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| Titel |
Non-microbial methane formation in oxic soils |
| VerfasserIn |
A. Jugold, F. Althoff, M. Hurkuck, M. Greule, K. Lenhart, J. Lelieveld  , F. Keppler |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 12 ; Nr. 9, no. 12 (2012-12-20), S.5291-5301 |
| Datensatznummer |
250007471
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| Publikation (Nr.) |
 copernicus.org/bg-9-5291-2012.pdf |
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| Zusammenfassung |
Methane plays an important role as a radiatively and chemically active gas
in our atmosphere. Until recently, sources of atmospheric methane in the
biosphere have been attributed to strictly anaerobic microbial processes
during degradation of organic matter. However, a large fraction of methane
produced in the anoxic soil layers does not reach the atmosphere due to
methanotrophic consumption in the overlaying oxic soil. Although methane
fluxes from aerobic soils have been observed, an alternative source other
than methanogenesis has not been identified thus far.
Here we provide evidence for non-microbial methane formation in soils under
oxic conditions. We found that soils release methane upon heating and other
environmental factors like ultraviolet irradiation, and drying-rewetting
cycles. We suggest that chemical formation of methane during degradation of
soil organic matter may represent the missing soil source that is needed to
fully understand the methane cycle in aerobic soils. Although the emission
fluxes are relatively low when compared to those from wetlands, they may be
important in warm and wet regions subjected to ultraviolet radiation. We
suggest that this methane source is highly sensitive to global change. |
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