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Carbon inputs from riparian vegetation limit oxidation of physically-bound organic carbon via biochemical and thermodynamic processes

View ORCID ProfileEmily B. Graham, View ORCID ProfileMalak M. Tfaily, View ORCID ProfileAlex R. Crump, View ORCID ProfileAmy E. Goldman, View ORCID ProfileLisa Bramer, View ORCID ProfileEvan Arntzen, View ORCID ProfileElvira Romero, C. Tom Resch, View ORCID ProfileDavid W. Kennedy, View ORCID ProfileJames C. Stegen
doi: https://doi.org/10.1101/105486
Emily B. Graham
Pacific Northwest National Laboratory, Richland, WA USA
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Malak M. Tfaily
Environmental Molecular Science Laboratory, Richland, WA USA
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Alex R. Crump
Pacific Northwest National Laboratory, Richland, WA USA
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Amy E. Goldman
Pacific Northwest National Laboratory, Richland, WA USA
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Lisa Bramer
Pacific Northwest National Laboratory, Richland, WA USA
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Evan Arntzen
Pacific Northwest National Laboratory, Richland, WA USA
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Elvira Romero
Pacific Northwest National Laboratory, Richland, WA USA
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C. Tom Resch
Pacific Northwest National Laboratory, Richland, WA USA
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David W. Kennedy
Pacific Northwest National Laboratory, Richland, WA USA
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James C. Stegen
Pacific Northwest National Laboratory, Richland, WA USA
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Abstract

In light of increasing terrestrial carbon (C) transport across aquatic boundaries, the mechanisms governing organic carbon (OC) oxidation along terrestrial-aquatic interfaces are crucial to future climate predictions. Here, we investigate the biochemistry, metabolic pathways, and thermodynamics corresponding to OC oxidation in the Columbia River corridor using ultra-high resolution C characterization. We leverage natural vegetative differences to encompass variation in terrestrial C inputs. Our results suggest that decreases in terrestrial C deposition associated with diminished riparian vegetation induce oxidation of physically -bound OC. We also find that contrasting metabolic pathways oxidize OC in the presence and absence of vegetation and—in direct conflict with the ‘priming’ concept—that inputs of water-soluble and thermodynamically favorable terrestrial OC protects bound-OC from oxidation. In both environments, the most thermodynamically favorable compounds appear to be preferentially oxidized regardless of which OC pool microbiomes metabolize. In turn, we suggest that the extent of riparian vegetation causes sediment microbiomes to locally adapt to oxidize a particular pool of OC, but that common thermodynamic principles govern the oxidation of each pool (i.e., water-soluble or physically-bound). Finally, we propose a mechanistic conceptualization of OC oxidation along terrestrial-aquatic interfaces that can be used to model heterogeneous patterns of OC loss under changing land cover distributions.

  • Riparian vegetation protects bound-OC stocks

  • Biochemical processes associated with OC oxidation vary with vegetation conditions

  • Common thermodynamic principles underlie OC oxidation regardless of vegetation conditions

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted October 15, 2017.
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Carbon inputs from riparian vegetation limit oxidation of physically-bound organic carbon via biochemical and thermodynamic processes
Emily B. Graham, Malak M. Tfaily, Alex R. Crump, Amy E. Goldman, Lisa Bramer, Evan Arntzen, Elvira Romero, C. Tom Resch, David W. Kennedy, James C. Stegen
bioRxiv 105486; doi: https://doi.org/10.1101/105486
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Carbon inputs from riparian vegetation limit oxidation of physically-bound organic carbon via biochemical and thermodynamic processes
Emily B. Graham, Malak M. Tfaily, Alex R. Crump, Amy E. Goldman, Lisa Bramer, Evan Arntzen, Elvira Romero, C. Tom Resch, David W. Kennedy, James C. Stegen
bioRxiv 105486; doi: https://doi.org/10.1101/105486

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