Measuring and modelling the transpiration of a maritime pine canopy from sap-flow data

Abstract The transpiration of a maritime pine canopy was determined from sap-flow measurements obtained from three experiments carried out at two sites in the Landes de Gascogne Forest, southwest France. From these data, the canopy stomatal conductance was estimated by inverting the Penman-Monteith equation, and a canopy conductance model which included the effects of air vapour pressure deficit, soil moisture deficit and irradiance was tested. Values of canopy transpiration simulated by the model for the three sites were compared with field data. The canopy stomatal conductance was decreasingly sensitive to air vapour pressure deficit, soil moisture deficit and global irradiance. There was better agreement between predicted and actual data for transpiration ( R 2 = 0.83–0.87) than for canopy stomatal conductance ( R 2 = 0.50–0.78). Values of daily transpiration simulated by the model were in good agreement with field data ( R 2 = 0.85–0.93).

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