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Influence of aquatic plants on the hydrogen isotope composition of sedimentary long-chain n-alkanes in the Lake Qinghai region, Qinghai-Tibet Plateau
Liu WeiGuo1,2; Yang Hong3; Wang HuanYe1; Yao Yuan2; Wang Zheng1; Cao YunNing1
2016-07-01
Source PublicationSCIENCE CHINA-EARTH SCIENCES
Volume59Issue:7Pages:1368-1377
SubtypeArticle
AbstractThe hydrogen isotopic composition (delta D) of leaf wax long-chain n-alkanes (C-27, C-29, and C-31) from lacustrine sediments has been widely applied to reconstruct terrestrial paleoclimatic and paleohydrological changes. However, few studies have addressed whether the aquatic-derived n-alkanes can affect the delta D values of lake sedimentary long-chain n-alkanes, which are usually regarded as a recorder of the terrestrial hydrological signals. Here we systematically investigated delta D values of long-chain n-alkanes from modern aquatic plants, both near-shore and off-shore surface sediments, surrounding terrestrial plant litters, as well as river water and lake water in Lake Qinghai and its satellite lakes on the northeastern Qinghai-Tibet Plateau. Our data showed that (i) delta D values of long-chain n-alkanes from aquatic plants varied from -184aEuro degrees to -132aEuro degrees for n-C-27, from -183aEuro degrees to -138aEuro degrees for n-C-29, and from -189aEuro degrees to -130aEuro degrees for n-C-31, respectively, with no significant differences among the three n-alkanes homologues; (ii) delta D values of long-chain n-alkanes from aquatic plants were generally more positive than those from surrounding terrestrial plants, possibly because that they recorded the D-enrichment of lake water in this semi-arid region; (iii) delta D values of long-chain n-alkanes from surface sediments showed significant differences among the three n-alkanes homologues, due to the larger aquatic input of n-C-27 to the sedimentary lipid pool than that of n-C-31, and (iv) n-C-27 delta D values of near-shore aquatic plants and near-shore sediments are more negative than those from off-shore as a result of lower delta D values of near-shore lake water. Our findings indicate that in this region (i) the offset between sedimentary n-C-27 and n-C-31 delta D values (Delta delta DC27-C31) could potentially be used to evaluate if sedimentary long-chain n-alkanes are derived from a single source; (ii) while delta D values of n-C-27 may be influenced by lake water hydrological changes, sedimentary n-C-31 is derived predominantly from terrestrial plants and thus its delta D can serve as a relatively reliable indicator for terrestrial paleoclimatic and paleohydrological reconstructions.
KeywordHydrogen Isotope Long-chain N-alkanes Aquatic Plants Paleohydrology Proxy Lake Qinghai
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1007/s11430-016-5263-2
WOS KeywordDELTA-D VALUES ; SUMMER MONSOON ; STABLE CARBON ; ALKYL LIPIDS ; NAM CO ; CHINA ; VARIABILITY ; RECORD ; HYDROLOGY ; CLIMATE
Indexed BySCI
Language英语
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000379345900005
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/5709
Collection加速器质谱中心
Affiliation1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China
2.Xi An Jiao Tong Univ, Sch Human Settlements & Civil Engn, Xian 710049, Peoples R China
3.Bryant Univ, Dept Sci & Technol, Coll Arts & Sci, Lab Terr Environm, Smithfield, RI 02917 USA
Recommended Citation
GB/T 7714
Liu WeiGuo,Yang Hong,Wang HuanYe,et al. Influence of aquatic plants on the hydrogen isotope composition of sedimentary long-chain n-alkanes in the Lake Qinghai region, Qinghai-Tibet Plateau[J]. SCIENCE CHINA-EARTH SCIENCES,2016,59(7):1368-1377.
APA Liu WeiGuo,Yang Hong,Wang HuanYe,Yao Yuan,Wang Zheng,&Cao YunNing.(2016).Influence of aquatic plants on the hydrogen isotope composition of sedimentary long-chain n-alkanes in the Lake Qinghai region, Qinghai-Tibet Plateau.SCIENCE CHINA-EARTH SCIENCES,59(7),1368-1377.
MLA Liu WeiGuo,et al."Influence of aquatic plants on the hydrogen isotope composition of sedimentary long-chain n-alkanes in the Lake Qinghai region, Qinghai-Tibet Plateau".SCIENCE CHINA-EARTH SCIENCES 59.7(2016):1368-1377.
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