The role of endophytic methane-oxidizing bacteria in submerged Sphagnum in determining methane emissions of Northeastern Siberian tundra
Abstract. The role of the microbial processes governing methane emissions from tundra ecosystems is receiving in-creasing attention. Recently, cooperation between methan-otrophic bacteria and submerged Sphagnum was shown to reduce methane emissions but also to supply CO2 for pho-tosynthesis for the...
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| Format: | Text |
| Language: | English |
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2011
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.636.5476 http://www.biogeosciences.net/8/1267/2011/bg-8-1267-2011.pdf |
| Summary: | Abstract. The role of the microbial processes governing methane emissions from tundra ecosystems is receiving in-creasing attention. Recently, cooperation between methan-otrophic bacteria and submerged Sphagnum was shown to reduce methane emissions but also to supply CO2 for pho-tosynthesis 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 incuba-tion 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 Sphag-num. It was found that methane emissions in the Sphagnum-dominated vegetation type were 50 % lower than in the veg-etation type without Sphagnum. A model sensitivity anal-ysis showed that these differences could not sufficiently be explained by differences in methane production and plant transport. |
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