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Compound-specific delta D and its hydrological and environmental implication in the lakes on the Tibetan Plateau
Liu, Hu1,2; Yang, Hong3; Cao, Yunning1; Liu, Weiguo1,2
2018-06-01
Source PublicationSCIENCE CHINA-EARTH SCIENCES
Volume61Issue:6Pages:765-777
SubtypeArticle
AbstractThe hydrogen isotopic composition (delta D) of n-alkanes in lacustrine sediments is widely used in palaeoenvironmental studies, but the heterogeneous origins and relative contributions of these lipids provide challenges for the interpretation of the increasing dataset as an environment and climatic proxy. We systematically investigated n-alkane delta D values from 51 submerged plants (39 Potamogeton, 1 Myriophyllum, and 11 Ruppia), 13 algae (5 Chara, 3 Cladophora, and 5 Spirogyra) and 20 terrestrial plants (10 grasses and 10 shrubs) in and around 15 lakes on the Tibetan Plateau. Our results demonstrate that delta D values of C-29 n-alkane are correlated significantly with the lake water delta D values both for algae (R (2)=0.85, p < 0.01, n=9) and submerged plants (R (2)=0.90, p < 0.01, n=25), indicating that delta D values of these algae and submerged plants reflect the delta D variation of lake water. We find that apparent hydrogen isotope fractionation factors between individual n-alkanes and water (epsilon (a/w)) are not constant among different algae and submerged plants, as well as in a single genus under different liminological conditions, indicating that the biosynthesis or environmental conditions (e.g. salinity) may affect their delta D values. The delta D values of submerged plant Ruppia in the Xiligou Lake (a closed lake) are significant enriched in D than those of terrestrial grasses around the lake (one-way ANOVA, p < 0.01), but the algae Chara in the Keluke Lake (an open lake) display similar delta D values with grasses around the lake (one-way ANOVA, p=0.826 > 0.05), suggesting that the n-alkane delta D values of the algae and submerged plants record the signal of D enrichment in lake water relative to precipitation only in closed lakes in arid and semi-arid area. For each algae and submerged plant sample, we find uniformed delta D values of different chain length n-alkanes, implying that, in combination with other proxies such as Paq and Average Chain Length, the offset between the delta D values of different chain length n-alkanes can help determine the source of sedimentary n-alkanes as well as inferring the hydrological characteristics of an ancient lake basin (open vs closed lake).
KeywordN-alkane Hydrogen Isotope Composition Submerged Plant Algae Tibetan Plateau
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1007/s11430-017-9182-2
WOS KeywordHYDROGEN ISOTOPIC COMPOSITIONS ; WAX N-ALKANES ; RATIO MASS-SPECTROMETRY ; LACUSTRINE SEDIMENTS ; TERRESTRIAL PLANTS ; DONGGI CONA ; LEAF WAXES ; H-2/H-1 FRACTIONATION ; CONTINUOUS CULTURES ; EMILIANIA-HUXLEYI
Indexed BySCI
Language英语
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000434489400009
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/5134
Collection加速器质谱中心
Affiliation1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Shaanxi, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, 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, Hu,Yang, Hong,Cao, Yunning,et al. Compound-specific delta D and its hydrological and environmental implication in the lakes on the Tibetan Plateau[J]. SCIENCE CHINA-EARTH SCIENCES,2018,61(6):765-777.
APA Liu, Hu,Yang, Hong,Cao, Yunning,&Liu, Weiguo.(2018).Compound-specific delta D and its hydrological and environmental implication in the lakes on the Tibetan Plateau.SCIENCE CHINA-EARTH SCIENCES,61(6),765-777.
MLA Liu, Hu,et al."Compound-specific delta D and its hydrological and environmental implication in the lakes on the Tibetan Plateau".SCIENCE CHINA-EARTH SCIENCES 61.6(2018):765-777.
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