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DAŘENOVA, E., PAVELKA, M., JANOUS, D.: Dynamics of temperature normalized stem CO 2 effl ux in Norway spruce stand. Acta univ. agric. et silvic. Mendel. Brun., 2011, LIX, No. 6, pp. 121–126 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 fl ux estimates. The aim of this study was to determine dynamics of stem CO 2 effl ux during the growing season in Norway spruce stand and factors aff ecting this effl ux. Continuous measurements of stem CO 2 effl ux 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 CO 2 effl ux was in tight relationship with changes in temperature with the mean coeffi cient of determination of 0.76. This infers that temperature was the main factor driving changes in CO 2 effl ux during the season. To eliminate eff ect of temperature and determine other factors infl uencing stem CO 2 effl ux, CO 2 effl ux was normalized for temperature of 10 °C (R 10 ). Basic seasonal course of R 10 followed the pattern of stem growth rate with its maxima in June and July. The other factor eff ect, which was possible to determine, was presence of rainfall. Rainfall strong enough caused mostly increase in R 10 . This eff ect was the most signifi cant when the R 10 course had a decreasing trend in the second part of the growing season.

Dynamics of temperature normalized stem CO<sub>2</sub> efflux in Norway spruce stand