Global change could amplify fire effects on soil greenhouse gas emissions

Audrey Niboyet, Jamie R. Brown, Paul Dijkstra, Joseph C. Blankinship, Paul W. Leadley, Xavier Roux, Laure Barthes, Romain L. Barnard, Christopher B. Field, Bruce A Hungate

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Background: Little is known about the combined impacts of global environmental changes and ecological disturbances on ecosystem functioning, even though such combined impacts might play critical roles in shaping ecosystem processes that can in turn feed back to climate change, such as soil emissions of greenhouse gases. Methodology/Principal Findings: We took advantage of an accidental, low-severity wildfire that burned part of a long-term global change experiment to investigate the interactive effects of a fire disturbance and increases in CO2 concentration, precipitation and nitrogen supply on soil nitrous oxide (N2O) emissions in a grassland ecosystem. We examined the responses of soil N2O emissions, as well as the responses of the two main microbial processes contributing to soil N2O production - nitrification and denitrification - and of their main drivers. We show that the fire disturbance greatly increased soil N2O emissions over a three-year period, and that elevated CO2 and enhanced nitrogen supply amplified fire effects on soil N2O emissions: emissions increased by a factor of two with fire alone and by a factor of six under the combined influence of fire, elevated CO2 and nitrogen. We also provide evidence that this response was caused by increased microbial denitrification, resulting from increased soil moisture and soil carbon and nitrogen availability in the burned and fertilized plots. Conclusions/Significance: Our results indicate that the combined effects of fire and global environmental changes can exceed their effects in isolation, thereby creating unexpected feedbacks to soil greenhouse gas emissions. These findings highlight the need to further explore the impacts of ecological disturbances on ecosystem functioning in the context of global change if we wish to be able to model future soil greenhouse gas emissions with greater confidence.

Original languageEnglish (US)
Article numbere20105
JournalPLoS One
Volume6
Issue number6
DOIs
StatePublished - 2011

Fingerprint

greenhouse gas emissions
global change
Gas emissions
Greenhouse gases
Fires
Soil
Gases
nitrous oxide
Soils
soil
Ecosystems
Ecosystem
Nitrogen
Denitrification
ecosystems
nitrogen
denitrification
Feedback
Nitrification
Soil moisture

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Medicine(all)

Cite this

Global change could amplify fire effects on soil greenhouse gas emissions. / Niboyet, Audrey; Brown, Jamie R.; Dijkstra, Paul; Blankinship, Joseph C.; Leadley, Paul W.; Roux, Xavier; Barthes, Laure; Barnard, Romain L.; Field, Christopher B.; Hungate, Bruce A.

In: PLoS One, Vol. 6, No. 6, e20105, 2011.

Research output: Contribution to journalArticle

Niboyet, A, Brown, JR, Dijkstra, P, Blankinship, JC, Leadley, PW, Roux, X, Barthes, L, Barnard, RL, Field, CB & Hungate, BA 2011, 'Global change could amplify fire effects on soil greenhouse gas emissions', PLoS One, vol. 6, no. 6, e20105. https://doi.org/10.1371/journal.pone.0020105
Niboyet, Audrey ; Brown, Jamie R. ; Dijkstra, Paul ; Blankinship, Joseph C. ; Leadley, Paul W. ; Roux, Xavier ; Barthes, Laure ; Barnard, Romain L. ; Field, Christopher B. ; Hungate, Bruce A. / Global change could amplify fire effects on soil greenhouse gas emissions. In: PLoS One. 2011 ; Vol. 6, No. 6.
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