盐生荒漠土壤水稳定氢、氧同位素组成季节动态

周海; 郑新军; 唐立松; 李彦

doi:10.7522/j.issn.1000-694X.2013.00295

中国沙漠 >

2014 , Vol. 34 >Issue 1: 162 - 169

DOI: https://doi.org/10.7522/j.issn.1000-694X.2013.00295

生物与土壤

盐生荒漠土壤水稳定氢、氧同位素组成季节动态

周海 ,
郑新军 ,
唐立松 ,
李彦

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1. 中国科学院新疆生态与地理研究所荒漠与绿洲生态国家重点实验室/新疆阜康荒漠生态系统国家野外科学观测研究站, 新疆乌鲁木齐, 830011;
2. 中国科学院大学, 北京 100049

周海（1985- ），男，甘肃古浪人，硕士研究生，主要从事荒漠植物的水分响应与适应。Email：zhouhai1201@126.com

收稿日期: 2012-12-03

修回日期: 2013-01-25

网络出版日期: 2014-01-20

基金资助

国家自然科学基金项目（41171049）；国家国际科技合作项目（2011DFA31070）；中国科学院“西部之光”项目（XBBS201001）资助

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Analysis on Seasonal Dynamics of δ¹⁸O and δD in Soil Water at a Saline Desert Site in the Southeastern Junggar Basin

Zhou Hai ,
Zheng Xinjun ,
Tang Lisong ,
Li Yan

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1. State Key Laboratory of Desert and Oasis Ecology/Fukang Station of Desert Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2012-12-03

Revised date: 2013-01-25

Online published: 2014-01-20

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摘要

对准噶尔盆地东南缘降水和土壤水稳定氢、氧同位素组成（δ¹⁸O和δD）进行了测定，分析了降水中δ¹⁸O和δD值的季节变化规律，表层土壤水中δ¹⁸O和δD值对降水脉冲的动态响应以及不同深度土壤水中δ¹⁸O和δD值的变化特征。结果表明：该区域大气降水线为δD=7.691δ¹⁸O+4.606；降水与表层土壤水中δ¹⁸O和δD值表现出明显的季节变化特征；表层土壤水中δ¹⁸O和δD值、质量含水量对降水脉冲响应显著，且不同量级的降水导致不同程度的响应。利用LSD法对0~300 cm土层内土壤水中δ¹⁸O和δD值进行多重比较分析，可将土壤在垂直方向上分为3层，表层（0~50 cm）土壤水分活跃，稳定同位素值随深度的增加而迅速减小；中间层（50~180 cm）土壤水分相对活跃，既受到降水入渗和蒸发作用的影响，也有地下水的补给；深层（180~300 cm）水分来源稳定，土壤水中δ¹⁸O和δD值基本不变。

关键词： 准噶尔盆地; 土壤水分; 稳定氢、氧同位素; 降水脉冲

本文引用格式

周海 , 郑新军 , 唐立松 , 李彦 . 盐生荒漠土壤水稳定氢、氧同位素组成季节动态[J]. 中国沙漠, 2014 , 34(1) : 162 -169 . DOI: 10.7522/j.issn.1000-694X.2013.00295

Abstract

δ¹⁸O and δD in precipitation and soil water were measured at a saline desert site in the southeastern Junggar Basin, China, during the growing season in 2012. The seasonal dynamic of δ¹⁸O and δD in precipitation, topsoil water isotope response to pulse rainfall events and profile characteristic of soil water δ¹⁸O and δD were analyzed. The results showed that the equation off the local meteoric water line (LMWL) was δD=7.691 δ¹⁸O+4.606, the values of δ¹⁸O and δD in precipitation and topsoil water had obvious seasonal fluctuations. The surface soil water isotope and content responded significantly to pulse rainfall and different magnitudes of precipitation could trigger different degrees of response. Through LSD's multiple comparison, we distinguished three layers in soil profile of 0 300 cm. The upper layer (0-50 cm) had the most active soil moisture and the values of δ¹⁸O and δD reduced quickly with the depth. The middle layer (50-180 cm) had the relatively active soil moisture with stable isotope values which were influenced not only by precipitation infiltration and soil evaporation, but also by groundwater recharge. The lower layer (180-300 cm) had quasi-stable soil water content, the values of δ¹⁸O and δD were related to the stable shallow groundwater water.

Key words： Junggar Basin; soil water; δ¹⁸O and δD; pulse precipitation

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