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Distributions and hydrogen isotopic compositionsof plant leaf wax from Orinus kokonorica along ageneral aridity gradient around Lake Qinghai,China
Yao,Y(Yao,Yuan)[1,2]; Liu,WG(Liu,Weiguo)[1,2]
2014
发表期刊Chin.J.Geochem.
卷号33页码:236-243
文章类型期刊论文
摘要

To quantitatively analyze the response of distributions and hydrogen isotopic compositions (δD) of plant leaf wax to moisture, and to better understand their implications for paleoclimatic reconstruction, we measured average chain length (ACL) and δD values of n-alkanes and n-fatty acids (n-FAs) from Orinus kokonorica, a typical and representative plant in Lake Qinghai area, along a distance transect extending from lakeshore to wetland to dryland in the arid ecosystem. The results showed that the ACL values of n-alkanes and n-FAs were negatively correlated with soil water content (SWC) with R2=0.593 and R2=0.924, respectively. This is as a result of plant’s response to water loss with more abundance in long-chain n-alkyl lipids under increasing aridity by analyzing relationships between the molecular ratios of long-chain n-alkyl lipids (n-alkanes and n-FAs) from O. kokonorica and SWC. The δD values of C29 n-alkane and C28 n-FA were also negatively correlated with SWC with R2=0.778 and R2=0.760, respectively, which may due to enhanced D-enrichment in leaf water by evapotranspiration (soil water evaporation and leaf water transpiration) with increasing aridity. Our results demonstrated that moisture exerts a significant control on the ACL and δD values from O. kokonorica in an arid ecosystem. This preliminary study on a modern single plant (O. kokonorica) sets a foundation for comprehending these values as quantitative proxies for paleo-humidity reconstruction.

关键词Average Chain Length Hydrogen Isotope Moisture Orinus Kokonorica Lake Qinghai
DOI10.1007/s11631-014-0682-2
收录类别SCI
语种英语
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/9861
专题加速器质谱中心
通讯作者Liu,WG(Liu,Weiguo)[1,2]
作者单位1.School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China;
2.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China
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Yao,Y,Liu,WG. Distributions and hydrogen isotopic compositionsof plant leaf wax from Orinus kokonorica along ageneral aridity gradient around Lake Qinghai,China[J]. Chin.J.Geochem.,2014,33:236-243.
APA Yao,Y,&Liu,WG.(2014).Distributions and hydrogen isotopic compositionsof plant leaf wax from Orinus kokonorica along ageneral aridity gradient around Lake Qinghai,China.Chin.J.Geochem.,33,236-243.
MLA Yao,Y,et al."Distributions and hydrogen isotopic compositionsof plant leaf wax from Orinus kokonorica along ageneral aridity gradient around Lake Qinghai,China".Chin.J.Geochem. 33(2014):236-243.
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