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Electron donors and acceptors influence anaerobic soil organic matter mineralization in tidal marshes

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dc.contributor.author Sutton-Grier, Ariana E. en
dc.contributor.author Keller, Jason K. en
dc.contributor.author Koch, Rachel en
dc.contributor.author Gilmour, Cynthia C. en
dc.contributor.author Megonigal, J. Patrick en
dc.date.accessioned 2011-09-29T13:37:32Z
dc.date.available 2011-09-29T13:37:32Z
dc.date.issued 2011
dc.identifier.citation Sutton-Grier, Ariana E., Keller, Jason K., Koch, Rachel, Gilmour, Cynthia C., and Megonigal, J. Patrick. 2011. "<a href="https://repository.si.edu/handle/10088/17126">Electron donors and acceptors influence anaerobic soil organic matter mineralization in tidal marshes</a>." <em>Soil Biology and Biochemistry</em>. 43 (7):1576&ndash;1583. <a href="https://doi.org/10.1016/j.soilbio.2011.04.008">https://doi.org/10.1016/j.soilbio.2011.04.008</a> en
dc.identifier.issn 0038-0717
dc.identifier.uri http://hdl.handle.net/10088/17126
dc.description.abstract Anaerobic decomposition in wetland soils is carried out by several interacting microbial processes that influence carbon storage and greenhouse gas emissions. To understand the role of wetlands in the global carbon cycle, it is critical to understand how differences in both electron donor (i.e., organic carbon) and terminal electron acceptor (TEA) availability influence anaerobic mineralization of soil organic matter. In this study we manipulated electron donors and acceptors to examine how these factors influence total rates of carbon mineralization and the pathways of microbial respiration (e.g., sulfate reduction versus methanogenesis). Using a field-based reciprocal transplant of soils from brackish and freshwater tidal marshes, in conjunction with laboratory amendments of TEAs, we examined how rates of organic carbon mineralization changed when soils with different carbon contents were exposed to different TEAs. Total mineralization (the sum of CO2 + CH4 produced) on a per gram soil basis was greater in the brackish marsh soils, which had higher soil organic matter content: however, on a per gram carbon basis, mineralization was greater in the freshwater soils, suggesting that the quality of carbon inputs from the freshwater plants was higher. Overall anaerobic metabolism was higher for both soil types incubated at the brackish site where SO42- was the dominant TEA. When soils were amended with TEAs in the laboratory, more thermodynamically favorable respiration pathways typically resulted in greater organic matter mineralization (Fe(III) respiration &gt; SO42- reduction &gt; methanogenesis). These results suggest that both electron donors and acceptors play important roles in regulating anaerobic microbial mineralization of soil organic matter. (C) 2011 Elsevier Ltd. All rights reserved. en
dc.relation.ispartof Soil Biology and Biochemistry en
dc.title Electron donors and acceptors influence anaerobic soil organic matter mineralization in tidal marshes en
dc.type Journal Article en
dc.identifier.srbnumber 101252
dc.identifier.doi 10.1016/j.soilbio.2011.04.008
rft.jtitle Soil Biology and Biochemistry
rft.volume 43
rft.issue 7
rft.spage 1576
rft.epage 1583
dc.description.SIUnit Peer-Reviewed en
dc.description.SIUnit SERC en
dc.citation.spage 1576
dc.citation.epage 1583

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