Measurement of electric potential difference on trees

András Koppán, András Fenyvesi, László Szarka, Viktor Wesztergom

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16 Citations (Scopus)


Electrical potential differences have been continuously recorded since 1997 between electrodes inserted in sixteen selected sites of the trunk of a Turkey oak (Quercus cerris L.) and in the ground. The measured electric potential difference data have a characteristic sinusoidal daily variation. The annual fluctuation of the mean daily amplitudes of these diurnal variations has at least two maxima per year. We found a remarkable correlation between electric potential differences (EPD), the water potential of air and sap flux density data. It means that the EPD follows the variations of the sap flow intensity.

Original languageEnglish
Pages (from-to)37-38
Number of pages2
JournalActa Biologica Szegediensis
Issue number3-4
Publication statusPublished - Jan 1 2002



  • Electric potential difference
  • Sap flow
  • Turkey oak

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

Cite this

Koppán, A., Fenyvesi, A., Szarka, L., & Wesztergom, V. (2002). Measurement of electric potential difference on trees. Acta Biologica Szegediensis, 46(3-4), 37-38.