Inactive xylem can explain differences in calibration factors for thermal dissipation probe sap flow measurements

Thermal dissipation probes (TDPs) were calibrated in three diffuse porous fruit trees and one ornamental species in the field by comparison with heat pulse probes (nectarine and persimmon), in a greenhouse on lysimeters (apple and persimmon) and in the laboratory by pushing water through cut branche...

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Bibliographic Details
Published in:Tree physiology 2013-09, Vol.33 (9), p.986-1001
Main Authors: Paudel, Indira, Kanety, Tal, Cohen, Shabtai
Format: Article
Language:English
Subjects:
Calibration
Diospyros - physiology
Laboratories
Malus - physiology
Plant Exudates - physiology
Temperature
Xylem - physiology
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Summary:Thermal dissipation probes (TDPs) were calibrated in three diffuse porous fruit trees and one ornamental species in the field by comparison with heat pulse probes (nectarine and persimmon), in a greenhouse on lysimeters (apple and persimmon) and in the laboratory by pushing water through cut branches (apple, Peltophorum and nectarine). Two operational methods were used: continuous (constant thermal dissipation, CTD) and discontinuous, or transient, heating (transient thermal dissipation, TTD). Correction for the radial distribution of sap flux density was with an analytical function derived from a linear decrease in flux density with depth, as measured with a multi-depth 'Tmax' heat pulse system. When analyzed with previous calibration factors, the measured sap flow was
ISSN:0829-318X
1758-4469
DOI:10.1093/treephys/tpt070