Abstract
The tissue heat-balance method (Cy and the heat-dissipation method (Granier) were compared in three Scots pines and two Norway spruces in a forest in central Sweden. The Granier system measured up to 50% lower sapflow than the Cy system at high flow rates. New coefficients for the Granier system were estimated, based on sapflow density from the Cy measurements. Wi- thout compensation, natural temperature gradients may cause large errors in measurements made by the Granier system. By using a hori- zontal reference sensor, no compensation was necessary. It was also shown that radial flow patterns must be considered when calculating total tree sapflow. Transpiration of two adjacent stands, one measured by the Granier method and the other by the Cy method, sho- wed good agreement internally and with total evaporation measured by the eddy-correlation method.
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