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  Winter CO2 fluxes in a boreal forest

Winston, G. C., Sundquist, E. T., Stephens, B. B., & Trumbore, S. E. (1997). Winter CO2 fluxes in a boreal forest. Journal of Geophysical Research: Atmospheres, 102(D24), 28795-28804. doi:10.1029/97JD01115.

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BEX352.pdf (Publisher version), 955KB
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Winston, G. C., Author
Sundquist, E. T., Author
Stephens, B. B., Author
Trumbore, Susan E.1, Author           
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1External Organizations, ou_persistent22              

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Free keywords: carbon-dioxide snow cover water-content soil temperature litter decomposition floor sites
 Abstract: We measured soil respiration during two winters in three different ecotypes of the BOREAS northern study area. The production of CO2 was continuous throughout the winter and, when totaled for the winter of 1993-1995, was equivalent to the release of similar to 40-55 g C/m(2) from the soil surface. As soils cooled in the early winter, the CO2 production rate decreased in a manner that appeared to be exponentially related to shallow soil temperatures. This exponential relationship was not observed when soils began to warm, possibly indicating that there may be additional or different processes responsible for increased CO2 production during winter warming events. We also measured CO2 concentrations in soil gas and the Delta(14)C of the soil CO2. These measurements show that the CO2 produced in winter is not simply the return to the atmosphere Of the carbon fixed during the previous growing season. We suggest that the wintertime production of CO2 originates, at least in part, from the decomposition of old organic carbon stored at depth in the soil.

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Language(s): eng - English
 Dates: 1997
 Publication Status: Published in print
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 Identifiers: Other: BEX352
DOI: 10.1029/97JD01115
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Title: Journal of Geophysical Research: Atmospheres
  Other : JGR-D
  Abbreviation : J. Geophys. Res. - D
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Geophysical Union
Pages: - Volume / Issue: 102 (D24) Sequence Number: - Start / End Page: 28795 - 28804 Identifier: ISSN: 0148-0227
CoNE: https://pure.mpg.de/cone/journals/resource/991042728714264_1