Sap flow as an indicator of transpiration and the water status of young apricot trees |
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Authors: | Alarcón JJ Domingo R Green SR Sánchez-Blanco MJ Rodríguez P Torrecillas A |
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Institution: | (1) Dpto. Riego y Salinidad, Centro de Edafología y Biología Aplicada del Segura (CSIC), P.O. Box 4195, E-30100 Murcia, Spain;(2) Dpto. Producción Agraria, Escuela Técnica Superior de Ingeniería Agrónomica (ETSIA), Politécnica de Cartagena (UPCT), Paseo Alfonso XIII 34, E-30203 Cartagena, Spain;(3) HortResearch Institute, Palmerston North, Private Bag 11030, New Zealand |
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Abstract: | 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.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | drought hydraulic resistance leaf water relations |
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