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A Study on the Longitudinal Permeability in Hornbeam Wood (Carpinus hetulus L.) to Water

To measure the rate of longitudinal permeability in hornbeam wood to water, 27 sapwood and 27 heartwood samples of hornbeam species(Carpinus betulus L.) in three diameter classes (25, 50, 75cm) were chosen from one vegetative habitat. By the use of a wood permeability measuring instrument, the flow rate of water in samples was determined while applying constant pressure difference on the two sides of samples. Then, using Darcyʹs law, the permeability of samples was measured. The variations in flow rate and permeability are shown through curves. The results indicate that, contrary to one of main prerequisites for Darcyʹs low, the flow rate and permeability continue to decrease with time.This issue can happen when the intervascular micropores are blocked with external materials or air bubbles. The results also indicate that there is not a significant difference in sapwood and heart wood permeability within different diameter classes, but that there is a significant difference in heartwood and sapwood permeability in each diameter class. The amount of heartwood permeability is approximately 55% less than that in sapwood.