Inhibition of Methylmercury and Methane Formation by Nitrous Oxide in Arctic Tundra Soil Microcosms

Zhang, Lijie; Yin, Yongchao; Sun, Yanchen; Liang, Xujun; Graham, David E.; Pierce, Eric M.; Löffler, Frank E.; Gu, Baohua

doi:10.1021/acs.est.2c09457

Title: Inhibition of Methylmercury and Methane Formation by Nitrous Oxide in Arctic Tundra Soil Microcosms

Journal Article · Tue Mar 28 00:00:00 EDT 2023 · Environmental Science and Technology

DOI:https://doi.org/10.1021/acs.est.2c09457· OSTI ID:1963735

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Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States, Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States, Center for Environmental Biotechnology, University of Tennessee, Knoxville, Tennessee 37996, United States, Department of Microbiology, University of Tennessee, Knoxville, Tennessee 37996, United States
Center for Environmental Biotechnology, University of Tennessee, Knoxville, Tennessee 37996, United States, Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States, Center for Environmental Biotechnology, University of Tennessee, Knoxville, Tennessee 37996, United States, Department of Microbiology, University of Tennessee, Knoxville, Tennessee 37996, United States, Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States, Department of Biosystems Engineering and Soil Science, University of Tennessee, Knoxville, Tennessee 37996, United States
Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States, Department of Biosystems Engineering and Soil Science, University of Tennessee, Knoxville, Tennessee 37996, United States

Climate warming causes permafrost thaw predicted to increase toxic methylmercury (MeHg) and greenhouse gas [i.e., methane (CH₄), carbon dioxide (CO₂), and nitrous oxide (N₂O)] formation. A microcosm incubation study with Arctic tundra soil over 145 days demonstrates that N₂O at 0.1 and 1 mM markedly inhibited microbial MeHg formation, methanogenesis, and sulfate reduction, while it slightly promoted CO₂ production. Microbial community analyses indicate that N₂O decreased the relative abundances of methanogenic archaea and microbial clades implicated in sulfate reduction and MeHg formation. Following depletion of N₂O, both MeHg formation and sulfate reduction rapidly resumed, whereas CH₄ production remained low, suggesting that N₂O affected susceptible microbial guilds differently. MeHg formation strongly coincided with sulfate reduction, supporting prior reports linking sulfate-reducing bacteria to MeHg formation in the Arctic soil. Here, this research highlights complex biogeochemical interactions in governing MeHg and CH₄ formation and lays the foundation for future mechanistic studies for improved predictive understanding of MeHg and greenhouse gas fluxes from thawing permafrost ecosystems.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; 1831599

OSTI ID:: 1963735

Alternate ID(s):: OSTI ID: 1968707

Journal Information:: Environmental Science and Technology, Journal Name: Environmental Science and Technology Vol. 57 Journal Issue: 14; ISSN 0013-936X

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Inhibition of Methylmercury and Methane Formation by Nitrous Oxide in Arctic Tundra Soil Microcosms

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