The relationship between water loss via transpiration and stem sap flow in young apricot trees was studied under
different environmental conditions and different levels of soil water status. The experiment was carried out in a
greenhouse over a 2-week period (November 2–14, 1997) using three-year-old apricot trees (Prunus armeniaca
cv. Búlida) growing in pots. Diurnal courses of leaf water potential, leaf conductance and leaf turgor potential also
were recorded throughout the experiment. Data from four days of different enviromental conditions and soil water
availability have been selected for analysis. On each of the selected days the leaf water potential and the mean
transpiration rates were well correlated. The slope of the linear regression of this correlation, taken to indicate the
total hydraulic resistance of the tree, confirmed an increasing hydraulic resistance under drought conditions. When
the trees were not drought stressed the diurnal courses of sap flow and transpiration were very similar. However,
when the trees were droughted, measured of sap flow slightly underestimated actual transpiration. Our heat-pulse
measurements suggest the amount of readily available water stored in the stem and leaf tissues of young apricot
trees is sufficient to sustain the peak transpiration rates for about 1 hour.
The relationship between water loss via transpiration and stem sap flow in young apricot trees was studied underdifferent environmental conditions and different levels of soil water status. The experiment was carried out in agreenhouse over a 2-week period (November 2–14, 1997) using three-year-old apricot trees (Prunus armeniacacv. Búlida) growing in pots. Diurnal courses of leaf water potential, leaf conductance and leaf turgor potential alsowere recorded throughout the experiment. Data from four days of different enviromental conditions and soil wateravailability have been selected for analysis. On each of the selected days the leaf water potential and the meantranspiration rates were well correlated. The slope of the linear regression of this correlation, taken to indicate thetotal hydraulic resistance of the tree, confirmed an increasing hydraulic resistance under drought conditions. Whenthe trees were not drought stressed the diurnal courses of sap flow and transpiration were very similar. However,when the trees were droughted, measured of sap flow slightly underestimated actual transpiration. Our heat-pulsemeasurements suggest the amount of readily available water stored in the stem and leaf tissues of young apricottrees is sufficient to sustain the peak transpiration rates for about 1 hour.
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