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Science China Earth Sciences

, Volume 61, Issue 6, pp 765–777 | Cite as

Compound-specific δD and its hydrological and environmental implication in the lakes on the Tibetan Plateau

  • Hu Liu
  • Hong Yang
  • Yunning Cao
  • Weiguo Liu
Research Paper

Abstract

The hydrogen isotopic composition (δD) 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 δD 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 δD values of C29n-alkane are correlated significantly with the lake water δD values both for algae (R2=0.85, p<0.01, n=9) and submerged plants (R2=0.90, p<0.01, n=25), indicating that δD values of these algae and submerged plants reflect the δD variation of lake water. We find that apparent hydrogen isotope fractionation factors between individual n-alkanes and water (εa/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 δD values. The δD 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 δD values with grasses around the lake (one-way ANOVA, p=0.826>0.05), suggesting that the n-alkane δD 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 δD 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 δD 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).

Keywords

n-Alkane Hydrogen isotope composition Submerged plant Algae Tibetan Plateau 

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Notes

Acknowledgements

We thank Dr. Xiangzhong Li for help with sample collection and Dr. Zheng Wang and Dr. Huanye Wang for supports with GC and GC-TC-IRMS analyses. Two anonymous reviewers are thanked for constructive comments. This study was supported by the National Natural Science Foundation of China (Grant No. 41573005), the National Basic Research Programme of China (Grant No. 2013CB955901) and Key Program of the Chinese Academy of Sciences (Grant No. QYZDY-SSWDQC001).

Supplementary material

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© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth EnvironmentChinese Academy of SciencesXi’anChina
  2. 2.University of Chinese Academy of SciencesBeijingChina
  3. 3.Laboratory for Terrestrial Environments, Department of Science and Technology, College of Arts and SciencesBryant UniversitySmithfieldUSA

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