Forest soil carbon oxidation state and oxidative ratio responses to elevated CO2

Hockaday, William C.; Gallagher, Morgan E.; Masiello, Caroline A.; Baldock, Jeffrey A.; Iversen, Colleen M.; Norby, Richard J.

doi:10.1002/2015JG003010

Title: Forest soil carbon oxidation state and oxidative ratio responses to elevated CO₂

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Abstract

The oxidative ratio (OR) of the biosphere is the stoichiometric ratio (O₂/CO₂) of gas exchange by photosynthesis and respiration a key parameter in budgeting calculations of the land and ocean carbon sinks. Carbon cycle-climate feedbacks could alter the OR of the biosphere by affecting the quantity and quality of organic matter in plant biomass and soil carbon pools. Here, this study considers the effect of elevated atmospheric carbon dioxide concentrations ([CO₂]) on the OR of a hardwood forest after nine growing seasons of Free-Air CO₂ Enrichment. We measured changes in the carbon oxidation state (C_ox) of biomass and soil carbon pools as a proxy for the ecosystem OR. The OR of net primary production, 1.039, was not affected by elevated [CO₂]. However, the C_ox of the soil carbon pool was 40% higher at elevated [CO₂], and the estimated OR values for soil respiration increased from 1.006 at ambient [CO₂] to 1.054 at elevated [CO₂]. A biochemical inventory of the soil organic matter ascribed the increases in C_ox and OR to faster turnover of reduced substrates, lignin and lipids, at elevated [CO₂]. This implicates the heterotrophic soil community response to elevated [CO₂] as a driver of disequilibrium in the ecosystem OR.more »« less

Authors:

Hockaday, William C. ^[1]; Gallagher, Morgan E. ^[2]; Masiello, Caroline A. ^[2]; Baldock, Jeffrey A. ^[3]; Iversen, Colleen M. ^[4]; Norby, Richard J. ^[4]

Baylor Univ., Waco, TX (United States). Dept. of Geology
Rice Univ., Houston, TX (United States). Dept. of Earth Science
CSIRO Land and Water, Glen Osmond SA (Australia)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Climate Change Science Inst. and Environmental Sciences Division

Publication Date:: Mon Sep 21 00:00:00 EDT 2015

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge National Environmental Research Park

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

OSTI Identifier:: 1328279

Grant/Contract Number:: AC05-00OR22725; DEB 0445282; DEB 0614524; EAR 1132124

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Geophysical Research. Biogeosciences

Additional Journal Information:: Journal Volume: 120; Journal Issue: 9; Journal ID: ISSN 2169-8953

Publisher:: American Geophysical Union

Country of Publication:: United States

Language:: English

Subject:: 54 ENVIRONMENTAL SCIENCES; carbon cycle; carbon oxidation state; oxidative ratio; respiratory quotient; elevated carbon dioxide; soil organic matter

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                    Hockaday, William C., Gallagher, Morgan E., Masiello, Caroline A., Baldock, Jeffrey A., Iversen, Colleen M., and Norby, Richard J. Forest soil carbon oxidation state and oxidative ratio responses to elevated CO2.  United States: N. p., 2015. 
Web.  doi:10.1002/2015JG003010.

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                    Hockaday, William C., Gallagher, Morgan E., Masiello, Caroline A., Baldock, Jeffrey A., Iversen, Colleen M., & Norby, Richard J. Forest soil carbon oxidation state and oxidative ratio responses to elevated CO2.  United States.  https://doi.org/10.1002/2015JG003010

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                    Hockaday, William C., Gallagher, Morgan E., Masiello, Caroline A., Baldock, Jeffrey A., Iversen, Colleen M., and Norby, Richard J. Mon .  
"Forest soil carbon oxidation state and oxidative ratio responses to elevated CO2".  United States.  https://doi.org/10.1002/2015JG003010.  https://www.osti.gov/servlets/purl/1328279.

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@article{osti_1328279,

  title        = {Forest soil carbon oxidation state and oxidative ratio responses to elevated CO2},

  author       = {Hockaday, William C. and Gallagher, Morgan E. and Masiello, Caroline A. and Baldock, Jeffrey A. and Iversen, Colleen M. and Norby, Richard J.},

  abstractNote = {The oxidative ratio (OR) of the biosphere is the stoichiometric ratio (O2/CO2) of gas exchange by photosynthesis and respiration a key parameter in budgeting calculations of the land and ocean carbon sinks. Carbon cycle-climate feedbacks could alter the OR of the biosphere by affecting the quantity and quality of organic matter in plant biomass and soil carbon pools. Here, this study considers the effect of elevated atmospheric carbon dioxide concentrations ([CO2]) on the OR of a hardwood forest after nine growing seasons of Free-Air CO2 Enrichment. We measured changes in the carbon oxidation state (Cox) of biomass and soil carbon pools as a proxy for the ecosystem OR. The OR of net primary production, 1.039, was not affected by elevated [CO2]. However, the Cox of the soil carbon pool was 40% higher at elevated [CO2], and the estimated OR values for soil respiration increased from 1.006 at ambient [CO2] to 1.054 at elevated [CO2]. A biochemical inventory of the soil organic matter ascribed the increases in Cox and OR to faster turnover of reduced substrates, lignin and lipids, at elevated [CO2]. This implicates the heterotrophic soil community response to elevated [CO2] as a driver of disequilibrium in the ecosystem OR. The oxidation of soil carbon pool constitutes an unexpected terrestrial O2 sink. Carbon budgets constructed under the assumption of OR equilibrium would equate such a terrestrial O2 sink to CO2 uptake by the ocean. We find that the potential for climate-driven disequilibriua in the cycling of O2 and CO2 warrants further investigation.},

  doi          = {10.1002/2015JG003010},

  journal      = {Journal of Geophysical Research. Biogeosciences},

  number       = 9,

  volume       = 120,

  place        = {United States},

  year         = {Mon Sep 21 00:00:00 EDT 2015},

  month        = {Mon Sep 21 00:00:00 EDT 2015}

}

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Title: Forest soil carbon oxidation state and oxidative ratio responses to elevated CO2

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Title: Forest soil carbon oxidation state and oxidative ratio responses to elevated CO₂