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Title: Adding stable carbon isotopes improves model representation of the role of microbial communities in peatland methane cycling

Abstract

Climate change is expected to have significant and uncertain impacts on methane (CH4) emissions from northern peatlands. Biogeochemical models can extrapolate site-specific CH4 measurements to larger scales and predict responses of CH4 emissions to environmental changes. However, these models include considerable uncertainties and limitations in representing CH4 production, consumption, and transport processes. To improve predictions of CH4 transformations, we incorporated acetate and stable carbon (C) isotopic dynamics associated with CH4 cycling into a biogeochemistry model, DNDC. By including these new features, DNDC explicitly simulates acetate dynamics and the relative contribution of acetotrophic and hydrogenotrophic methanogenesis (AM and HM) to CH4 production, and predicts the C isotopic signature (δ13C) in soil C pools and emitted gases. When tested against biogeochemical and microbial community observations at two sites in a zone of thawing permafrost in a subarctic peatland in Sweden, the new formulation substantially improved agreement with CH4 production pathways and δ13C in emitted CH413C-CH4), a measure of the integrated effects of microbial production and consumption, and of physical transport. We also investigated the sensitivity of simulated δ13C-CH4 to C isotopic composition of substrates and, to fractionation factors for CH4 production (αAM and αHM), CH4 oxidation (αMO), and plant-mediated CH4 transportmore »TP). The sensitivity analysis indicated that the δ13C-CH4 is highly sensitive to the factors associated with microbial metabolism (αAM, αHM, and αMO). The model framework simulating stable C isotopic dynamics provides a robust basis for better constraining and testing microbial mechanisms in predicting CH4 cycling in peatlands.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5];  [6]; ORCiD logo [7];  [8];  [9];  [1]
  1. Earth Systems Research Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire Durham New Hampshire USA
  2. Thomas H. Gosnell School of Life Sciences, Rochester Institute of Technology, One Lomb Memorial Drive Rochester New York USA
  3. Department of Earth, Ocean and Atmospheric Science Florida State University Tallahassee Florida USA
  4. Department of Geological Sciences Stockholm University Stockholm Sweden
  5. Earth Systems Research Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire Durham New Hampshire USA, Department of Earth Sciences University of New Hampshire Durham New Hampshire USA
  6. Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences University of Queensland Brisbane Queensland Australia
  7. Department of Microbiology The Ohio State University Columbus Ohio USA
  8. Department of Biological Sciences University of Massachusetts Lowell Lowell Massachusetts USA
  9. Department of Ecology and Evolutionary Biology University of Arizona Tucson Arizona USA
Publication Date:
Research Org.:
Univ. of Arizona, Tucson, AZ (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1363819
Alternate Identifier(s):
OSTI ID: 1363820; OSTI ID: 1393576
Grant/Contract Number:  
DE‐SC0004632; DE‐SC0010580; SC0004632; SC0010580
Resource Type:
Journal Article: Published Article
Journal Name:
Journal of Advances in Modeling Earth Systems
Additional Journal Information:
Journal Name: Journal of Advances in Modeling Earth Systems Journal Volume: 9 Journal Issue: 2; Journal ID: ISSN 1942-2466
Publisher:
American Geophysical Union (AGU)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES

