IEECAS OpenIR  > 加速器质谱中心
Carbon isotope composition of long chain leaf wax n-alkanes in lakesediments: A dual indicator of paleoenvironment in the Qinghai-TibetPlateau
Liu,WG(Liu,Weiguo)[1,2]; Yang,H(Yang,Hong)[3]; Wang,HY(Wang,Huanye)[1,4]; An,ZS(An,Zhisheng)[1]; Wang,Z(Wang,Zheng)[1]; Leng,Q(Leng,Qin)[3]
2015-06
Source PublicationOrganic Geochemistry
Volume83-84Pages:190-201
Subtype期刊论文
Abstract

The carbon isotope composition (d13C values) of long chain n-alkanes in lake sediments has been considered a reliable means of tracking changes in the terrigenous contribution of plants with C3 and C4 photosynthetic pathways. A key premise is that long chain leaf wax components used for isotope analysis are derived primarily from terrigenous higher plants. The role of aquatic plants in affecting d13C values of long chain n-alkanes in lacustrine sediments may, however, have long been underestimated. In this study, we found that a large portion of long chain n-alkanes (C27 and C29) in nearshore sediments of the Lake Qinghai catchment was contributed by submerged aquatic plants, which displayed a relatively positive carbon isotope composition (e.g. 26.7‰ to 15.7‰ for C29) similar to that of terrestrial C4 plants. Thus, the use of d13C values of sedimentary C27 and C29 n-alkanes for tracing terrigenous vegetation composition may create a bias toward significant overestimation/underestimation of the proportion of terrestrial C4 plants. For sedimentary C31, however, the contribution from submerged plants was minor, so that the d13C values for C31 n-alkane in surface sediments were in accord with those of the modern terrestrial vegetation in the Lake Qinghai region. Moreover, we found that changes in the d13C values of sedimentary C27 and C29 n-alkanes were closely related to water depth variation. Downcore analysis further demonstrated the significant influence of endogenous lipids in lake sediments for the interpretation of terrestrial C4 vegetation and associated environment/climate reconstruction. In conclusion, our results suggest that the d13C values of sedimentary long chain n-alkanes (C27, C29 and C31) may carry different environmental signals. While the d13C values of C31 were a reliable proxy for C4/C3 terrestrial vegetation composition, the d13C values of C27 and C29 n-alkanes may have recorded lake ecological conditions and sources of organic carbon, which might be affected by lake water depth.

KeywordLong-chain N-alkanes D13c Values Aquatic Plants Terrestrial Plants Lake Qinghai
DOI10.1016/j.orggeochem.2015.03.017
Indexed BySCI
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9437
Collection加速器质谱中心
Affiliation1.State Key Laboratory of Loess and Quaternary Geology, IEE, CAS, Xi’an 710075, China;
2.School of Human Settlement and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China;
3.Laboratory for Terrestrial Environments, College of Arts and Sciences, Bryant University, Smithfield, RI 02917, USA;
4.University of Chinese Academy of Sciences, Beijing 100049, China
Recommended Citation
GB/T 7714
Liu,WG,Yang,H,Wang,HY,et al. Carbon isotope composition of long chain leaf wax n-alkanes in lakesediments: A dual indicator of paleoenvironment in the Qinghai-TibetPlateau[J]. Organic Geochemistry,2015,83-84:190-201.
APA Liu,WG,Yang,H,Wang,HY,An,ZS,Wang,Z,&Leng,Q.(2015).Carbon isotope composition of long chain leaf wax n-alkanes in lakesediments: A dual indicator of paleoenvironment in the Qinghai-TibetPlateau.Organic Geochemistry,83-84,190-201.
MLA Liu,WG,et al."Carbon isotope composition of long chain leaf wax n-alkanes in lakesediments: A dual indicator of paleoenvironment in the Qinghai-TibetPlateau".Organic Geochemistry 83-84(2015):190-201.
Files in This Item:
File Name/Size DocType Version Access License
Carbon isotope compo(1829KB)期刊论文作者接受稿开放获取CC BY-NC-SAApplication Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Liu,WG(Liu,Weiguo)[1,2]]'s Articles
[Yang,H(Yang,Hong)[3]]'s Articles
[Wang,HY(Wang,Huanye)[1,4]]'s Articles
Baidu academic
Similar articles in Baidu academic
[Liu,WG(Liu,Weiguo)[1,2]]'s Articles
[Yang,H(Yang,Hong)[3]]'s Articles
[Wang,HY(Wang,Huanye)[1,4]]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Liu,WG(Liu,Weiguo)[1,2]]'s Articles
[Yang,H(Yang,Hong)[3]]'s Articles
[Wang,HY(Wang,Huanye)[1,4]]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.