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• W2004459852 abstract "The compensation heat-pulse method (CHPM) for measuring sap velocity in tree stems shows a poor performance for low velocities. Here we present a new procedure, that extends the validity of the technique down to zero and even for small negative values of the corrected heat-pulse velocity vc. A simulation model of heat transport for the sensor inserted in the tree showed that vc is linearly related to the average temperature difference (ΔTa) between the 2 needles from negative vc up to 30 cm h−1. The relation was confirmed for olives and pistachio trees in the field with no apparent variation for very long periods (months). The procedure, named “calibrated average gradient” (CAG), consists in averaging the ΔTa measurements after the pulse, then obtaining empirically the function vc=f(ΔTa) in its linear domain, when vc is still measurable with the traditional CHPM. The calibrated function can then be used to calculate vc below the minimum velocity measurable by the CHPM as determined by the measuring system resolution. The vc=f(ΔTa) function is sensor-specific and depends only on sensor characteristics and thermal properties; its empirical fit allows not only estimating vc for low transpiration conditions, but may also serve to check possible variations in sensor performance or changes in thermal properties of xylem tissue caused by wounding, advocating the need to re-install sensors in a new position." @default.
• W2004459852 created "2016-06-24" @default.
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• W2004459852 date "2009-03-01" @default.
• W2004459852 modified "2023-09-23" @default.
• W2004459852 title "New approach for measuring low sap velocities in trees" @default.
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• W2004459852 doi "https://doi.org/10.1016/j.agrformet.2008.10.015" @default.
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