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Biogeochemistry

, Volume 123, Issue 1–2, pp 83–98 | Cite as

Minor stable carbon isotope fractionation between respired carbon dioxide and bulk soil organic matter during laboratory incubation of topsoil

  • D. O. Breecker
  • S. Bergel
  • M. Nadel
  • M. M. Tremblay
  • R. Osuna-Orozco
  • T. E. Larson
  • Z. D. Sharp
Article

Abstract

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 (\(\varepsilon_{{{\text{CO}}_{ 2} - {\text{SOM}}}}\)) 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 \(\varepsilon_{{{\text{CO}}_{ 2} - {\text{SOM}}}}\) values (−0.3 to 0.4 ‰), supporting the use of paleosol organic matter as a proxy for paleo soil-respired CO2. Significantly more negative \(\varepsilon_{{{\text{CO}}_{ 2} - {\text{SOM}}}}\) 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) \(\varepsilon_{{{\text{CO}}_{ 2} - {\text{SOM}}}}\) values that become increasingly negative as SOM matures.

Keywords

Soil Organic matter CO2 Carbon isotopes Incubation Fractionation 

Notes

Acknowledgments

We thank the Katharine Ordway Natural History Study Area for access and D. Fortner for logistical help. Comments from three anonymous reviewers helped substantially improve the manuscript. NSF-REU 0852029 supported this research. Data reported in this paper are available from the International Soil Carbon Network (http://www.fluxdata.org/nscn/SitePages/ISCN.aspx).

Supplementary material

10533_2014_54_MOESM1_ESM.docx (131 kb)
Supplementary material 1 (DOCX 131 kb)
10533_2014_54_MOESM2_ESM.docx (95 kb)
Supplementary material 2 (DOCX 94 kb)

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • D. O. Breecker
    • 1
  • S. Bergel
    • 1
  • M. Nadel
    • 1
    • 2
  • M. M. Tremblay
    • 1
    • 3
  • R. Osuna-Orozco
    • 4
    • 5
  • T. E. Larson
    • 1
  • Z. D. Sharp
    • 5
  1. 1.The Department of Geological SciencesThe University of Texas at AustinAustinUSA
  2. 2.Department of GeologyMacalester CollegeSaint PaulUSA
  3. 3.Department of Earth and Planetary ScienceUniversity of California, BerkeleyBerkeleyUSA
  4. 4.Scripps Institution of OceanographyUniversity of California San DiegoLa JollaUSA
  5. 5.The Department of Earth and Planetary SciencesThe University of New MexicoAlbuquerqueUSA

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