Abstract
it is assumed that the heat flow between the trunk surface and the surrounding air is negligible. The method was tested : a) in the laboratory, by forcing water passage in a branch segment under stationary conditions and by comparing these known water fluxes with the estimated values; b) in the greenhouse, with small potted trees (1 - 8 cm diameter), by comparing the actual transpiration rate measured by weighing and the estimated values. The experimental results indicate that the computed sap flow rate closely follows the measured transpiration rate and the daily transpiration flow is evaluated by excess with a variable error not greater than 30%. Analysis of the results shows that this method can be improved by measuring the lateral heat flow and the heat power accumulated in the volume of trunk limited by the heating jacket An improved sap flow sensor is now being tested.
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