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| Titel |
The role of endophytic methane-oxidizing bacteria in submerged Sphagnum in determining methane emissions of Northeastern Siberian tundra |
| VerfasserIn |
F. J. W. Parmentier, J. Huissteden, N. Kip, H. J. M. Camp, M. S. M. Jetten, T. C. Maximov, A. J. Dolman |
| 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 ; 8, no. 5 ; Nr. 8, no. 5 (2011-05-24), S.1267-1278 |
| Datensatznummer |
250005821
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| Publikation (Nr.) |
 copernicus.org/bg-8-1267-2011.pdf |
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| Zusammenfassung |
The role of the microbial processes governing methane emissions from tundra
ecosystems is receiving increasing attention. Recently, cooperation between
methanotrophic bacteria and submerged Sphagnum was shown to reduce
methane emissions but also to supply CO2 for photosynthesis for the
plant. Although this process was shown to be important in the laboratory, the
differences that exist in methane emissions from inundated vegetation types
with or without Sphagnum in the field have not been linked to these
bacteria before.
In this study, chamber flux measurements, an incubation study and a process
model were used to investigate the drivers and controls on the relative
difference in methane emissions between a submerged Sphagnum/sedge
vegetation type and an inundated sedge vegetation type without
Sphagnum. It was found that methane emissions in the
Sphagnum-dominated vegetation type were 50 % lower than in the
vegetation type without Sphagnum. A model sensitivity analysis showed
that these differences could not sufficiently be explained by differences in
methane production and plant transport.
The model, combined with an
incubation study, indicated that methane oxidation by endophytic bacteria,
living in cooperation with submerged Sphagnum, plays a significant
role in methane cycling at this site. This result is important for spatial
upscaling as oxidation by these bacteria is likely involved in 15 % of the
net methane emissions at this tundra site. Our findings support the notion
that methane-oxidizing bacteria are an important factor in understanding the
processes behind methane emissions in tundra. |
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