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Methane fluxes show...
Methane fluxes show consistent temperature dependence across microbial to ecosystem scales
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- Yvon-Durocher, Gabriel (author)
- University of Exeter, Penryn, UK
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- Allen, Andrew P. (author)
- Macquarie University, Sydney, Australia,Université du Québec à Montréal, Canada
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- Bastviken, David (author)
- Linköpings universitet,Tema vatten i natur och samhälle,Filosofiska fakulteten
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- Conrad, Ralf (author)
- Max-Planck-Institute for Terrestrial Microbiology, Marburg, Germany
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- Gudasz, Cristian, 1973- (author)
- Uppsala universitet,Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,ARCUM; Department of Ecology and Genetics, Limnology, Uppsala University, Norbyvägen 18D, SE-752 36, Uppsala Sweden; Department of Ecology and Evolutionary Biology, Princeton University, Princeton, 106A Guyot Hall, New Jersey 08544, USA,Climate Impacts Research Centre (CIRC),Limnologi,Umeå University, Sweden; Uppsala University, Sweden
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- St-Pierre, Annick (author)
- University of Quebec, Canada
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- Thanh-Duc, Nguyen (author)
- University of New Hampshire, Durham, USA
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del Giorgio, Paul A. (author)
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(creator_code:org_t)
- 2014-03-19
- 2014
- English.
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In: Nature. - London : Nature Publishing Group. - 0028-0836 .- 1476-4687. ; 507:7493, s. 488-491
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Abstract
Subject headings
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- Methane (CH4) is an important greenhouse gas because it has 25 times the global warming potential of carbon dioxide (CO2) by mass over a century(1). Recent calculations suggest that atmospheric CH4 emissions have been responsible for approximately 20% of Earth's warming since pre-industrial times(2). Understanding how CH4 emissions from ecosystems will respond to expected increases in global temperature is therefore fundamental to predicting whether the carbon cycle will mitigate or accelerate climate change. Methanogenesis is the terminal step in the remineralization of organic matter and is carried out by strictly anaerobic Archaea(3). Like most other forms of metabolism, methanogenesis is temperature-dependent(4,5). However, it is not yet known how this physiological response combines with other biotic processes (for example, methanotrophy(6), substrate supply(3,7), microbial community composition(8)) and abiotic processes (for example, water-table depth(9,10)) to determine the temperature dependence of ecosystem-level CH4 emissions. It is also not known whether CH4 emissions at the ecosystem level have a fundamentally different temperature dependence than other key fluxes in the carbon cycle, such as photosynthesis and respiration. Here we use meta-analyses to show that seasonal variations in CH4 emissions from a wide range of ecosystems exhibit an average temperature dependence similar to that of CH4 production derived from pure cultures of methanogens and anaerobic microbial communities. This average temperature dependence (0.96 electron volts (eV)), which corresponds to a 57-fold increase between 0 and 30 degrees C, is considerably higher than previously observed for respiration (approximately 0.65 eV)(11) and photosynthesis (approximately 0.3 eV)(12). As a result, we show that both the emission of CH4 and the ratio of CH4 to CO2 emissions increase markedly with seasonal increases in temperature. Our findings suggest that global warming may have a large impact on the relative contributions of CO2 and CH4 to total greenhouse gas emissions from aquatic ecosystems, terrestrial wetlands and rice paddies.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Keyword
- emissions
- wetlands
- carbon
- model
- methanogenesis
- respiration
- climate
- soils
- Earth sciences
Publication and Content Type
- ref (subject category)
- art (subject category)
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