An unknown oxidative metabolism substantially contributes to soil CO2 emissions
2013
Maire , Vincent(auteur de correspondance) (INRA , Clermont-Ferrand (France). UR 0874 Unité de recherche sur l'Ecosystème Prairial ) | ALVAREZ , Gaël (INRA , Clermont-Ferrand (France). UR 0874 Unité de recherche sur l'Ecosystème Prairial ) | Colombet , J (Université Clermont-Ferrand 2, Clermont-Ferrrand(France). UMR 6023) | Comby , Aurélie (INRA , Clermont-Ferrand (France). UR 0874 Unité de recherche sur l'Ecosystème Prairial ) | Despinasse , Romain (INRA , Clermont-Ferrand (France). UMR 1095 Génétique Diversité et Ecophysiologie des Céréales) | Dubreucq , Eric (INRA , Montpellier (France). UMR 1208 Ingénierie des Agropolymères et Technologies Emergentes) | Joly , M (Institut National de la Recherche Agronomique, Clermont-Ferrand(France). UREP) | Lehours , A.C. (Centre National de la Recherche Scientifique, Aubière(France). UMR 6023) | Perrier , Véronique (INRA , Montpellier (France). UMR 1208 Ingénierie des Agropolymères et Technologies Emergentes) | Shahzad , Tanvir (INRA , Clermont-Ferrand (France). UR 0874 Unité de recherche sur l'Ecosystème Prairial ) | Fontaine , Sébastien (INRA , Clermont-Ferrand (France). UR 0874 Unité de recherche sur l'Ecosystème Prairial )
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.
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