Stem respiration of Norway spruce trees under elevated CO2 concentration
Acosta, M.,Akademie Ved, Brno (Czech Republic). Ustav Systemove Biologie a Ekologie | Pokorny, R.,Akademie Ved, Brno (Czech Republic). Ustav Systemove Biologie a Ekologie | Janous, D.,Akademie Ved, Brno (Czech Republic). Ustav Systemove Biologie a Ekologie | Marek, M.V.,Akademie Ved, Brno (Czech Republic). Ustav Systemove Biologie a Ekologie
Measurements of stem respiration were conducted for a period of four years (1999-2002) in 14-year old Picea abies trees exposed to ambient (CA) and elevated CO2 concentration (CE; ambient plus 350 micromol/mol). Stem respiration measurements of six trees per treatment were carried out 2-3 times per month during the growing season. Stem respiration in CE treatment was higher (up to 16 %) than in CA treatment. Temperature response of stem respiration (Q10) for the whole experimental period ranged between 1.65-2.57 in CA treatment and 2.24-2.56 in CE treatment. The mean stem respiration rate normalized to 10 deg C (R10) in CA and CE treatments ranged between 1.67-1.95 and 2.19-2.72 micromol(CO2)/square m/s, respectively. Seasonal variations in stem respiration were related to temperature and tree growth.
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