Diagnozowanie stanu zdrowotnego drzew świerka i jodły na podstawie oceny patologicznych zmian drewna korzeni grubych

The paper contains a description and results of direct and indirect methods for assessing pathological changes in the zone of coarse root wood of spruce and fir trees. It also provides an evaluation of the effect of the type of changes and width of the unchanged wood zone on the electrical conductivity. The macroscopic analysis was compared with the results of electrical current measurements and the effect of the detected changes on crown condition and diameter increment of trees.