Dynamics of temperature normalized stem CO2 efflux in Norway Spruce stand

0366891 - ÚVGZ 2012 RIV CZ eng J - Journal Article
Dařenová, Eva - Pavelka, Marian - Janouš, Dalibor
Dynamics of temperature normalized stem CO2 efflux in Norway Spruce stand.
Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis. Roč. 59, č. 6 (2011), s. 121-125. ISSN 1211-8516. E-ISSN 2464-8310
R&D Projects: GA MŠMT(CZ) ED1.1.00/02.0073; GA MŽP(CZ) SP/2D1/70/08; GA AV ČR IAA300420803; GA MŠMT 2B06068
Institutional research plan: CEZ:AV0Z60870520
Keywords : soil CO2 efflux * R10 * Picea abies * precipitations * stem growth
Subject RIV: EH - Ecology, Behaviour

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.
Permanent Link: http://hdl.handle.net/11104/0201726