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Title: Stoichiometry and temperature sensitivity of methanogenesis and CO 2 production from saturated polygonal tundra in Barrow, Alaska

Journal Article · · Global Change Biology
DOI:https://doi.org/10.1111/gcb.12762· OSTI ID:1185515
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  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biosciences Division
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Environmental Sciences Division

Abstract Arctic permafrost ecosystems store ~50% of global belowground carbon (C) that is vulnerable to increased microbial degradation with warmer active layer temperatures and thawing of the near surface permafrost. We used anoxic laboratory incubations to estimate anaerobic CO 2 production and methanogenesis in active layer (organic and mineral soil horizons) and permafrost samples from center, ridge and trough positions of water‐saturated low‐centered polygon in Barrow Environmental Observatory, Barrow AK , USA . Methane ( CH 4 ) and CO 2 production rates and concentrations were determined at −2, +4, or +8 °C for 60 day incubation period. Temporal dynamics of CO 2 production and methanogenesis at −2 °C showed evidence of fundamentally different mechanisms of substrate limitation and inhibited microbial growth at soil water freezing points compared to warmer temperatures. Nonlinear regression better modeled the initial rates and estimates of Q 10 values for CO 2 that showed higher sensitivity in the organic‐rich soils of polygon center and trough than the relatively drier ridge soils. Methanogenesis generally exhibited a lag phase in the mineral soils that was significantly longer at −2 °C in all horizons. Such discontinuity in CH 4 production between −2 °C and the elevated temperatures (+4 and +8 °C) indicated the insufficient representation of methanogenesis on the basis of Q 10 values estimated from both linear and nonlinear models. Production rates for both CH 4 and CO 2 were substantially higher in organic horizons (20% to 40% wt. C) at all temperatures relative to mineral horizons (<20% wt. C). Permafrost horizon (~12% wt. C) produced ~5‐fold less CO 2 than the active layer and negligible CH 4 . High concentrations of initial exchangeable Fe( II ) and increasing accumulation rates signified the role of iron as terminal electron acceptors for anaerobic C degradation in the mineral horizons.

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
OSTI ID:
1185515
Alternate ID(s):
OSTI ID: 1401357
Journal Information:
Global Change Biology, Vol. 21, Issue 2; ISSN 1354-1013
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 65 works
Citation information provided by
Web of Science

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Cited By (11)

Determinants of carbon release from the active layer and permafrost deposits on the Tibetan Plateau journal October 2016
Methane production as key to the greenhouse gas budget of thawing permafrost journal March 2018
Impacts of temperature and soil characteristics on methane production and oxidation in Arctic tundra journal January 2018
Use of in-field bioreactors demonstrate groundwater filtration influences planktonic bacterial community assembly, but not biofilm composition journal March 2018
Modeling anaerobic soil organic carbon decomposition in Arctic polygon tundra: insights into soil geochemical influences on carbon mineralization journal January 2019
Landscape topography structures the soil microbiome in arctic polygonal tundra journal February 2018
Constraints on microbial communities, decomposition and methane production in deep peat deposits journal February 2020
Geochemical drivers of organic matter decomposition in arctic tundra soils journal December 2015
Effects of Grazing Pattern on Ecosystem Respiration and Methane Flux in a Sown Pasture in Inner Mongolia, China journal December 2018
Performance, kinetic, and biodegradation pathway evaluation of anaerobic fixed film fixed bed reactor in removing phthalic acid esters from wastewater journal February 2017
Microbial Community and Functional Gene Changes in Arctic Tundra Soils in a Microcosm Warming Experiment journal September 2017