Journal
SOIL BIOLOGY & BIOCHEMISTRY
Volume 43, Issue 4, Pages 866-869Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2010.12.021
Keywords
Decomposition; Q(10); Soil warming; Soil microbes
Categories
Funding
- National Research Initiative of the USDA Cooperative State Research, Education and Extension Service
- U.S. Department of Energy's Office of Science through the Midwestern Regional Center of the National Institute for Climatic Change Research at Michigan Technological University
- Kearney Foundation of Soil Science
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In a 122-day incubation experiment with two soil types under four temperature treatments, we examined whether the temperature sensitivity of soil organic carbon (SOC) decomposition differed between constant and diurnally-varying soil temperature regimes. We calculated the Q(10) values after accounting for changes in substrate availability and quality among treatments over time. The Q(10) values under constant temperature regime were consistently and significantly higher than those under diurnally-varying temperature regime, particularly in the later stages of decomposition (by up to 30%). This result indicated that different temperature regime was one of the important factors causing the current controversy about the temperature sensitivity of SOC decomposition in published reports. (C) 2011 Elsevier Ltd. All rights reserved.
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