Simulated Hydrological Dynamics and Coupled Iron Redox Cycling Impact Methane Production in an Arctic Soil

Sulman, Benjamin N.; Yuan, Fengming; O'Meara, Teri; Gu, Baohua; Herndon, Elizabeth M.; Zheng, Jianqiu; Thornton, Peter E.; Graham, David E.

doi:10.1029/2021jg006662

Title: Simulated Hydrological Dynamics and Coupled Iron Redox Cycling Impact Methane Production in an Arctic Soil

Journal Article · Mon Sep 26 00:00:00 EDT 2022 · Journal of Geophysical Research. Biogeosciences

DOI:https://doi.org/10.1029/2021jg006662· OSTI ID:1892429

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Abstract The fate of organic carbon (C) in permafrost soils is important to the climate system due to the large global stocks of permafrost C. Thawing permafrost can be subject to dynamic hydrology, making redox processes an important factor controlling soil organic matter (SOM) decomposition rates and greenhouse gas production. In iron (Fe)‐rich permafrost soils, Fe(III) can serve as a terminal electron acceptor, promoting anaerobic respiration of SOM and increasing pH. Current large‐scale models of Arctic C cycling do not include Fe cycling or pH interactions. Here, a geochemical reaction model was developed by coupling Fe redox reactions and C cycling to simulate SOM decomposition, Fe(III) reduction, pH dynamics, and greenhouse gas production in permafrost soils subject to dynamic hydrology. We parameterized the model using measured CO ₂ and CH ₄ fluxes as well as changes in pH, Fe(II), and dissolved organic C concentrations from oxic and anoxic incubations of permafrost soils from polygonal permafrost sites in northern Alaska, United States. In simulations of repeated oxic‐anoxic cycles, Fe(III) reduction during anoxic periods enhanced CO ₂ production, while the net effect of Fe(III) reduction on cumulative CH ₄ fluxes depended on substrate C availability. With lower substrate availability, Fe(III) reduction decreased total CH ₄ production by further limiting available substrate. With higher substrate availability, Fe(III) reduction enhanced CH ₄ production by increasing pH. Our results suggest that interactions among Fe‐redox reactions, pH and methanogenesis are important factors in predicting CH ₄ and CO ₂ production as well as SOM decomposition rates in Fe‐rich, frequently waterlogged Arctic soils.

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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)

Grant/Contract Number:: AC05-00OR22725; AC05-76RL01830; DE‐AC05‐00OR22725; DE‐AC05‐76RL01830

OSTI ID:: 1892429

Alternate ID(s):: OSTI ID: 1894959

Journal Information:: Journal of Geophysical Research. Biogeosciences, Vol. 127, Issue 10; ISSN 2169-8953

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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