Citation Formats

Deng, Jia, McCalley, Carmody K., Frolking, Steve, Chanton, Jeff, Crill, Patrick, Varner, Ruth, Tyson, Gene, Rich, Virginia, Hines, Mark, Saleska, Scott R., and Li, Changsheng. Adding stable carbon isotopes improves model representation of the role of microbial communities in peatland methane cycling. United States: N. p., 2017. Web. doi:10.1002/2016MS000817.
Deng, Jia, McCalley, Carmody K., Frolking, Steve, Chanton, Jeff, Crill, Patrick, Varner, Ruth, Tyson, Gene, Rich, Virginia, Hines, Mark, Saleska, Scott R., & Li, Changsheng. Adding stable carbon isotopes improves model representation of the role of microbial communities in peatland methane cycling. United States. https://doi.org/10.1002/2016MS000817
Deng, Jia, McCalley, Carmody K., Frolking, Steve, Chanton, Jeff, Crill, Patrick, Varner, Ruth, Tyson, Gene, Rich, Virginia, Hines, Mark, Saleska, Scott R., and Li, Changsheng. 2017. "Adding stable carbon isotopes improves model representation of the role of microbial communities in peatland methane cycling". United States. https://doi.org/10.1002/2016MS000817.
@article{osti_1363819,
title = {Adding stable carbon isotopes improves model representation of the role of microbial communities in peatland methane cycling},
author = {Deng, Jia and McCalley, Carmody K. and Frolking, Steve and Chanton, Jeff and Crill, Patrick and Varner, Ruth and Tyson, Gene and Rich, Virginia and Hines, Mark and Saleska, Scott R. and Li, Changsheng},
abstractNote = {Climate change is expected to have significant and uncertain impacts on methane (CH4) emissions from northern peatlands. Biogeochemical models can extrapolate site-specific CH4 measurements to larger scales and predict responses of CH4 emissions to environmental changes. However, these models include considerable uncertainties and limitations in representing CH4 production, consumption, and transport processes. To improve predictions of CH4 transformations, we incorporated acetate and stable carbon (C) isotopic dynamics associated with CH4 cycling into a biogeochemistry model, DNDC. By including these new features, DNDC explicitly simulates acetate dynamics and the relative contribution of acetotrophic and hydrogenotrophic methanogenesis (AM and HM) to CH4 production, and predicts the C isotopic signature (δ13C) in soil C pools and emitted gases. When tested against biogeochemical and microbial community observations at two sites in a zone of thawing permafrost in a subarctic peatland in Sweden, the new formulation substantially improved agreement with CH4 production pathways and δ13C in emitted CH4 (δ13C-CH4), a measure of the integrated effects of microbial production and consumption, and of physical transport. We also investigated the sensitivity of simulated δ13C-CH4 to C isotopic composition of substrates and, to fractionation factors for CH4 production (αAM and αHM), CH4 oxidation (αMO), and plant-mediated CH4 transport (αTP). The sensitivity analysis indicated that the δ13C-CH4 is highly sensitive to the factors associated with microbial metabolism (αAM, αHM, and αMO). The model framework simulating stable C isotopic dynamics provides a robust basis for better constraining and testing microbial mechanisms in predicting CH4 cycling in peatlands.},
doi = {10.1002/2016MS000817},
url = {https://www.osti.gov/biblio/1363819}, journal = {Journal of Advances in Modeling Earth Systems},
issn = {1942-2466},
number = 2,
volume = 9,
place = {United States},
year = {Tue Jun 13 00:00:00 EDT 2017},
month = {Tue Jun 13 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at https://doi.org/10.1002/2016MS000817

Citation Metrics:
Cited by: 16 works
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Works referenced in this record:

Vulnerability of Permafrost Carbon to Climate Change: Implications for the Global Carbon Cycle
journal, September 2008


High risk of permafrost thaw
journal, November 2011


Carbon and hydrogen isotope ratio characterization of methane dynamics for Fluxnet Peatland Ecosystems
journal, June 2011


A new climate era in the sub-Arctic: Accelerating climate changes and multiple impacts: CHANGING CLIMATE IN THE SUB-ARCTIC
journal, July 2010


Estimating the near-surface permafrost-carbon feedback on global warming
journal, January 2012


Microbial processes of CH4 production in a rice paddy soil: model and experimental validation
journal, July 2001


Total hydrocarbon flux dynamics at a subarctic mire in northern Sweden
journal, January 2008


CLIMATE CHANGE: Permafrost and the Global Carbon Budget
journal, June 2006


Peatlands in the Earth’s 21st century climate system
journal, December 2011


A pan-Arctic synthesis of CH 4 and CO 2 production from anoxic soil incubations
journal, March 2015


Humic substances as electron acceptors for microbial respiration
journal, August 1996


Soil incubations reproduce field methane dynamics in a subarctic wetland
journal, October 2015


A process-oriented model of N 2 O and NO emissions from forest soils: 1. Model development
journal, February 2000


Peatlands and the carbon cycle: from local processes to global implications – a synthesis
journal, January 2008


Multi-decadal degradation and persistence of permafrost in the Alaska Highway corridor, northwest Canada
journal, October 2013


