Author:
Koppán András,Szarka László,Wesztergom Viktor
Abstract
Electric potential differences (EPD) had been continuously recorded for four years from 1997 until 2001 between electrodes inserted in sixteen selected sites of the trunk of a turkey oak (Quercus cerris L.). In our earlier paper (Koppán et al. 2000), by using this method we revealed the annual variation of amplitudes of diurnal sap-flow fluctuation. In this paper a comparative analysis is carried out in order to study the local variability of sap-flow within the trunk. Values of EPDs were compared at four different height levels and four different exposures of the trunk. A significant difference can be shown between the channels of Eastern and Western side, while the deviations between the height levels are slight. The most likely reason for the differences between the channels is structural inhomogeneity.
Publisher
Acta Silvatica et Lignaria Hungarica
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