Photochemical alteration of organic carbon draining permafrost soils shifts microbial metabolic pathways and stimulates respiration

Ward, Collin P.; Nalven, Sarah G.; Crump, Byron C.; Kling, George W.; Cory, Rose M.

doi:10.1038/s41467-017-00759-2

Title: Photochemical alteration of organic carbon draining permafrost soils shifts microbial metabolic pathways and stimulates respiration

Journal Article · Tue Oct 03 00:00:00 UTC 2017 · Nature Communications

DOI: https://doi.org/10.1038/s41467-017-00759-2 · OSTI ID:1624050

^[1]; Nalven, Sarah G. ^[2]; Crump, Byron C. ^[2];

^[3];

^[4]

Univ. of Michigan, Ann Arbor, MI (United States). Earth and Environmental Sciences; Woods Hole Oceanographic Institution, Woods Hole, MA (United States). Marine Chemistry and Geochemistry; DOE/OSTI
Oregon State Univ., Corvallis, OR (United States). Earth, Ocean, and Atmospheric Sciences
Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Ecology and Evolutionary Biology
Univ. of Michigan, Ann Arbor, MI (United States). Earth and Environmental Sciences

In sunlit waters, photochemical alteration of dissolved organic carbon (DOC) impacts the microbial respiration of DOC to CO2. This coupled photochemical and biological degradation of DOC is especially critical for carbon budgets in the Arctic, where thawing permafrost soils increase opportunities for DOC oxidation to CO2 in surface waters, thereby reinforcing global warming. Here we show how and why sunlight exposure impacts microbial respiration of DOC draining permafrost soils. Sunlight significantly increases or decreases microbial respiration of DOC depending on whether photo-alteration produces or removes molecules that native microbial communities used prior to light exposure. Using high-resolution chemical and microbial approaches, we show that rates of DOC processing by microbes are likely governed by a combination of the abundance and lability of DOC exported from land to water and produced by photochemical processes, and the capacity and timescale that microbial communities have to adapt to metabolize photo-altered DOC.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1624050

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 8; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Interactions between sunlight and microorganisms influence dissolved organic matter degradation along the aquatic continuum: Interactions between sunlight and microorganisms Cory, Rose M.; Kling, George W. Limnology and Oceanography Letters, Vol. 3, Issue 3 https://doi.org/10.1002/lol2.10060	journal	February 2018
Dissolved Organic Matter Chemistry and Transport Along an Arctic Tundra Hillslope Lynch, Laurel M.; Machmuller, Megan B.; Boot, Claudia M. Global Biogeochemical Cycles, Vol. 33, Issue 1 https://doi.org/10.1029/2018gb006030	journal	January 2019
Oxygen Isotopes (δ ¹⁸ O) Trace Photochemical Hydrocarbon Oxidation at the Sea Surface Ward, Collin P.; Sharpless, Charles M.; Valentine, David L. Geophysical Research Letters, Vol. 46, Issue 12 https://doi.org/10.1029/2019gl082867	journal	June 2019
Environmental effects of ozone depletion, UV radiation and interactions with climate change: UNEP Environmental Effects Assessment Panel, update 2017 Bais, A. F.; Lucas, R. M.; Bornman, J. F. Photochemical & Photobiological Sciences, Vol. 17, Issue 2 https://doi.org/10.1039/c7pp90043k	journal	January 2018
Effects of vertical hydrodynamic mixing on photomineralization of dissolved organic carbon in arctic surface waters Li, Angang; Aubeneau, Antoine F.; King, Tyler Environmental Science: Processes & Impacts, Vol. 21, Issue 4 https://doi.org/10.1039/c8em00455b	journal	January 2019
Solar UV radiation in a changing world: roles of cryosphere–land–water–atmosphere interfaces in global biogeochemical cycles Sulzberger, B.; Austin, A. T.; Cory, R. M. Photochemical & Photobiological Sciences, Vol. 18, Issue 3 https://doi.org/10.1039/c8pp90063a	journal	January 2019
Electrochemical characterization of natural organic matter by direct voltammetry in an aprotic solvent Pavitt, Ania S.; Tratnyek, Paul G. Environmental Science: Processes & Impacts, Vol. 21, Issue 10 https://doi.org/10.1039/c9em00313d	journal	January 2019
Online supercritical fluid extraction mass spectrometry (SFE-LC-FTMS) for sensitive characterization of soil organic matter Shen, Yufeng; Zhao, Rui; Tolić, Nikola Faraday Discussions, Vol. 218 https://doi.org/10.1039/c9fd00011a	journal	January 2019
Humic surface waters of frozen peat bogs (permafrost zone) are highly resistant to bio- and photodegradation Shirokova, Liudmila S.; Chupakov, Artem V.; Zabelina, Svetlana A. Biogeosciences, Vol. 16, Issue 12 https://doi.org/10.5194/bg-16-2511-2019	journal	January 2019
Spatial gradients in the characteristics of soil-carbon fractions are associated with abiotic features but not microbial communities Sengupta, Aditi; Indivero, Julia; Gunn, Cailene Biogeosciences, Vol. 16, Issue 19 https://doi.org/10.5194/bg-16-3911-2019	journal	January 2019
Comparisons of dissolved organic matter and its optical characteristics in small low and high Arctic catchments Coch, Caroline; Juhls, Bennet; Lamoureux, Scott F. Biogeosciences, Vol. 16, Issue 23 https://doi.org/10.5194/bg-16-4535-2019	journal	January 2019
Humic surface waters of frozen peat bogs (permafrost zone) are highly resistant to bio- and photodegradation Shirokova, Liudmila S.; Chupakov, Artem V.; Zabelina, Svetlana A. Biogeosciences Discussions https://doi.org/10.5194/bg-2018-528	posted_content	January 2019

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