Stable carbon isotope fractionation during methanogenesis in three boreal peatland ecosystems
journal, January 2010


Incorporation of a permafrost model into a large-scale ecosystem model: Evaluation of temporal and spatial scaling issues in simulating soil thermal dynamics
journal, December 2001


Changes in peat chemistry associated with permafrost thaw increase greenhouse gas production
journal, April 2014


Sensitivity Analysis of the wepp Hillslope Profile Erosion Model
journal, January 1990


Accelerated thawing of subarctic peatland permafrost over the last 50 years
journal, January 2004


Methane production as a function of anaerobic carbon mineralization: A process model
journal, August 1998


Effect of permafrost thaw on CO 2 and CH 4 exchange in a western Alaska peatland chronosequence
journal, August 2014


Environmental and physical controls on northern terrestrial methane emissions across permafrost zones
journal, November 2012


The effect of permafrost thaw on old carbon release and net carbon exchange from tundra
journal, May 2009


Microbes in thawing permafrost: the unknown variable in the climate change equation
journal, November 2011


Carbon Isotope Ratios in Belowground Carbon Cycle Processes
journal, April 2000


Vegetation, climatic changes and net carbon sequestration in a North-Scandinavian subarctic mire over 30 years
journal, October 2005


Global peatland dynamics since the Last Glacial Maximum: GLOBAL PEATLANDS SINCE THE LGM
journal, July 2010


Modeling greenhouse gas emissions from rice-based production systems: Sensitivity and upscaling: MODELING GHGS IN RICE-BASED AGRICULTURE
journal, March 2004


Anaerobic microbial biogeochemistry in a northern bog: Acetate as a dominant metabolic end product: ANAEROBIC MICROBIAL BIOGEOCHEMISTRY IN A NORTHERN BOG
journal, October 2002


Methane emission from rice: Stable isotopes, diurnal variations, and CO 2 exchange
journal, March 1997


Partitioning pathways of CO2 production in peatlands with stable carbon isotopes
journal, December 2012


Thawing sub-arctic permafrost: Effects on vegetation and methane emissions
journal, January 2004


Modeling impacts of changes in temperature and water table on C gas fluxes in an Alaskan peatland: Modeling C Gas Fluxes in Peatland
journal, July 2015


Nutrients and Hydrology Indicate the Driving Mechanisms of Peatland Surface Patterning
journal, June 2009


Manure-DNDC: a biogeochemical process model for quantifying greenhouse gas and ammonia emissions from livestock manure systems
journal, May 2012


Decadal vegetation changes in a northern peatland, greenhouse gas fluxes and net radiative forcing
journal, December 2006


Sensitivity of the carbon cycle in the Arctic to climate change
journal, November 2009


Thawing permafrost and thicker active layers in sub-arctic Sweden
journal, July 2008


Methane emissions from wetlands: biogeochemical, microbial, and modeling perspectives from local to global scales
journal, February 2013


Annual carbon gas budget for a subarctic peatland, Northern Sweden
journal, January 2010


Reduction in areal extent of high-latitude wetlands in response to permafrost thaw
journal, June 2011


Methane dynamics regulated by microbial community response to permafrost thaw
journal, October 2014


A model of nitrous oxide evolution from soil driven by rainfall events: 1. Model structure and sensitivity
journal, June 1992


Quantifying greenhouse gas emissions from soils: Scientific basis and modeling approach
journal, August 2007


Present state of global wetland extent and wetland methane modelling: methodology of a model inter-comparison project (WETCHIMP)
journal, January 2013


Electron transfer of dissolved organic matter and its potential significance for anaerobic respiration in a northern bog
journal, August 2007


A model of nitrous oxide evolution from soil driven by rainfall events: 2. Model applications
journal, June 1992


Discovery of a novel methanogen prevalent in thawing permafrost
journal, February 2014


Permafrost-thaw-induced land-cover change in the Canadian subarctic: implications for water resources
journal, November 2010


Carbon respiration from subsurface peat accelerated by climate warming in the subarctic
journal, July 2009


Reviews and syntheses: Four decades of modeling methane cycling in terrestrial ecosystems
journal, January 2016


Soil organic carbon pools in the northern circumpolar permafrost region: SOIL ORGANIC CARBON POOLS
journal, June 2009