Abstract
Continuous long-term measurements of the spruce ( Picea abies) sap stream velocity and meteorological phenomena observed in the Šumava region, Czechoslovakia, indicate two different relationships between sap stream velocity as a dependent variable and meteorological factors as independent variables. For mean daily temperatures above 6°C the net radiation has been found to be the most decisive factor, while for the temperatures below 6°C, the duration of rainfall during each particular day has been found to be most significant. Comparative results for the poplar tree ( Populus tremula) are provided. The results serve as a transpiration variability indicator for the water balance calculation.
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