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Choosing a suitable epsilon(w-p) by distinguishing the dominant plant sources in sediment records using a new Pta index and estimating the paleo-delta D-p spatial distribution in China
Wang, Zheng1; Liu, Hu1,2; Cao, Yunning1
2018-07-01
Source PublicationORGANIC GEOCHEMISTRY
Volume121Issue:1Pages:161-168
SubtypeArticle
AbstractThe hydrogen isotopic composition of plant wax (delta D-wax) inherits the isotopic values of the source water and isotopic fractionation that take place in lipid biosynthesis. The delta D-wax values of n-alkanes or n-acids in sediment records are considered to be effective paleo-delta D for precipitation proxies for different timescales. However, the vegetation effect also contributes substantially to the apparent fractionation values (epsilon(w-p)) between the precipitation and plant. Therefore, a method for evaluating the dominant plant source in the sediment records is key for reconstructing a reliable paleo-delta D-p record. In this study, based on field data from the extremely arid Qaidam Basin and the semi-arid central Chinese Loess Plateau (CLP), a plant type index (Pta), based on the traditional P-aq and n-alkane C-31/C-29 index, was used to evaluate the dominant plant type that contributed to the sediments. In the arid and semi-arid region, the Pta values of the aquatic plants were <90, while the shrub Pta ranged from 90 to 180 and the grass Pta was >180. A test on contemporary soils and surface lake sediments also showed that the Pta index could estimate the regional vegetation distribution in modern environments. We also evaluated the dominant n-alkane source for four sediment records in China during the last millennium and reconstructed a regional paleo-delta D-p by choosing a different epsilon(w-p). The estimated paleo-delta D-p values showed a good correlation with the modern regional summer delta D-p. We suggest that a large number of field studies are needed to improve the Pta index for quantitatively calculating the precise ratios for various plant sources. Such data would play a key role in improving hydrogen isotopic hydroclimatic research. (C) 2018 Elsevier Ltd. All rights reserved.
KeywordLeaf Delta D-wax Vegetation Effect Pta Index Paleo-delta D-p Reconstruction Arid Semi-arid
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.orggeochem.2018.01.002
WOS KeywordHYDROGEN ISOTOPIC COMPOSITIONS ; N-ALKANE DISTRIBUTIONS ; QINGHAI-TIBET PLATEAU ; LAKE-SEDIMENTS ; D VALUES ; TERRESTRIAL PLANTS ; LIPID BIOMARKERS ; AQUATIC PLANTS ; LEAF WAXES ; RECONSTRUCTION
Indexed BySCI
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000434096000015
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Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/5140
Collection加速器质谱中心
Affiliation1.Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, IEE, Xian 710075, Shaanxi, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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Wang, Zheng,Liu, Hu,Cao, Yunning. Choosing a suitable epsilon(w-p) by distinguishing the dominant plant sources in sediment records using a new Pta index and estimating the paleo-delta D-p spatial distribution in China[J]. ORGANIC GEOCHEMISTRY,2018,121(1):161-168.
APA Wang, Zheng,Liu, Hu,&Cao, Yunning.(2018).Choosing a suitable epsilon(w-p) by distinguishing the dominant plant sources in sediment records using a new Pta index and estimating the paleo-delta D-p spatial distribution in China.ORGANIC GEOCHEMISTRY,121(1),161-168.
MLA Wang, Zheng,et al."Choosing a suitable epsilon(w-p) by distinguishing the dominant plant sources in sediment records using a new Pta index and estimating the paleo-delta D-p spatial distribution in China".ORGANIC GEOCHEMISTRY 121.1(2018):161-168.
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