An unknown oxidative metabolism substantially contributes to soil CO2 emissions

Maire, V.; Alvarez, G.; Colombet, J.; Comby, A.; Despinasse, R.; Dubreucq, E.; Joly, M.; Lehours, A.-C.; Perrier, V.; Shahzad, T.; Fontaine, S.

doi:10.5194/bg-10-1155-2013

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An unknown oxidative metabolism substantially contributes to soil CO₂ emissions

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http://dx.doi.org/10.5194/bg-10-1155-2013
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Maire, V., Alvarez, G., Colombet, J., Comby, A., Despinasse, R., Dubreucq, E., et al. (2013). An unknown oxidative metabolism substantially contributes to soil CO₂ emissions. Biogeosciences, 10, 1155-1167. doi:10.5194/bg-10-1155-2013.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0014-4DB5-2

Abstract

The respiratory release of CO2 from soils is a major determinant of the global carbon cycle. It is traditionally considered that this respiration is an intracellular metabolism consisting of complex biochemical reactions carried out by numerous enzymes and co-factors. Here we show that the endoenzymes released from dead organisms are stabilised in soils and have access to suitable substrates and co-factors to permit function. These enzymes reconstitute an extracellular oxidative metabolism (EXOMET) that may substantially contribute to soil respiration (16 to 48% of CO2 released from soils in the present study). EXOMET and respiration from living organisms should be considered separately when studying effects of environmental factors on the C cycle because EXOMET shows specific properties such as resistance to high temperature and toxic compounds.