Biologia Plantarum

, Volume 50, Issue 4, pp 603–609

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

Authors

    • Institute of Botany and EcologyUniversity of Tartu
  • A. Sellin
    • Institute of Botany and EcologyUniversity of Tartu
  • Z. Klimánková
    • Institute of Landscape Ecology, AS CR
  • R. Pokorný
    • Institute of Landscape Ecology, AS CR
  • J. Puértolas
    • Centro Nacional de Mejora Forestal “El Serranillo”
Original Paper

DOI: 10.1007/s10535-006-0095-0

Cite this article as:
Kupper, P., Sellin, A., Klimánková, Z. et al. Biol Plant (2006) 50: 603. doi:10.1007/s10535-006-0095-0

Abstract

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.

Additional key words

CO2 enrichmentglobal changePicea abies (L.) Karstsap fluxshoot water potentialsoil water limitationwhole-tree hydraulic conductance

Abbreviations

CSoil

soil water content

FSA

xylem sap flux expressed by sapwood transverse area, gs-stomatal conductance

GT

soil-to-leaf hydraulic conductance

GTla

soil-to-leaf hydraulic conductance expressed by projected leaf area

GTsa

soil-to-leaf hydraulic conductance expressed by sapwood transverse area

PN

net photosynthetic rate

RWCW

relative water content of sapwood

VPD

vapour pressure deficit

ΨPd

predawn shoot water potential

ΨS

soil water potential

ΨX

daily shoot water potential

Copyright information

© Institute of Experimental Botany, ASCR, Praha 2006