Stem respiration of Norway spruce trees under elevated CO2 concentration |
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| Authors: | M. Acosta R. Pokorny D. Janou? M. V. Marek |
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| Affiliation: | (1) Kyushu Research Center, Forestry and Forest Products Research Institute, 4-11-16 Kurokami, Kumamoto 860-0862, Japan;(2) Hokkaido Research Center, Forestry and Forest Products Research Institute, 7 Hitsujigaoka, Toyohira Sapporo, 062-8516, Japan;(3) Department of Plant Ecology, Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba 305-8687, Japan |
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| Abstract: | Measurements of stem respiration were conducted for a period of four years (1999–2002) in 14-year old Norway spruce (Picea abies [L.] Karst) trees exposed to ambient (CA) and elevated CO2 concentration (CE; ambient plus 350 μmol mol−1). 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 °C (R10) in CA and CE treatments ranged between 1.67–1.95 and 2.19–2.72 μmol(CO2) m−2 s−1, respectively. Seasonal variations in stem respiration were related to temperature and tree growth. |
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