biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 43:41-46, 2000 | DOI: 10.1023/A:1026594711628

Long-Term Effects of Elevated CO2 on Woody Tissues Respiration of Norway Spruce Studied in Open-Top Chambers

D. Janouš1, R. Pokorný1, J. Brossaud1, M.V. Marek1
1 Laboratory of Ecological Physiology of Forest Trees, Institute of Landscape Ecology, Academy of Sciences of the Czech Republic, Brno, Czech Republic e-mail

In an open-top chamber experiment located in a mountain stand of 14-years-old Norway spruce (Picea abies [L.] Karst.), trees were continuously exposed to either ambient CO2 concentration (A), or ambient + 350 µmol mol-1 (E) over four growing seasons. Respiration rates of different woody parts (stem, branches, coarse roots) were measured during the last growing season. The calculated increase in the respiration rate related to a 10 °C temperature change (Q10) was different in stem compared to branches and roots. Differences between the E and A variants were statistically significant only for roots in the autumn. Stem maintenance respiration (RMs) measured in April and November (periods of no growth activity) were not different. The stem respiration values (Rs) were recalculated to a standard temperature of 15 °C to estimate the seasonal course. The obtained Rs differed significantly between used variants during July and August. At the end of the season, Rs in E decreased slower than in A, indicating some prolongation of the physiological activity under the elevated CO2 concentration. The total stem respiration carbon losses for the investigated growing season (May - September) were higher for A (2.32 kg(C) m-2 season-1) compared to E (2.12 kg(C) m-2 season-1). The respiration rates of the whorl branches (Rb) were lower compared with the stem respiration but not significantly different between the used variants. The root respiration rate was increased in E variant.

Keywords: elevated CO2 effects; Picea abies; Q10
Subjects: elevated CO2, long-term effects on respiration; maintenance respiration, elevated CO2; Norway spruce, respiration; open-top chamber, respiration; Picea abies; respiration, elevated CO2; spruce, respiration; temperature, respiration, elevated CO2

Published: March 1, 2000  Show citation

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Janouš, D., Pokorný, R., Brossaud, J., & Marek, M.V. (2000). Long-Term Effects of Elevated CO2 on Woody Tissues Respiration of Norway Spruce Studied in Open-Top Chambers. Biologia plantarum, 43(1), 41-46. doi: 10.1023/A:1026594711628
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