biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 50:603-609, 2006 | DOI: 10.1007/s10535-006-0095-0

Water relations in Norway spruce trees growing at ambient and elevated CO2 concentrations

P. Kupper1,*, A. Sellin1, Z. Klimánková2, R. Pokorný2, J. Puértolas3
1 Institute of Botany and Ecology, University of Tartu, Tartu, Estonia
2 Institute of Landscape Ecology, AS CR, Brno, Czech Republic
3 Centro Nacional de Mejora Forestal "El Serranillo", Guadalajara, Spain

Water relations were studied in Norway spruce [Picea abies (L.) Karst.] trees grown at ambient (AC, 350 μmol mol-1) and elevated (EC, 700 μmol mol-1) CO2 concentrations under temperate water stress. The results suggested that both crown position and variability in atmospheric CO2 concentration are responsible for different patterns of crown water relations. Mean hourly sap flux density (FSA) showed higher values in upper crown position in comparison with the whole crown in both AC and EC treatments. Mean soil-to-leaf hydraulic conductance (GTsa) was 1.4 times higher for the upper crown than that calculated across the whole crown for the trees in AC. However, GTsa did not vary significantly with crown position in EC trees, suggesting that elevated CO2 may mitigate differences in hydraulic supply for different canopy layers. The trees in EC treatment exhibited significantly higher values of FSA measured on the whole crown level and slightly higher soil water content compared to AC treatment, suggesting more economical use of soil water and therefore an advantage under water-limited conditions.

Keywords: CO2 enrichment; global change; Picea abies (L.) Karst; sap flux; shoot water potential; soil water limitation; whole-tree hydraulic conductance
Subjects: CO2 concentration, elevated, enrichment; gas exchange; hydraulic conductance; Norway spruce; Picea abies; potentials, osmotic, water; relative water content (RWC); sap flux; stomatal conductance; water stress

Received: December 7, 2004; Accepted: May 24, 2005; Published: December 1, 2006  Show citation

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Kupper, P., Sellin, A., Klimánková, Z., Pokorný, R., & Puértolas, J. (2006). Water relations in Norway spruce trees growing at ambient and elevated CO2 concentrations. Biologia plantarum, 50(4), 603-609. doi: 10.1007/s10535-006-0095-0
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