The aim of the study was to determine the basic morphometric indicators of pine fire resistance in typical stands within Left Bank Forest-Steppe and their changes with stand aging. Fire resistance determines the degree of potential stability of a tree to maintain its activity at the individual level after pyrogenic damage. It has been found that the height of the rough bark upper limit depends most on the DBH (r = 0.97) and the age of the trees (Ff = 83.2, Fst = 1.8). It was determined that the thickness of the bark at all heights of samplings is usually greater in trees with a greater height of the rough bark; in the area of transition of the rough bark to the thin one its thickness is 0.1–0.9 mm. The thickness of the bark at the ground level of the pine trees is 10 to 15 times the thickness of the bark in the crackles, where it reaches
1.5–5.8 mm. Therefore, during surface fires there is a risk of locally damaged cambium along the crackles. Taking into account these results, a prediction model has been developed, which can be used to estimate approximately the height of the rough bark upper limit for individual pine trees and for stands.
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