Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(6), 121-126 | DOI: 10.11118/actaun201159060121

Dynamics of temperature normalized stem CO2 efflux in Norway spruce stand

Eva Dařenová1, M. Pavelka, D. Janouš
1 CzechGlobe - Centrum pro studium dopadů globální změny klimatu, AV ČR v. v. i., Bělidla 4a, 603 00 Brno, Česká republika

Respiration of stems contributes approximately 8 to 13 % to the total respiration of forest ecosystem, which is not negligible, and it has to be included in carbon flux estimates. The aim of this study was to determine dynamics of stem CO2 efflux during the growing season in Norway spruce stand and factors affecting this efflux. Continuous measurements of stem CO2 efflux were carried out by an automated system during the growing season in 2006-2009. Further measured characteristics were stem temperature, stem increment and precipitations. Stem CO2 efflux was in tight relationship with changes in temperature with the mean coefficient of determination of 0.76. This infers that temperature was the main factor driving changes in CO2 efflux during the season. To eliminate effect of temperature and determine other factors influencing stem CO2 efflux, CO2 efflux was normalized for temperature of 10 °C (R10). Basic seasonal course of R10 followed the pattern of stem growth rate with its maxima in June and July. The other factor effect, which was possible to determine, was presence of rainfall. Rainfall strong enough caused mostly increase in R10. This effect was the most significant when the R10 course had a decreasing trend in the second part of the growing season.

Keywords: soil CO2 efflux, R10, Picea abies, precipitations, stem growth
Grants and funding:

This study is an output of the CzechGlobe Centre that is being developed within the OP RDI and cofinanced from EU funds and the State Budget of the Czech Republic (Project: CzechGlobe - Centre for Global Climate Change Impacts Studies, Reg. No. CZ.1.05/1.1.00/02.0073), and the study was supported by grants 2B06068 (Interviron), SP/2d1/70/08 (Forchange) and IAA300420803.

Received: October 26, 2010; Published: March 16, 2014  Show citation

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Dařenová, E., Pavelka, M., & Janouš, D. (2011). Dynamics of temperature normalized stem CO2 efflux in Norway spruce stand. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 59(6), 121-126. doi: 10.11118/actaun201159060121
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