Soil microbial respiration in arctic soil does not acclimate to temperature

Iain P Hartley, David W Hopkins, Mark H Garnett, Martin Sommerkorn, Philip A Wookey

Research output: Contribution to journalArticleResearchpeer-review

120 Citations (Scopus)

Abstract

Warming-induced release of CO2 from the large carbon (C) stores in arctic soils could accelerate climate change. However, declines in the response of soil respiration to warming in long-term experiments suggest that microbial activity acclimates to temperature, greatly reducing the potential for enhanced C losses. As reduced respiration rates with time could be equally caused by substrate depletion, evidence for thermal acclimation remains controversial. To overcome this problem, we carried out a cooling experiment with soils from arctic Sweden. If acclimation causes the reduction in soil respiration observed after experimental warming, then it should subsequently lead to an increase in respiration rates after cooling. We demonstrate that thermal acclimation did not occur following cooling. Rather, during the 90 days after cooling, a further reduction in the soil respiration rate was observed, which was only reversed by extended re-exposure to warmer temperatures. We conclude that over the time scale of a few weeks to months, warming-induced changes in the microbial community in arctic soils will amplify the instantaneous increase in the rates of CO2 production and thus enhance C losses potentially accelerating the rate of 21st century climate change.

Original languageEnglish
Pages (from-to)1092-100
Number of pages9
JournalEcology Letters
Volume11
Issue number10
DOIs
Publication statusPrint publication - Oct 2008
Externally publishedYes

Fingerprint

Arctic region
respiration
soil respiration
cooling
acclimation
warming
soil
temperature
climate change
heat
long term experiments
microbial activity
microbial communities
twenty first century
Sweden
microbial community
rate
carbon
timescale
substrate

Keywords

  • Acclimatization/physiology
  • Analysis of Variance
  • Arctic Regions
  • Bacteria/metabolism
  • Carbon/metabolism
  • Carbon Dioxide/metabolism
  • Ecosystem
  • Fungi/metabolism
  • Seasons
  • Soil/analysis
  • Soil Microbiology
  • Sweden
  • Temperature
  • Time Factors

Cite this

Hartley, Iain P ; Hopkins, David W ; Garnett, Mark H ; Sommerkorn, Martin ; Wookey, Philip A. / Soil microbial respiration in arctic soil does not acclimate to temperature. In: Ecology Letters. 2008 ; Vol. 11, No. 10. pp. 1092-100.
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abstract = "Warming-induced release of CO2 from the large carbon (C) stores in arctic soils could accelerate climate change. However, declines in the response of soil respiration to warming in long-term experiments suggest that microbial activity acclimates to temperature, greatly reducing the potential for enhanced C losses. As reduced respiration rates with time could be equally caused by substrate depletion, evidence for thermal acclimation remains controversial. To overcome this problem, we carried out a cooling experiment with soils from arctic Sweden. If acclimation causes the reduction in soil respiration observed after experimental warming, then it should subsequently lead to an increase in respiration rates after cooling. We demonstrate that thermal acclimation did not occur following cooling. Rather, during the 90 days after cooling, a further reduction in the soil respiration rate was observed, which was only reversed by extended re-exposure to warmer temperatures. We conclude that over the time scale of a few weeks to months, warming-induced changes in the microbial community in arctic soils will amplify the instantaneous increase in the rates of CO2 production and thus enhance C losses potentially accelerating the rate of 21st century climate change.",
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Soil microbial respiration in arctic soil does not acclimate to temperature. / Hartley, Iain P; Hopkins, David W; Garnett, Mark H; Sommerkorn, Martin; Wookey, Philip A.

In: Ecology Letters, Vol. 11, No. 10, 10.2008, p. 1092-100.

Research output: Contribution to journalArticleResearchpeer-review

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N2 - Warming-induced release of CO2 from the large carbon (C) stores in arctic soils could accelerate climate change. However, declines in the response of soil respiration to warming in long-term experiments suggest that microbial activity acclimates to temperature, greatly reducing the potential for enhanced C losses. As reduced respiration rates with time could be equally caused by substrate depletion, evidence for thermal acclimation remains controversial. To overcome this problem, we carried out a cooling experiment with soils from arctic Sweden. If acclimation causes the reduction in soil respiration observed after experimental warming, then it should subsequently lead to an increase in respiration rates after cooling. We demonstrate that thermal acclimation did not occur following cooling. Rather, during the 90 days after cooling, a further reduction in the soil respiration rate was observed, which was only reversed by extended re-exposure to warmer temperatures. We conclude that over the time scale of a few weeks to months, warming-induced changes in the microbial community in arctic soils will amplify the instantaneous increase in the rates of CO2 production and thus enhance C losses potentially accelerating the rate of 21st century climate change.

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