Effects of thermo-erosional disturbance on surface soil carbon and nitrogen dynamics in upland arctic tundra

Camila Pizano, Andrés F. Barón, Edward A.G. Schuur, Kathryn G. Crummer, Michelle C. Mack

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Thaw of ice-rich permafrost soils on sloping terrain can trigger erosional disturbance events that displace large volumes of soil and sediment, kill and damage plants, and initiate secondary succession. We examined how retrogressive thaw slumps (RTS), a common form of thermo-erosional disturbance in arctic tundra, affected the local loss and re-accumulation of carbon (C) and nitrogen (N) pools in organic and surface mineral soil horizons of 18 slumps within six spatially independent sites in arctic Alaska. RTS displaced 3 kg C and 0.2 kg N per m2 from the soil organic horizon but did not alter pools of C and N in the top 15 cm of the mineral horizon. Surface soil C pools re-accumulated rapidly (32± 10 g C m-2 yr-1) through the first 60 years of succession, reaching levels similar to undisturbed tundra 40-64 years after disturbance. Average N re-accumulation rates (2.2± 1.1 g N m -2 yr-1) were much higher than expected from atmospheric deposition and biological N fixation. Finally, plant community dominance shifted from graminoids to tall deciduous shrubs, which are likely to promote higher primary productivity, biomass accumulation, and rates of nutrient cycling.

Original languageEnglish (US)
Article number075006
JournalEnvironmental Research Letters
Volume9
Issue number7
DOIs
StatePublished - Jul 1 2014
Externally publishedYes

Keywords

  • arctic tundra
  • carbon and nitrogen pools
  • deciduous shrubs
  • permfrost soil
  • thermo-erosional disturbance

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Environmental Science(all)
  • Public Health, Environmental and Occupational Health

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