globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-014-0054-3
Scopus记录号: 2-s2.0-84925496027
论文题名:
Minor stable carbon isotope fractionation between respired carbon dioxide and bulk soil organic matter during laboratory incubation of topsoil
作者: Breecker D.O.; Bergel S.; Nadel M.; Tremblay M.M.; Osuna-Orozco R.; Larson T.E.; Sharp Z.D.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 123, 期:2018-01-02
起始页码: 83
结束页码: 98
语种: 英语
英文关键词: Carbon isotopes ; CO2 ; Fractionation ; Incubation ; Organic matter ; Soil
英文摘要: A common assumption in paleoenvironmental reconstructions using soils is that the carbon isotope composition of soil-respired CO2 is equivalent to the carbon isotope composition of bulk soil organic matter (SOM). However, the occurrence of a non-zero per mil carbon isotope enrichment factor between CO2 and SOM (εCO2-SOM) during soil respiration is the most widely accepted explanation for the down-profile increase in SOM δ13C values commonly observed in well-drained soils. In order to shed light on this apparent discrepancy, we incubated soil samples collected from the top 2 cm of soils with pure C3 vegetation and compared the δ13C values of soil-respired CO2 to the δ13C values of bulk SOM. Our results show near-zero (Formula presented.) values (−0.3 to 0.4 ‰), supporting the use of paleosol organic matter as a proxy for paleo soil-respired CO2. Significantly more negative (εCO2-SOM) values are required to explain the typical δ13C profiles of SOM in well-drained soils. Therefore our results also suggest that typical SOM δ13C profiles result from either (1) a process other than carbon isotope fractionation between CO2 and SOM during soil respiration or (2) (Formula presented.) values that become increasingly negative as SOM matures. © 2014, Springer International Publishing Switzerland.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83528
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: The Department of Geological Sciences, The University of Texas at Austin, Austin, TX, United States; Department of Geology, Macalester College, Saint Paul, MN, United States; Department of Earth and Planetary Science, University of California, Berkeley, Berkeley, CA, United States; Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, United States; The Department of Earth and Planetary Sciences, The University of New Mexico, Albuquerque, NM, United States

Recommended Citation:
Breecker D.O.,Bergel S.,Nadel M.,et al. Minor stable carbon isotope fractionation between respired carbon dioxide and bulk soil organic matter during laboratory incubation of topsoil[J]. Biogeochemistry,2015-01-01,123(2018-01-02)
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