An unknown oxidative metabolism substantially contributes to soil CO2 emissions
| Autor: | Aurélie Comby, Tanvir Shahzad, Vincent Maire, Gaël Alvarez, J Colombet, Sébastien Fontaine, A. C. Lehours, M Joly, Véronique Perrier, Romain Despinasse, Eric Dubreucq |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
chemistry.chemical_classification
010504 meteorology & atmospheric sciences Ecology 04 agricultural and veterinary sciences Metabolism Biology 01 natural sciences Carbon cycle Soil respiration Enzyme chemistry 13. Climate action Environmental chemistry Respiration Soil water 040103 agronomy & agriculture Extracellular 0401 agriculture forestry and fisheries Ecology Evolution Behavior and Systematics Intracellular 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Biogeosciences. 10:1155-1167 |
| ISSN: | 1726-4189 |
| DOI: | 10.5194/bg-10-1155-2013 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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