INFLUENCE OF VARIOUS ELECTRODES AND TISSUES ON THE ELECTRICAL IMPEDANCE OF WOODY STEMS

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Abstract
The electrical impedance was measured with a four-electrode probe on twigs of one hardwood and one conifer. The probes tested were: (1) stainless steel; (2) nickel-plated steel; (3) silver; and (4) chloridized silver. The influence of the xylem and bark (i.e., periderm, phloem, and cambium combined) on the twig impedance was determined by measuring the impedance and the electrolytic content of the two tissues. The four types of electrodes were equally effective in measuring impedance. Polarization and contact resistance were found to be minimal because impedance increased lineally with increasing distance between electrodes within the range of 1–3 cm. A combination of bark thickness and the amount of cell membranes was found to be responsible for the greater magnitude of the bark impedance as compared with the xylem impedance.

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