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Stable carbon isotope characteristics of different plant species and surface soil in arid regions |
Jianying MA1,2, Wei SUN1, Huiwen ZHANG4, Dunsheng XIA1, Chengbang AN4, Fahu CHEN4() |
1. Dunhuang Gobi and Desert Ecology and Environment Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2. Department of Botany, University of Wyoming, Laramie, WY 82071, USA; 3. Department of Renewable Resources, University of Wyoming, Laramie, WY 82071, USA; 4. Key Laboratory of Western China’s Environmental System of Ministry of Education, Lanzhou University, Lanzhou 730000, China |
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Abstract The stable carbon isotope composition in surface soil organic matter (δ13Csoil) contains integrative information on the carbon isotope composition of the standing terrestrial plants (δ13Cleaf). In order to obtain valuable vegetation information from the δ13C of terrestrial sediment, it is necessary to understand the relationship between the δ13C value in modern surface soil and the standing vegetation. In this paper, we studied the δ13C value in modern surface soil organic matter and standing vegetation in arid areas in China, Australia and the United States. The isotopic discrepancy between δ13Csoil and δ13Cleaf of the standing dominant vegetation was examined in those different arid regions. The results show that the δ13Csoil values were consistently enriched compared to the δ13Cleaf. The δ13Cleaf values were positively correlated with δ13Csoil, which suggests that the interference of microorganisms and hydrophytes on the isotopic composition of surface soil organic matter during soil organic matter formation could be ignored in arid regions. The averaged discrepancy between δ13Csoil and δ13Cleaf is about 1.71‰ in Tamarix L. in the Tarim Basin in China, 1.50‰ in Eucalytus near Orange in Australia and 1.22‰ in Artemisia in Saratoga in the United States, which are different from the results of other studies. The results indicate that the discrepancies in the δ13C value between surface soil organic matter and standing vegetation were highly influenced by the differences in geophysical location and the dominant species of the studied ecosystems. We suggest that caution should be taken when organic matter δ13C in terrestrial sediment is used to extract paleovegetation information (C3/C4 vegetation composition), as the δ13C in soil organic matter is not only determined by the ratio of C3/C4 species, but also profoundly affected by climate change induced variation in the δ13C in dominant species.
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Keywords
stable carbon isotope composition
surface soil
vegetation composition
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Corresponding Author(s):
CHEN Fahu,Email:fhchen@lzu.edu.cn
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Issue Date: 05 March 2009
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