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An unknown oxidative metabolism substantially contributes to soil CO 2 emissions

V. Maire,G. Alvarez,J. Colombet,Aurélie Comby,Romain Despinasse,E. Dubreucq,M. Joly,A. Lehours,V. Perrier,Tanvir Shahzad,S. Fontaine

Published 2013 in Biogeosciences

ABSTRACT

The respiratory release of CO2 from soils is a ma- jor 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 con- tribute to soil respiration (16 to 48 % of CO2 released from soils in the present study). E XOMET and respiration from liv- ing organisms should be considered separately when study- ing effects of environmental factors on the C cycle because EXOMET shows specific properties such as resistance to high temperature and toxic compounds.

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