Investigation of Cambial Electrical Resistance in Declining Spruce (Picea abies L.)

1989

S. 373-385

6 Abb., 3 Tab., 20 Lit. Ang.

Unselbständiges Werk

200041117

Simultaneously, the influence of a number of factors (position of the electrodes on the trunk, number of measurements, diameter of the tree and external conditions) was evaluated. In healthy spruce, it appears that resistance increases when the diameter of the trees decreases, and that this relation between resistance and diameter depends on the stand (influence of soil fertility?). In declining spruce, we show that this phenomenon leads to a significant increase in cambial electrical resistance, and that the smaler the diameter of the spruce, the more important this increase is. This study points out that the cambial electrical resistance measurements corroborate the results provided by conventional methods (rate of needle loss), but by quantifying, specifying and magnifying them. Therefore the cambial electrical resistance measurements can be used in symptomatology to provide a rapid assessment in the field of the degree of vitality in declining spruce over time.