Biogeosciences
Biogeosciences
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Articles | Volume 13, issue 22
Articles | Volume 13, issue 22
https://doi.org/10.5194/bg-13-6353-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bg-13-6353-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Articles | Volume 13, issue 22
Research article
 | 
28 Nov 2016
Research article |  | 28 Nov 2016

Soil carbon dioxide emissions controlled by an extracellular oxidative metabolism identifiable by its isotope signature

Benoit Kéraval, Anne Catherine Lehours, Jonathan Colombet, Christian Amblard, Gaël Alvarez, and Sébastien Fontaine

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Short summary
Soil CO2 emissions are a major determinant of the carbon (C) cycle and its interactions with climate. Here, we show that soil CO2 emissions have two origins: (1) the well-known microbial cell respiration and (2) an extracellular oxidative metabolism (EXOMET) carried out by soil-stabilized enzymes and mineral catalysts. These two metabolisms have distinct C isotope signatures, allowing their detection in soil CO2 emissions.
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