Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Water relations in Norway spruce trees growing at ambient and elevated CO2 concentrations
AU - Kupper, P
AU - Sellin, A
AU - Klimankova, Z
AU - Pokorny, R
AU - Puertolas Simon, Jaime
PY - 2006/12
Y1 - 2006/12
N2 - Water relations were studied in Norway spruce [Picea abies (L.) Karst.] trees grown at ambient (AC, 350 mu mol mol(-1)) and elevated (EC, 700 mu mol 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 (G(Tsa)) was 1.4 times higher for the upper crown than that calculated across the whole crown for the trees in AC. However, G(Tsa) 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 F-SA 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.
AB - Water relations were studied in Norway spruce [Picea abies (L.) Karst.] trees grown at ambient (AC, 350 mu mol mol(-1)) and elevated (EC, 700 mu mol 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 (G(Tsa)) was 1.4 times higher for the upper crown than that calculated across the whole crown for the trees in AC. However, G(Tsa) 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 F-SA 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.
KW - PINE
KW - TRANSPIRATION
KW - soil water limitation
KW - HYDRAULIC CONSTRAINTS
KW - sap flux
KW - ATMOSPHERIC CO2
KW - shoot water potential
KW - global change
KW - Picea abies (L.) Karst.
KW - CO2 enrichment
KW - VAPOR-PRESSURE DEFICIT
KW - whole-tree hydraulic conductance
KW - SHADE TOLERANCE
KW - STOMATAL CONDUCTANCE
KW - GAS-EXCHANGE
KW - DROUGHT
KW - FOREST STANDS
U2 - 10.1007/s10535-006-0095-0
DO - 10.1007/s10535-006-0095-0
M3 - Journal article
VL - 50
SP - 603
EP - 609
JO - Biologia Plantarum
JF - Biologia Plantarum
SN - 0006-3134
IS - 4
ER -