Abstract

SUMMARYField measurements using 30-month-old grevillea trees indicated that the three main sources of error in sap flow estimation can be overcome by: estimating the temperature bias with the gauge heater switched off or covering the whole trunk with 20 mm thick styrofoam sheet and alumimium foil; or by inserting thermocouples in the stem and accounting for radial and conductive heat losses. These corrections reduce gauge error for tree trunks (50–90 mm diameter) from 10–47% to ±7%. In the absence of a large lysimeter, a comparison of sap flow rates was made by attaching gauges to the trunk and a single terminal branch on the same tree.Calibrado del flujo de la savia en los árboles del género Grevillea

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