Calibration of sap flow estimated by the compensation heat pulse method in olive, plum and orange trees: relationships with xylem anatomy

Tree Physiology
José E FernándezI F Girón

Abstract

The compensation heat pulse method is widely used to estimate sap flow in conducting organs of woody plants. Being an invasive technique, calibration is crucial to derive correction factors for accurately estimating the sap flow value from the measured heat pulse velocity. We compared the results of excision and perfusion calibration experiments made with mature olive (Olea europaea L. 'Manzanilla de Sevilla'), plum (Prunus domestica L. 'Songal') and orange (Citrus sinensis (L.) Osbeck. 'Cadenero') trees. The calibration experiments were designed according to current knowledge on the application of the technique and the analysis of measured heat pulse velocities. Data on xylem characteristics were obtained from the experimental trees and related to the results of the calibration experiments. The most accurate sap flow values were obtained by assuming a wound width of 2.0 mm for olive and 2.4 mm for plum and orange. Although the three possible methods of integrating the sap velocity profiles produced similar results for all three species, the best results were obtained by calculating sap flow as the weighted sum of the product of sap velocity and the associated sapwood area across the four sensors of the heat-pulse-velocity prob...Continue Reading

Citations

Jun 7, 2011·Ecological Applications : a Publication of the Ecological Society of America·Diane E PatakiStephanie Pincetl
Feb 1, 2014·Pest Management Science·Srđan G AćimovićJohn C Wise
Jun 26, 2020·Sensors·Jucilene M SiqueiraJosé C Silvestre
Oct 22, 2019·Frontiers in Plant Science·Andrea MiserereMaria Cecilia Rousseaux

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