Temporal Variation of Electrical Signal Recorded in a Standing Tree

摘要: In a geophysically motivated experiment, two pairs of electrodes were deepened in the sapwood beech tree (Fagus sylvatica), standing botanic garden Sopron University and potential differences recorded for more than one year with sampling interval 1 minute. The environmental parameters (such as meteorology, atmospheric electricity, geomagnetic field variation) simultaneously measured partly at same location, Nagycenk Geophysical Observatory. records show complicated response to electric effects. difference curves belonging closely-spaced are quasi-parallel, but sometimes they seem be contradictory. case low level electricity when there was no precipitation, springtime, we observed characteristic sinusoidal signals period exactly day peak-to-peak amplitude about ten millivolts. According Morat et al. (1994) might connected daily variation sap flow. our phenomenon appeared smaller (about 10 mV from peak-to-peak) experiment by (1994). inflexion points variations midnight noon; maximum appears morning hours.