IEECAS OpenIR
Hydrogen isotopic compositions along a precipitation gradient of Chinese Loess Plateau: Critical roles of precipitation/evaporation and vegetation change as controls for leaf wax delta D
Liu, Weiguo1,2,3; Wang, Huanye1,3; Leng, Qin4; Liu, Hu1,2; Zhang, Huan1,3; Xing, Meng1,3; Cao, Yunning1,3; Yang, Hong4
通讯作者Liu, Weiguo(liuwg@loess.llqg.ac.cn) ; Yang, Hong(hyang@bryant.edu)
2019-12-05
发表期刊CHEMICAL GEOLOGY
ISSN0009-2541
卷号528页码:10
摘要The hydrogen isotopic compositions (delta D) of long-chain plant leaf waxes can reflect changes of continental hydrology and thus have been increasingly utilized for paleoclimate reconstruction. One of the unresolved major issues is whether variations of leaf wax delta D (delta D-wax) signals along a precipitation gradient reflect changes of precipitation delta D, precipitation amount, and/or evapo-transpiration. This ambiguity limits our interpretation of delta D wax in geological records as well as the quantitative reconstruction of paleohydrological variability. Here we systematically investigated delta D of soil water and waxes extracted from soil and plant leaves in the Chinese Loess Plateau (CLP) and its surrounding areas along a precipitation gradient with mean annual precipitation (MAP) varying from 140 mm to 676 mm. The results showed that while the variation of modeled precipitation delta D has no significant correlation with MAP, soil water delta D, soil delta D-wax, and individual plant delta D-wax exhibit negative correlations with MAP. In relatively arid areas, the delta D values of soil water and plant leaf waxes are significantly more positive due to much lower precipitation relative to evapo-transpiration, suggesting that effective precipitation (P:E ratio) has played a crucial role in the D-enrichment of soil and plant leaf waxes in this region. While parallel decreasing trends in delta D wax are found along the increase of precipitation gradient among dominant plants (including Artemisia spp., Aster hispidus, Stipa bungeana, and Cleistogenes squarrosa) in the region with similar slopes, the large delta D offsets between plant groups suggest that plant type is an important factor in controlling plant hydrogen isotope fractionations. Our results indicate that delta D wax preserved in paleosols can be used to infer past conditions of water availability in arid and semi-arid inland regions, but with a mechanism that is different from the influence of "amount effect" in humid areas. Moreover, vegetation changes should be constrained by independent paleobotanical data before monsoon related paleohydrology in the CLP and its surrounding areas can be quantitatively reconstructed using the plant wax delta D proxy.
关键词Hydrogen isotope Leaf wax Precipitation amount Chinese Loess Plateau
DOI10.1016/j.chemgeo.2019.119278
关键词[WOS]GENERAL-CIRCULATION MODEL ; SEDIMENTARY N-ALKANES ; ASIAN MONSOON REGION ; D VALUES ; TIBETAN PLATEAU ; STABLE-ISOTOPES ; D/H RATIOS ; PALEOSOL SEQUENCE ; WATER ISOTOPES ; SOIL-MOISTURE
收录类别SCI ; SCI
语种英语
资助项目National Natural Science Foundation of China[41873008] ; Chinese Academy of Sciences[QYZDY-SSW-DQC001] ; Chinese Academy of Sciences[XDA20070202] ; Bryant University
WOS研究方向Geochemistry & Geophysics
项目资助者National Natural Science Foundation of China ; Chinese Academy of Sciences ; Bryant University
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000505975900009
出版者ELSEVIER
引用统计
被引频次:14[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/361006/13086
专题中国科学院地球环境研究所
通讯作者Liu, Weiguo; Yang, Hong
作者单位1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China
4.Bryant Univ, Coll Arts & Sci, Dept Sci & Technol, Lab Terr Environm, Smithfield, RI 02917 USA
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GB/T 7714
Liu, Weiguo,Wang, Huanye,Leng, Qin,et al. Hydrogen isotopic compositions along a precipitation gradient of Chinese Loess Plateau: Critical roles of precipitation/evaporation and vegetation change as controls for leaf wax delta D[J]. CHEMICAL GEOLOGY,2019,528:10.
APA Liu, Weiguo.,Wang, Huanye.,Leng, Qin.,Liu, Hu.,Zhang, Huan.,...&Yang, Hong.(2019).Hydrogen isotopic compositions along a precipitation gradient of Chinese Loess Plateau: Critical roles of precipitation/evaporation and vegetation change as controls for leaf wax delta D.CHEMICAL GEOLOGY,528,10.
MLA Liu, Weiguo,et al."Hydrogen isotopic compositions along a precipitation gradient of Chinese Loess Plateau: Critical roles of precipitation/evaporation and vegetation change as controls for leaf wax delta D".CHEMICAL GEOLOGY 528(2019):10.
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