干旱区生态环境知识资源中心(Arid): Aridity-controlled hydrogen isotope fractionation between soil n-alkanes and precipitation in China

Arid

DOI	10.1016/j.orggeochem.2019.04.009
	Aridity-controlled hydrogen isotope fractionation between soil n-alkanes and precipitation in China
	Li, Yangyang 1; Yang, Shiling 1,2,3; Luo, Pan 1,4; Xiong, Shangfa 1,3
通讯作者	Li, Yangyang
来源期刊	ORGANIC GEOCHEMISTRY
ISSN	0146-6380
EISSN	1873-5290
出版年	2019
卷号	133 页码:53-64
英文摘要	Leaf-wax n-alkane hydrogen isotope composition (delta D-alk) is widely applied as a proxy for paleohydroclimatic changes, but the factors controlling delta D-alk remain to be clarified. In this study, in order to determine the dominant controls, we measured delta D-alk in 54 surface soils along a southeast-northwest transect across a steep climatic gradient in China. delta D-alk is positively correlated with annual precipitation delta D (delta D-pann) and better correlated with growing season (April-October) precipitation delta D (delta D-pgs). However, the variability of delta D-pann (38 parts per thousand) and delta D-pgs (35 parts per thousand) does not explain all of the variance in delta D-alk (84 parts per thousand). The apparent fractionation of hydrogen isotopes between n-alkanes and precipitation (epsilon(alk/p)) is significantly correlated with variables related to aridity: relative humidity, rainfall amount, and aridity index (defined as the ratio of average precipitation to average potential evapotranspiration). This result demonstrates the important control of aridity on delta D-alk, which may result from the increasing soil evaporation and plant transpiration, as well as decreasing biosynthetic fractionation, in arid climates. We compiled published delta D-alk data from surface lake/soil sediments in China, and found that aridity effects are pronounced in regions with mean annual precipitation (MAP) < 800 mm. Therefore, we suggest that soil delta D-alk reflects precipitation delta D modified by aridity, with a greater degree of modification in arid environments (e.g., MAP < 800 mm). Future work to quantitatively determine the effects of aridity on delta D-alk is needed to improve the reliability of the application of delta D-alk in paleoenvironmental studies. (C) 2019 Elsevier Ltd. All rights reserved.
英文关键词	n-alkanes Hydrogen isotopes Apparent hydrogen isotopic fractionation
类型	Article
语种	英语
国家	Peoples R China ; Saudi Arabia
收录类别	SCI-E
WOS记录号	WOS:000469208100005
WOS关键词	DELTA-D VALUES ; POLYCYCLIC AROMATIC-HYDROCARBONS ; LEAF-WAX ; ORGANIC-MATTER ; ASIAN MONSOON ; D/H RATIOS ; ATMOSPHERIC AEROSOLS ; TERRESTRIAL PLANTS ; LIPID BIOSYNTHESIS ; AFRICAN HYDROLOGY
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
来源机构	中国科学院地质与地球物理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217826
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China; 2.CAS Ctr Excellence Life & Paleoenvironm, Beijing 100044, Peoples R China; 3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China; 4.Saudi Aramco, POB 9492, Dhahran 31311, Saudi Arabia
推荐引用方式 GB/T 7714	Li, Yangyang,Yang, Shiling,Luo, Pan,et al. Aridity-controlled hydrogen isotope fractionation between soil n-alkanes and precipitation in China[J]. 中国科学院地质与地球物理研究所,2019,133:53-64.
APA	Li, Yangyang,Yang, Shiling,Luo, Pan,&Xiong, Shangfa.(2019).Aridity-controlled hydrogen isotope fractionation between soil n-alkanes and precipitation in China.ORGANIC GEOCHEMISTRY,133,53-64.
MLA	Li, Yangyang,et al."Aridity-controlled hydrogen isotope fractionation between soil n-alkanes and precipitation in China".ORGANIC GEOCHEMISTRY 133(2019):53-64.