The Applicability of the Magnetohydrodynamic Technique to Water Flux Measurements in Forest Trees

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Abstract
Measurements are presented to show that the electrical conductivity of a tree trunk is significantly anisotropic, the axial component being greater than the radial and the radial greater than the tangential. Theoretical arguments are then given to show that this anisotropy will necessitate calibration of an electromagnetic (magnetohydrodynamic) flowmeter each time it is used to measure water flux up a tree trunk.

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