Sustained large stimulation of soil heterotrophic respiration rate and its temperature sensitivity by soil warming in a cool-temperate forested peatland

Sustained large stimulation of soil heterotrophic respiration rate and its temperature sensitivity by soil warming in a cool-temperate forested peatland

We conducted a soil warming experiment in a cool-temperate forested peatland in northern Japan during the snow-free seasons of 2007-2011, to determine whether the soil warming would change the heterotrophic respiration rate and its temperature sensitivity. We elevated the soil temperature by 3°C at...

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Bibliographic Details
Published in:Tellus. Series B, Chemical and physical meteorology Vol. 65; no. 1; pp. 20792 - 13
Main Authors: Aguilos, Maricar, Takagi, Kentaro, Liang, Naishen, Watanabe, Yoko, Teramoto, Munemasa, Goto, Seijiro, Takahashi, Yoshiyuki, Mukai, Hitoshi, Sasa, Kaichiro
Format: Journal Article
Language:English
Published: Stockholm Taylor & Francis 01-01-2013
Ubiquity Press
Stockholm University Press
Subjects:
Atmosphere
automated-chamber
Automation
basal respiration
Carbon
Carbon dioxide
Chambers
Climate change
Decomposition
Ecosystems
Feedback
Forest soils
Forests
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Global warming
Herbivores
infrared heater
Moisture content
Peatlands
Q10
Respiration
Science
Seasons
Soil (material)
soil carbon stock
Soil temperature
Studies
Temperate forests
Temperature
Water stress
Japan
INW, Japan
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Summary:We conducted a soil warming experiment in a cool-temperate forested peatland in northern Japan during the snow-free seasons of 2007-2011, to determine whether the soil warming would change the heterotrophic respiration rate and its temperature sensitivity. We elevated the soil temperature by 3°C at 5-cm depth by using overhead infrared heaters and continuously measured hourly soil CO 2 fluxes with a 15-channel automated chamber system. The 15 chambers were divided into three groups each with five replications for the control, unwarmed-trenched and warmed-trenched treatments. Soil warming enhanced heterotrophic respiration by 82% (mean of four seasons (2008-2011) observation±SD, 6.84±2.22 µmol C m −2 s −1 ) as compared to the unwarmed-trenched treatment (3.76±0.98 µmol C m −2 s −1 ). The sustained enhancement of heterotrophic respiration with soil warming suggests that global warming will accelerate the loss of carbon substantially more from forested peatlands than from other upland forest soils. Soil warming likewise enhanced temperature sensitivity slightly (Q 10 , 3.1±0.08 and 3.3±0.06 in the four-season average in unwarmed- and warmed-trenched treatments, respectively), and significant effect was observed in 2009 (p<0.001) and 2010 (p<0.01). However, there was no significant difference in the basal respiration rate at 10°C (R 10 , 2.2±0.52 and 2.8±1.2 µmol C m −2 s −1 ) between treatments, although the values tended to be high by warming throughout the study period. These results suggest that global warming will enhance not only the heterotrophic respiration rate itself but also its Q 10 in forests with high substrate availability and without severe water stress, and predictions for such ecosystems obtained by using models assuming no change in Q 10 are likely to underestimate the carbon release from the soil to the atmosphere in a future warmer environment.
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ISSN:0280-6509
1600-0889
1600-0889
DOI:10.3402/tellusb.v65i0.20792