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| Titel |
Stable carbon isotope fractionation during methanogenesis in three boreal peatland ecosystems |
| VerfasserIn |
P. E. Galand, K. Yrjälä, R. Conrad |
| 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 ; 7, no. 11 ; Nr. 7, no. 11 (2010-11-29), S.3893-3900 |
| Datensatznummer |
250005077
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| Publikation (Nr.) |
 copernicus.org/bg-7-3893-2010.pdf |
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| Zusammenfassung |
| The degradation of organic matter to CH4 and CO2 was investigated
in three different boreal peatland systems in Finland, a mesotrophic fen
(MES), an oligotrophic fen (OLI), and an ombrotrophic peat (OMB). MES had
similar production rates of CO2 and CH4, but the two nutrient-poor
peatlands (OLI and OMB) produced in general more CO2 than CH4.
δ13C analysis of CH4 and CO2 in the presence and
absence methyl fluoride (CH3F), an inhibitor of acetoclastic
methanogenesis, showed that CH4 was predominantly produced by
hydrogenotrophic methanogenesis and that acetoclastic methanogenesis only
played an important role in MES. These results, together with our
observations concerning the collective inhibition of CH4 and CO2
production rates by CH3F, indicate that organic matter was degraded
through different paths in the mesotrophic and the nutrient-poor peatlands.
In the mesotrophic fen, the major process is canonical fermentation followed
by acetoclastic and hydrogenotrophic methanogenesis, while in the
nutrient-poor peat, organic matter was apparently degraded to a large extent
by a different path which finally involved hydrogenotrophic methanogenesis.
Our data suggest that degradation of organic substances in the oligotrophic
environments was incomplete and involved the use of organic compounds as
oxidants. |
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