干旱区研究

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2018 , Vol. 35 >Issue 2: 471 - 476

DOI: https://doi.org/10.13866/j.azr.2018.02.27

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中国主要沙漠(沙地)的氧同位素含量特征

  • 霍俊澎 ,
  • 郭浩 ,
  • 郭翠萍 ,
  • 辛智鸣
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  • 1.中国林业科学研究院荒漠化研究所,北京 100091;
    2.北票市台吉林果服务站,辽宁 北票 122122;
    3.中国林业科学研究院沙漠林业实验中心,内蒙古 巴彦淖尔 015200
霍俊澎(1993-),男,硕士研究生,主要从事荒漠化防治研究.E-mail: huojunpengmail@163.com
郭浩. E-mail:guohaomail@163.com

收稿日期: 2017-05-24

  修回日期: 2017-09-27

  网络出版日期: 2025-11-17

基金资助

国家自然科学基金项目(41371500)和国家重点研发计划(2016YFC0501004)资助

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Oxygen Isotopic Content in the Main Deserts (Sandy Lands) in China

  • HUO Jun-peng ,
  • GUO Hao ,
  • GUO Cui-ping ,
  • XIN Zhi-ming
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  • 1. Institute of Desertification Studies,Chinese Academy of Forestry,Beijing 100091,China;
    2. Beipiao Taiji Forestry & Fruit Service Center,Beipiao 122122,Liaoning,China;
    3. Experimental Center of Desert Forestry,Chinese Academy of Forestry,Bayannur 015200,Inner Mongolia,China

Received date: 2017-05-24

  Revised date: 2017-09-27

  Online published: 2025-11-17

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摘要

为了解中国主要沙漠(沙地)的石英氧同位素分布特征,分别在各个沙漠(沙地)进行采样,采用同位素质谱技术分析样品的石英氧同位素组成。结果表明:中国主要沙漠(沙地)的石英δ18O变化范围为7.8‰~14.9‰;各个沙漠(沙地)内部物质均质化程度差异较大,其中塔克拉玛干沙漠均质化程度最低,巴丹吉林沙漠均质化程度最高;中国主要沙漠(沙地)石英氧同位素空间变化特征明显,从中国北方沙漠(鄂尔多斯高原和阿拉善高原)至准噶尔盆地,到塔克拉玛干沙漠,再到柴达木沙漠,最后到乌兰布和沙漠呈现出依次增高趋势。

关键词： 石英氧同位素; 沙漠; 沙地; 地表沉积物; 空间分布; 中国

本文引用格式

霍俊澎 , 郭浩 , 郭翠萍 , 辛智鸣 . 中国主要沙漠(沙地)的氧同位素含量特征[J]. 干旱区研究, 2018 , 35(2) : 471 -476 . DOI: 10.13866/j.azr.2018.02.27

Abstract

The widely distributed arid land in northwest China provides abundant dust for sandstorm occurrence,which causes the serious economic and social problems.It is important to monitor the change of environmental and meteorological factors and to study the desert ecosystem and desertification control.In recent years,some researchers found that dust play a positive effect on increasing the nutrient content of river and enriching the nutrient content of topsoil.So the study on provenances of aeolian sand is of not only the great theoretical and practical significance in aeolian geomorphology,but is also essential for understanding the complex linkages among dust emission,loess accumulation,climate system,and ocean biogeochemistry cycle.It is generally known that the dust sources in China are mainly the vast deserts and sandy lands in northwest China,but the specific distribution and contribution rate are unclear.Previous researchers found that the isotopic exchange of sand-sized quartz was minor under sedimentary conditions.In other words,the isotopic features of quartz will not be changed even after a number of sedimentary cycles.So this paper studied the oxygen isotopic distribution of quartz to establish a foundation for dust tracing.In order to understand the oxygen isotopic distribution of quartz in the main deserts (sandy lands) in China,seventy-five sediment samples were collected from eight deserts and four sandy lands in China,including the Taklimakan Desert,Gurbantunggut Desert,Kumtag Desert,Qaidam Desert,Tengger Desert,Ulan Buh Desert,Mu Us Sandy Land,Hobq Desert,Badain Juran Desert,Hulunbuir Sandy Land,Otindag Sandy Land,and Horqin Sandy Land during the period from 2014 to 2016.Samples were taken from 10 cm thick topsoil far away from human habitation.The samples were crushed to pass through a 200 mesh.Oxygen isotopic compositions of quartz were measured by means of isotope ratio mass spectrometry.The result showed that the quartz δ18O values varied between 7.8‰ and 14.9‰.There was a big difference in homogenization degree of internal surface sediment among different deserts (sandy lands),in which the homogenization degree in the Taklimagan Desert was the lowest,and that in the Badain Juran Desert was the highest;the spatial variation of oxygen isotopic compositions of quartz in the main deserts (sandy lands) in China was obvious.

Key words： quartz oxygen isotope; desert; sandy land; surface sediment; spatial distribution; China

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