Temperature responses of NO and N sub(2)O emissions from boreal organic soil

Both NO and N sub(2)O are produced in soil microbial processes and have importance in atmospheric physics and chemistry. In recent years several studies have shown that N sub(2)O emissions from organic soils can be high at low temperatures. However, the effects of low temperature on NO emissions fro...

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Bibliographic Details
Published in:Soil biology & biochemistry 2006-07, Vol.38 (7), p.1779-1787
Main Authors: Koponen, Hannu T, Duran, Claudia Escude, Maljanen, Marja, Hytoenen, Jyrki, Martikainen, Pertti J
Format: Article
Language:English
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Summary:Both NO and N sub(2)O are produced in soil microbial processes and have importance in atmospheric physics and chemistry. In recent years several studies have shown that N sub(2)O emissions from organic soils can be high at low temperatures. However, the effects of low temperature on NO emissions from soil are unknown. We studied in laboratory conditions, using undisturbed soil cores, the emissions of NO and N sub(2)O from organic soils at various temperatures, with an emphasis on processes and emissions during soil freezing and thawing periods. We found no soil freezing- or thawing-related emission maxima for NO, while the N sub(2)O emissions were higher both during soil freezing and thawing periods. The results suggest that different factors are involved in the regulation of NO and N sub(2)O emissions at low temperatures.
ISSN:0038-0717
DOI:10.1016/j.soilbio.2005.12.004