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Frontiers of Earth Science in China : Volume 2

Frontiers of Earth Science in China : Volume 1

Stable carbon isotope characteristics of different plant species and surface soil in arid regions

Content Provider	Springer Nature Link
Author	Ma, Jianying Sun, Wei Zhang, Huiwen Xia, Dunsheng An, Chengbang Chen, Fahu
Copyright Year	2009
Abstract	The stable carbon isotope composition in surface soil organic matter (δ$^{13}$Csoil) contains integrative information on the carbon isotope composition of the standing terrestrial plants (δ$^{13}$Cleaf). In order to obtain valuable vegetation information from the δ$^{13}$C of terrestrial sediment, it is necessary to understand the relationship between the δ$^{13}$C value in modern surface soil and the standing vegetation. In this paper, we studied the δ$^{13}$C value in modern surface soil organic matter and standing vegetation in arid areas in China, Australia and the United States. The isotopic discrepancy between δ$^{13}$Csoil and δ$^{13}$Cleaf of the standing dominant vegetation was examined in those different arid regions. The results show that the δ$^{13}$Csoil values were consistently enriched compared to the δ$^{13}$Cleaf. The δ$^{13}$Cleaf values were positively correlated with δ$^{13}$Csoil, 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 δ$^{13}$Csoil and δ$^{13}$Cleaf 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 δ$^{13}$C 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 δ$^{13}$C in terrestrial sediment is used to extract paleovegetation information (C$_{3}$/C$_{4}$ vegetation composition), as the δ$^{13}$C in soil organic matter is not only determined by the ratio of C$_{3}$/C$_{4}$ species, but also profoundly affected by climate change induced variation in the δ$^{13}$C in dominant species.
Starting Page	107
Ending Page	111
Page Count	5
File Format	PDF
ISSN	16737385
Journal	Frontiers of Earth Science in China
Volume Number	3
Issue Number	1
e-ISSN	16737490
Language	English
Publisher	SP Higher Education Press
Publisher Date	2009-01-04
Publisher Institution	Chinese Universities
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	stable carbon isotope composition surface soil vegetation composition Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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