形成年代与成因研究[J]. 水土保持通报, 2022,42(1):158-165.

Xianbaji, E Chongyi, Sun Manping, et al. Formation Age and Causes of Alpine Meadow Soil in Three River Headwater Region Based on Optically Stimulated Luminescence Dating[J]. Bulletin of Soiland Water Conservation, 2022, 42(1): 158-165.
先巴吉, 鄂崇毅, 孙满平, 等. 基于光释光测年法的三江源地区高山草甸土形成年代与成因研究[J]. 水土保持通报, 2022,42(1):158-165. DOI： 10.13961/j.cnki.stbctb.2022.01.022.

Xianbaji, E Chongyi, Sun Manping, et al. Formation Age and Causes of Alpine Meadow Soil in Three River Headwater Region Based on Optically Stimulated Luminescence Dating[J]. Bulletin of Soiland Water Conservation, 2022, 42(1): 158-165. DOI： 10.13961/j.cnki.stbctb.2022.01.022.

摘要

[目的

]

分析三江源区高山草甸土壤的年代及发生发育过程，为维系该区土壤安全和生态安全提供指导。[方法

]

采用粗颗粒石英与钾长石光释光(OSL)测年法，对三江源区4个高山草甸土剖面夏琼(X

)、歇武(X

)、桐勒栋(T

)、斗地村(D

)土壤的形成发育时间进行研究，结合土壤粒度、元素地球化学特征分析该区土壤形成过程。[结果

]

三江源区高山草甸土在末次冰消期至早全新世(13—8 ka)和晚全新世(3—0 ka)均有发育；4个土壤剖面分别在坡积母质和风积母质上发育而成，但其不同土壤发生层的元素地球化学特征与该区典型风成黄土一致。[结论

]

高山草甸土的发育集中在全新世期间，土壤的母质以坡积物和风积物的混合母质为主，风尘输入对于三江源地区的土壤形成意义重大，也是该区坡积物的原始物源，全新世气候相对干旱期的风尘释放对草甸土的形成意义重大。

Abstract

[Objective] The age

occurrence

and development of alpine meadow soil in the Three River headwater region were analyzed to provide guidance for maintaining soil and ecological security in the region. [Methods] The formation and development time of the soil profiles from Xiaqiong

Xiewu

Tongledong

and Doudicun in the Three River headwater region were determined using the optically stimulated luminescence (OSL) dating method of coarse-grained quartz and potassium feldspar (K-feldspar). [Results] The development time of alpine meadow soil in this area was Early Holocene (13—8 ka) and Late Holocene (3—0 ka). The four soil profiles were developed on slope and eolian parent material

respectively. The elemental geochemical characteristics of different soil layers were consistent with the typical aeolian loess in this area. [Conclusion] The development of alpine meadow soil was concentrated in the Holocene period. The parent material of soil was mainly the mixed parent material of slope deposits and aeolian deposits. The input of aeolian dust is of great significance to soil formation in the Three River headwater region

and is also the original material source of slope deposits in this area. The release of aeolian dust during the relatively arid period of Holocene is of great significance to the formation of meadow soil.

关键词

Keywords

references

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