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Pathways of anaerobic carbon cycling across an ombrotrophic-minerotrophic peatland gradient

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dc.contributor.author Keller, J. K. en
dc.contributor.author Bridgham, S. D. en
dc.date.accessioned 2012-02-21T13:49:16Z
dc.date.available 2012-02-21T13:49:16Z
dc.date.issued 2007
dc.identifier.citation Keller, J. K. and Bridgham, S. D. 2007. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F17904">Pathways of anaerobic carbon cycling across an ombrotrophic-minerotrophic peatland gradient</a>." <em>Limnology and Oceanography</em>. 52:96&ndash;107. en
dc.identifier.issn 0024-3590
dc.identifier.uri http://hdl.handle.net/10088/17904
dc.description.abstract Peatland soils represent globally significant stores of carbon, and understanding carbon cycling pathways in these ecosystems has important implications for global climate change. We measured aceticlastic and autotrophic methanogenesis, sulfate reduction, denitrification, and iron reduction in a bog, an intermediate fen, and a rich fen in the Upper Peninsula of Michigan for one growing season. In 3-d anaerobic incubations of slurried peat, denitrification and iron reduction were minor components of anaerobic carbon mineralization. Experiments using 14C-labeled methanogenic substrates showed that methanogenesis in these peatlands was primarily through the aceticlastic pathway, except early in the growing season in more ombrotrophic peatlands, where the autotrophic pathway was dominant or codominant. Overall, methane production was responsible for 3-70% of anaerobic carbon mineralization. Sulfate reduction accounted for 0-26% of anaerobic carbon mineralization, suggesting a rapid turnover of a very small sulfate pool. A large percentage of anaerobic carbon mineralization (from 29% to 85%) was unexplained by any measured process, which could have resulted from fermentation or possibly from the use of organic molecules (e.g., humic acids) as alternative electron acceptors. en
dc.relation.ispartof Limnology and Oceanography en
dc.title Pathways of anaerobic carbon cycling across an ombrotrophic-minerotrophic peatland gradient en
dc.type Journal Article en
dc.identifier.srbnumber 55249
rft.jtitle Limnology and Oceanography
rft.volume 52
rft.spage 96
rft.epage 107
dc.description.SIUnit serc en
dc.citation.spage 96
dc.citation.epage 107

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