Sequential Abiotic-Biotic Processes Drive Organic Carbon Transformation in Peat Bogs

Fudyma, Jane D.; Toyoda, Jason G.; Chu, Rosalie K.; Weitz, Karl K.; Heyman, Heino M.; Eder, Elizabeth; Hoyt, David W.; Gieschen, Hans; Graf Grachet, Nathalia; Wilson, Rachel M.; Tfaily, Malak M.

doi:10.1029/2020jg006079

Title: Sequential Abiotic-Biotic Processes Drive Organic Carbon Transformation in Peat Bogs

Journal Article · Fri Jan 29 00:00:00 EST 2021 · Journal of Geophysical Research. Biogeosciences

DOI:https://doi.org/10.1029/2020jg006079· OSTI ID:1781660

^[1]; Toyoda, Jason G. ^[2]; Chu, Rosalie K. ^[2]; Weitz, Karl K. ^[2];

^[3]; Eder, Elizabeth ^[2];

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Univ. of Arizona, Tucson, AZ (United States)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL); Bruker Daltonics Inc., Billercia, MA (United States)
Department of Environmental Science The University of Arizona Tucson AZ USA
Florida State Univ., Tallahassee, FL (United States)
Univ. of Arizona, Tucson, AZ (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)

Abstract Peatlands, which store one third of the terrestrial carbon (C), are subject to large disturbances under a changing climate. It is crucial to understand how microbial and physiochemical factors affect the vulnerability of these large C stores to predict climate‐induced greenhouse gas fluxes. Here, we used a combination of mass spectrometry and spectroscopy techniques, to understand sequential biotic and abiotic degradation pathways of Sphagnum fallax leachate in an anaerobic incubation experiment, in the presence and absence of microorganisms. Removal of microorganisms was carried out by passing aqueous samples through 0.2‐µm filters. Our results revealed that S. fallax leachate degradation by abiotic reactions is a significant contributor to CO ₂ production. Further, abiotic factors, such as low pH, are responsible for partial dissolved organic carbon (DOC) degradation that produces bioavailable compounds that shift microbial metabolic pathways and stimulate respiration in peat bogs. Acid‐catalyzed hydrolysis of Sphagnum ‐ produced glycosides can provide the microbial communities with glucose and stimulate microbial respiration of DOC to CO ₂ . These results, while unique to peatlands, demonstrate the importance and underscore the complexity of sequential abiotic and biotic processes on C cycling in peat bogs. It is therefore crucial to incorporate abiotic degradation and sequential below‐ground biotic and abiotic interactions into climate models for a better prediction of the influence of climate change on DOC stability in peatlands. These findings might not be representative of other ecosystems with different environmental conditions including mineral‐rich peatlands and plant matter in surface peat horizons that comprise discrete microbial populations, and DOC composition.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1781660

Alternate ID(s):: OSTI ID: 1786687

Report Number(s):: PNNL-SA-160453

Journal Information:: Journal of Geophysical Research. Biogeosciences, Vol. 126, Issue 2; ISSN 2169-8953

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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