An unknown oxidative metabolism substantially contributes to soil CO2 emissions - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Biogeosciences Année : 2013

An unknown oxidative metabolism substantially contributes to soil CO2 emissions

Résumé

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.

Mots clés

Fichier principal
Vignette du fichier
Maire et al. - 2013 - An unknown oxidative metabolism substantially cont_1.pdf (864.88 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01190438 , version 1 (29-05-2020)

Identifiants

Citer

Vincent Maire, Gaël Alvarez, J Colombet, Aurélie Comby, Romain Despinasse, et al.. An unknown oxidative metabolism substantially contributes to soil CO2 emissions. Biogeosciences, 2013, 10, pp.1155-1167. ⟨10.5194/bg-10-1155-2013⟩. ⟨hal-01190438⟩
208 Consultations
71 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More