Comparison of n-alkane concentrations and delta D values between leaves and roots in modern plants on the Chinese Loess Plateau

doi:10.1016/j.orggeochem.2019.103913

	Comparison of n-alkane concentrations and delta D values between leaves and roots in modern plants on the Chinese Loess Plateau
	Liu, Jinzhao 1,3; An, Zhisheng 3; Wu, Huawu 2; Yu, Yunlong 3
刊名	ORGANIC GEOCHEMISTRY
	2019-12-01
卷号	138 页码:10
关键词	n-Alkane Leaf-derived Root-derived Concentration delta D Chinese Loess
ISSN号	0146-6380
DOI	10.1016/j.orggeochem.2019.103913
通讯作者	Liu, Jinzhao(liujinzhao@ieecas.cn)
英文摘要	Sedimentary delta Dn-alkane values have been widely used as a valuable proxy for paleoenvironmental reconstruction. A number of studies have focused on delta D(n-alkne )values that derived exclusively from leaves, while less attention has been paid to the root-derived n-alkanes and their impact on sedimentary delta Dn-alkane values. In this study, we sampled modern plant leaf and root materials from different growth contexts (slopes and seasons) on the Chinese Loess Plateau to compare leaf-derived n-alkanes with root-derived n-alkanes. Our results demonstrated that total n-alkane (C-27-C-33) concentrations varied substantially between leaf and root materials, with average values of 209 and 29.5 mu g/g observed in leaves and roots respectively. The results suggest that ca. 12% of the n-alkane concentrations in sediments may be derived from plant roots. Furthermore, leaf-derived delta Dn-alkane values for Stipa bungeana (grass), Artemisisa vestita (shrub) and Bothriochloa ischaemum (grass) averaged -184 parts per thousand, -152 parts per thousand, and -198 parts per thousand, compared with their root-derived delta Dn-alkane values of -19 parts per thousand, -179 parts per thousand, and -163 parts per thousand, respectively. These statistically significant differences in concentrations and delta D values between leaf-derived and root-derived n-alkanes suggest that the contribution of n-alkanes derived from plant roots is important for evaluating the resultant n-alkane compositions of sediments for paleoenvironmental reconstruction. Our findings indicates that the effects of root-derived n-alkanes on total sedimentary delta Dn-alkane values should be considered carefully in future paleoenvironmental reconstruction efforts. (C) 2019 Elsevier Ltd. All rights reserved.
资助项目	Chinese Academy of Sciences[QYZDY-SSW-DQC001] ; Chinese Academy of Sciences[132B61KYSB20170005] ; National Natural Science Foundation of China[41420104008]
WOS关键词	HYDROGEN ISOTOPE RATIOS ; SOIL ORGANIC-MATTER ; LEAF-WAXES ; D/H RATIOS ; DISTRIBUTIONS ; FRACTIONATION ; PRECIPITATION ; TERRESTRIAL ; VARIABILITY ; ENRICHMENT
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000500549500005
资助机构	Chinese Academy of Sciences ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/13039]
专题	地球环境研究所_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, Jinzhao
作者单位	1.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Shaanxi, Peoples R China 2.Chinese Acad Sci, Nanjing Inst Geog & Limnol, Key Lab Watershed Geog Sci, Nanjing 210008, Jiangsu, Peoples R China 3.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Liu, Jinzhao,An, Zhisheng,Wu, Huawu,et al. Comparison of n-alkane concentrations and delta D values between leaves and roots in modern plants on the Chinese Loess Plateau[J]. ORGANIC GEOCHEMISTRY,2019,138:10.
APA	Liu, Jinzhao,An, Zhisheng,Wu, Huawu,&Yu, Yunlong.(2019).Comparison of n-alkane concentrations and delta D values between leaves and roots in modern plants on the Chinese Loess Plateau.ORGANIC GEOCHEMISTRY,138,10.
MLA	Liu, Jinzhao,et al."Comparison of n-alkane concentrations and delta D values between leaves and roots in modern plants on the Chinese Loess Plateau".ORGANIC GEOCHEMISTRY 138(2019):10.