Evaluation of the heat pulse velocity method for measuring sap flow inPinus patula

Evaluation of the heat pulse velocity method for measuring sap flow in Pinus patula

Information on the water use of Pinus patula plantations is required to predict the impact of forest plantations on water resources in South Africa. The heat pulse velocity (HPV) method is a promising technique for measuring water use by trees, and has been shown to measure sap flows accurately in a variety of hardwood trees. This method has not been sufficiently verified for pine trees where t...

Calibra Ting the Compensa Tion Heat -pulse Technique for Measuring Sap Flow in Olive

The compensation heat-pulse method, a technique for measuring sap f10w in plants, was caJibrated for the olive tree. Two calibration experiments were carried out, the excision and the perfusion experiments. A device was designed in our laboratory for the perfusion experiment, which allowed us to calibrate the technique for a range of 0.5 L h O ' to 14 L h" '. The correction factors given by Gre...

On the heat impulse method for deducing sap flow

Evaluation of the Heat Pulse Ratio Method for Measuring Soil Water Flux

ods for measuring water flux (Hopmans et al., 2002; Mori et al., 2003; Ren et al., 2000; Wang et al., 2002). Soil water flux is an important hydrologic parameter, yet few techHeat pulse methods for measuring water flux are niques for measuring it in situ are available. Here we evaluate the based on measuring the convective transport of a heat heat pulse ratio method for measuring water flux. We...

Laboratory Evaluation of the Dual-Probe Heat-Pulse Method for Measuring Soil Water Content

to evaluate the level of accuracy and precision that can be achieved with the DPHP method. Tarara and Ham The dual-probe heat-pulse (DPHP) method provides a means of (1997) conducted a laboratory experiment in which estimating volumetric soil water content ( ) and change in volumetric water content ( ) from measurements of volumetric heat capacity. DPHP-based estimates were compared with values...