Abstract
A new concept of a heat pulse technique for the measurement of sap flow in plants is presented. It is based on using a single sensor, rather than the multiprobe arrangements, as used up to now. The single probe serves both as a heat source, and subsequently, as a sensor of the temperature transient decay. Some advantages of the new approach over present heat pulse techniques are emphasized, based on theoretical simulations of heat transfer within a plant. Several precautions to be considered when a heat pulse technique is applied for the measurement of total transpiration, are also discussed. The paper describes the theoretical basis of the method, followed by a sensitivity analysis that evaluates the effect of error in thermal conductivity on the theoretical error in the measured sap flow. A more rigorous error analysis will be performed as an integral part of an actual design of the measurement system, based on the described concept. Such a design is planned to be completed in the near future.
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