Controls on soil respiration in semiarid soils

Conant, Richard T., Dalla-Betta, Peter, Klopatek, Carole C., & Klopatek, Jeffrey M. (2004) Controls on soil respiration in semiarid soils. Soil Biology & Biochemistry, 36(6), pp. 945-951.

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Soil respiration in semiarid ecosystems responds positively to temperature, but temperature is just one of many factors controlling soil respiration. Soil moisture can have an overriding influence, particularly during the dry/warm portions of the year. The purpose of this project was to evaluate the influence of soil moisture on the relationship between temperature and soil respiration. Soil samples collected from a range of sites arrayed across a climatic gradient were incubated under varying temperature and moisture conditions. Additionally, we evaluated the impact of substrate quality on short-term soil respiration responses by carrying out substrate-induced respiration assessments for each soil at nine different temperatures. Within all soil moisture regimes, respiration rates always increased with increase in temperature. For a given temperature, soil respiration increased by half (on average) across moisture regimes; Q(10) values declined with soil moisture from 3.2 (at -0.03 MPa) to 2.1 (-1.5 MPa). In summary, soil respiration was generally directly related to temperature, but responses were ameliorated with decrease in soil moisture. (C) 2004 Elsevier Ltd. All rights reserved.

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ID Code: 37779
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: Soil respiration; Soil carbon; Litter quality; Soil moisture; Pinyon–juniper; Ponderosa pine; Desert scrub
DOI: 10.1016/j.soilbio.2004.02.013
ISSN: 0038-0717
Subjects: Australian and New Zealand Standard Research Classification > ENVIRONMENTAL SCIENCES (050000) > ECOLOGICAL APPLICATIONS (050100)
Australian and New Zealand Standard Research Classification > ENVIRONMENTAL SCIENCES (050000) > SOIL SCIENCES (050300)
Divisions: Past > Institutes > Institute for Sustainable Resources
Copyright Owner: Copyright 2004 Elsevier
Deposited On: 08 Oct 2010 02:02
Last Modified: 10 Aug 2011 15:14

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