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Article Dans Une Revue Biogeosciences Discussions Année : 2012

An unknown respiration pathwaysubstantially 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 5 co-factors. Here we show that the intracellular enzymes released from dead organisms are stabilized 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 10 considered separately when studying effects of environmental factors on the C cycle because Exomet shows specific properties such as resistance to high temperature and toxics.

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Dates et versions

hal-00964427 , version 1 (28-05-2020)

Identifiants

  • HAL Id : hal-00964427 , version 1
  • PRODINRA : 186234

Citer

Vincent V. Maire, Gaël Alvarez, J J. Colombet, Aurélie A. Comby, Romain R. Despinasse, et al.. An unknown respiration pathwaysubstantially contributes to soil CO2 emissions.. Biogeosciences Discussions, 2012, 9, pp.8663-8691. ⟨hal-00964427⟩
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