Low evapotranspiration enhances the resilience of peatland carbon stocks to fire

Nicholas Kettridge, Maxwell Curtis Lukenbach, Kelly Jean Hokanson, Chris Hopkinson, Kevin J. Devito, Richard Michael Petrone, Carl Mendoza, James Michael Waddington

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)
195 Downloads (Pure)

Abstract

Boreal peatlands may be vulnerable to projected changes in the wildfire regime under future climates. Extreme drying during the sensitive post-fire period may exceed peatland ecohydrological resilience, triggering long-term degradation of these globally significant carbon stocks. Despite these concerns, we show low peatland evapotranspiration at both the plot and landscape scale post-fire, in water-limited peatlands dominated by feather moss that are ubiquitous across continental western Canada. Low post-fire evapotranspiration enhance the resilience of carbon stocks in such peatlands to wildfire disturbance and reinforces their function as a regional source or water. Near-surface water repellency may provide an important, previously unexplored, regulator of peatland evapotranspiration that can induce low evapotranspiration in the initial post-fire years by restricting the supply of water to the peat surface.
Original languageEnglish
Pages (from-to)9341-9349
JournalGeophysical Research Letters
Volume44
Issue number18
Early online date8 Sep 2017
DOIs
Publication statusPublished - 28 Sep 2017

Keywords

  • peatland
  • wildfire
  • evapatranspiration
  • resilience
  • temperature
  • water repellency
  • hydrophobicity

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