Soil microbial respiration in arctic soil does not acclimate to temperature

Hartley, I.P., Hopkins, D.W., Garnett, M.H., Sommerkorn, M. and Wookey, P.A. (2008) Soil microbial respiration in arctic soil does not acclimate to temperature. Ecology Letters, 11(10), pp. 1092-1100. (doi: 10.1111/j.1461-0248.2008.01223.x)

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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.

Item Type:Articles
Keywords:acclimation, adaptation, arctic, carbon cycling, climate change, CO2, microbial community, respiration, soil, temperature
Glasgow Author(s) Enlighten ID:Garnett, Dr Mark
Authors: Hartley, I.P., Hopkins, D.W., Garnett, M.H., Sommerkorn, M., and Wookey, P.A.
Subjects:G Geography. Anthropology. Recreation > GE Environmental Sciences
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Ecology Letters
Copyright Holders:Copyright © 2008 Blackwell Publishing
First Published:First published in Ecology Letters 11(10) :1092-1100
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher
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