A model of heat transfer in sapwood and implications for sap flux density measurements using thermal dissipation probes
نویسندگان
چکیده
منابع مشابه
Estimating sap flux densities in date palm trees using the heat dissipation method and weighing lysimeters.
In a world of diminishing water reservoirs and a rising demand for food, the practice and development of water stress indicators and sensors are in rapid progress. The heat dissipation method, originally established by Granier, is herein applied and modified to enable sap flow measurements in date palm trees in the southern Arava desert of Israel. A long and tough sensor was constructed to with...
متن کاملComparison of Tissue Heat Balance- and Thermal Dissipation-Derived Sap Flow Measurements in Ring-Porous Oaks and a Pine
Sap flow measurements have become integral in many physiological and ecological investigations. A number of methods are used to estimate sap flow rates in trees, but probably the most popular is the thermal dissipation (TD) method because of its affordability, relatively low power consumption, and ease of use. However, there have been questions about the use of this method in ring-porous specie...
متن کاملInfluence of stem temperature changes on heat pulse sap flux density measurements.
While natural spatial temperature gradients between measurement needles have been thoroughly investigated for continuous heat-based sap flow methods, little attention has been given to how natural changes in stem temperature impact heat pulse-based methods through temporal rather than spatial effects. By modelling the theoretical equation for both an ideal instantaneous pulse and a step pulse a...
متن کاملHeat dissipation sensors of variable length for the measurement of sap flow in trees with deep sapwood.
Robust thermal dissipation sensors of variable length (3 to 30 cm) were developed to overcome limitations to the measurement of radial profiles of sap flow in large-diameter tropical trees with deep sapwood. The effective measuring length of the custom-made sensors was reduced to 1 cm at the tip of a thermally nonconducting shaft, thereby minimizing the influence of nonuniform sap flux density ...
متن کاملCalibration of thermal dissipation sap flow probes for ring- and diffuse-porous trees.
Thermal dissipation probes (the Granier method) are routinely used in forest ecology and water balance studies to estimate whole-tree transpiration. This method utilizes an empirically derived equation to measure sap flux density, which has been reported as independent of wood characteristics. However, errors in calculated sap flux density may occur when large gradients in sap velocity occur al...
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ژورنال
عنوان ژورنال: Tree Physiology
سال: 2011
ISSN: 0829-318X,1758-4469
DOI: 10.1093/treephys/tpr051