Hydrogen isotope fractionation variations of n-alkanes and fatty acids in algae and submerged plants from Tibetan Plateau lakes: Implications for palaeoclimatic reconstruction

doi:10.1016/j.scitotenv.2019.133925

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	Hydrogen isotope fractionation variations of n-alkanes and fatty acids in algae and submerged plants from Tibetan Plateau lakes: Implications for palaeoclimatic reconstruction
	Liu, Hu 1,2; Liu, Weiguo 1,2,3
通讯作者	Liu, Weiguo(liuwg@loess.llqg.ac.cn)
	2019-12-10
发表期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
卷号	695 页码:12
摘要	The hydrogen isotope compositions (6D) of n-alkanes and fatty acids (FAs) are widely applied in palaeoclimatic reconstructions, and the determinations of their hydrogen isotope fractionation factor values (epsilon) are vital for quantitatively reconstructing past precipitation variations. Currently, studies on n-alkane and FA epsilon values focus on terrestrial plants, which, however, show large uncertainties because of the influence of evapotranspiration. Therefore, in this study, we analysed the c values of algae and submerged plants immersed in lakes, which are not affected by evapotranspiration, to understand the hydrogen isotope fractionation of plant lipid synthesis. By investigating the delta D values of lipids (n-alkanes and Elks) in algae and submerged plants and the delta D values of co-existing water (including lake bottom water, surface sediment water, and leaf water of algae and submerged plants) from five Tibetan Plateau lakes, we find that the n-alkane c values of algae and submerged plants show narrow changes, ranging from 176 to 159%. and 167 to 142%, respectively. The FA c values of algae and submerged plants also show small variations, ranging from -160 to -121 parts per thousand. (except Chara) and -161 to -138 parts per thousand., respectively. Therefore, the average biosynthetic hydrogen isotope fractionation of these plants is -162 parts per thousand. for n-alkanes and -145 parts per thousand. for FAs, and the small epsilon differences between FAs and n-alkanes can be related to the different magnitudes of FA utilization in n-alkane synthesis. Finally, we find that the biosynthetic hydrogen isotope fractionation factors of aquatic plants are close to those of terrestrial grasses but slightly more negative than those of terrestrial woody plants. Thus, our results are helpful for understanding the hydrogen isotope fractionation variations in terrestrial plant lipids, which is beneficial for palaeohydrological reconstructions. (C) 2019 Elsevier B.V. All rights reserved.
关键词	Hydrogen isotope fractionations n-alkanes Fatty acids Algae Submerged plants
DOI	10.1016/j.scitotenv.2019.133925
关键词[WOS]	DELTA-D VALUES ; LEAF WAXES ; TERRESTRIAL PLANTS ; LACUSTRINE SEDIMENTS ; AQUATIC PLANTS ; ENVIRONMENTAL-CHANGE ; QINGHAI SEDIMENTS ; LIPID BIOMARKERS ; LATE PLEISTOCENE ; WATER TRANSPORT
收录类别	SCI ; SCI
语种	英语
资助项目	National Natural Science Foundation of China[41573005] ; National Basic Research Program of China[2013CB955901] ; Key Programme of the Chinese Academy of Sciences[QYZDY-SSW-DQC001] ; State Key Laboratory of Loess and Quaternary Geology[SKLLQG1632]
WOS研究方向	Environmental Sciences & Ecology
项目资助者	National Natural Science Foundation of China ; National Basic Research Program of China ; Key Programme of the Chinese Academy of Sciences ; State Key Laboratory of Loess and Quaternary Geology
WOS类目	Environmental Sciences
WOS记录号	WOS:000496802200107
出版者	ELSEVIER
引用统计	被引频次：15[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/361006/12985
专题	加速器质谱中心第四纪科学与全球变化卓越创新中心
通讯作者	Liu, Weiguo
作者单位	1.Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Inst Earth Environm, Xian 710061, Shaanxi, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Liu, Hu,Liu, Weiguo. Hydrogen isotope fractionation variations of n-alkanes and fatty acids in algae and submerged plants from Tibetan Plateau lakes: Implications for palaeoclimatic reconstruction[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019,695:12.
APA	Liu, Hu,&Liu, Weiguo.(2019).Hydrogen isotope fractionation variations of n-alkanes and fatty acids in algae and submerged plants from Tibetan Plateau lakes: Implications for palaeoclimatic reconstruction.SCIENCE OF THE TOTAL ENVIRONMENT,695,12.
MLA	Liu, Hu,et al."Hydrogen isotope fractionation variations of n-alkanes and fatty acids in algae and submerged plants from Tibetan Plateau lakes: Implications for palaeoclimatic reconstruction".SCIENCE OF THE TOTAL ENVIRONMENT 695(2019):12.