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Daily heterotrophic respiration model considering the diurnal temperature variability in the soil

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dc.contributor.author Chen, J. A.
dc.contributor.author Huang, S. E.
dc.contributor.author Ju, W.
dc.contributor.author Gaumont-Guay, David
dc.contributor.author Black, T. Andrew
dc.date.accessioned 2011-05-25T17:14:54Z
dc.date.available 2011-05-25T17:14:54Z
dc.date.issued 2009-03
dc.identifier.citation Chen, JM; Huang, SE; Ju, W; Gaumont-Guay, D; Black, T. Andrew. 2009. Daily heterotrophic respiration model considering the diurnal temperature variability in the soil. Journal of Geophysical Research Biogeosciences 114 G01022 dx.doi.org/10.1029/2008JG000834 en
dc.identifier.uri http://hdl.handle.net/2429/34813
dc.description.abstract In daily, monthly, and annual respiration models for regional and global applications, the diurnal variation of temperature is generally ignored. As the effect of temperature on respiration is nonlinear, this ignorance may cause considerable errors in respiration estimation, but these errors have not yet been systematically investigated. This is in fact a central issue in temporal scaling of ecosystem models which are often applied in time steps equal to or larger than a day. In this study, we develop an integrated daily heterotrophic respiration model, and demonstrate first theoretically the importance of considering the diurnal amplitude of soil temperature and the vertical soil carbon distribution pattern in daily respiration estimation using the daily mean temperature. Measurements of soil respiration with roots exclusion made in a mature black spruce site in Saskatchewan, Canada, in July–September 2004 are used to validate the model. Daily heterotrophic respiration rates were underestimated by up to 15%, with a mean value of 4.5%, when only the mean daily temperature was used. This underestimation occurred under the conditions that the diurnal temperature amplitude in the forest was less than 12°C and the vertical distribution of organic carbon in the top 15–30 cm was uniform. Based on the integrated daily model, this underestimation at the same site would be 38% if the amplitude increases to 20°C, and in soils with steep vertical carbon distributions with a 20°C diurnal amplitude, it can increase to 44%. The magnitude of this underestimation is theoretically proportional to [ln(Q 10)]2. During the experimental period, the value of Q 10 for heterotrophic respiration was found to be 4.0–4.5. If Q 10 = 2.0, this underestimation is reduced to about 10% at a diurnal temperature amplitude of 20°C. An edited version of this paper was published by AGU. Copyright 2009 American Geophysical Union. en
dc.language.iso eng en
dc.publisher American Geophysical Union en
dc.relation.ispartof Atmospheric Science Program en
dc.title Daily heterotrophic respiration model considering the diurnal temperature variability in the soil en
dc.type Text en
dc.type.text Article en
dc.description.affiliation Land and Food Systems, Faculty of en
dc.description.reviewstatus Reviewed en
dc.rights.copyright Black, T. Andrew
dc.description.scholarlevel Faculty en

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