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Carbon chain length distribution in n-alkyl lipids: A process for evaluating source inputs to Lake Qinghai
Wang, Z (Wang, Zheng)[1]; Liu, WG (Liu, Weiguo)[1,2]
2012-09-30
发表期刊ORGANIC GEOCHEMISTRY
卷号50页码:36-43
文章类型期刊论文
摘要

Lake sediments generally contain a mixture of terrestrial and aquatic source inputs, and determining the major inputs is important for understanding geological records in paleoenvironment and paleoclimate research. In this study we describe the distribution of n-alkanes and n-fatty acids (FAs) in representative modern plants from around Lake Qinghai. We found a significant difference in the average length of n-FA carbon chains (ACL Fa(16-32)) in terrestrial (23.3) and aquatic plants (18.6). The results reveal that ACL Fa(16-32) may essentially serve as a proxy for evaluating the major source inputs to lake sediments. Assessment of surface sediments from the lake showed that the FAs originated from a mixture of inputs, with the aquatic source input predominant at most sites. Additionally, the delta D values of sediment mid-chain n-acids (C-22) showed a relationship with the ACL Fa(16-32) proxy: an increased Fa ACL corresponded to more negative hydrogen isotope ratio values. We suggest that different sources should be considered and ACL Fa(16-32) could be a potential calibration proxy before using delta D values to extract reliable isotopic information from lake water. More attention should be paid to source inputs and their relationship to other geochemical proxies in future studies of lake sediments.

DOI10.1016/j.orggeochem.2012.06.015
收录类别SCI ; EI
语种英语
引用统计
被引频次:20[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/361006/10117
专题加速器质谱中心
通讯作者Liu, WG (Liu, Weiguo)[1,2]
作者单位1.State Key Laboratory of Loess and Quaternary Geology, IEE, CAS, Xi’an 710075, China;
2.School of Human Settlement and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China
推荐引用方式
GB/T 7714
Wang, Z ,Liu, WG . Carbon chain length distribution in n-alkyl lipids: A process for evaluating source inputs to Lake Qinghai[J]. ORGANIC GEOCHEMISTRY,2012,50:36-43.
APA Wang, Z ,&Liu, WG .(2012).Carbon chain length distribution in n-alkyl lipids: A process for evaluating source inputs to Lake Qinghai.ORGANIC GEOCHEMISTRY,50,36-43.
MLA Wang, Z ,et al."Carbon chain length distribution in n-alkyl lipids: A process for evaluating source inputs to Lake Qinghai".ORGANIC GEOCHEMISTRY 50(2012):36-43.
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