Wildfires are the most dangerous destabilizing factors for forest ecosystems. Due to the increasing climate aridity, the risk remains high for the growth of forest fires frequency. Therefore, developing science-based forest practices to mitigate the ecological, economic and social loses caused by forest fires is an urgent topic. The indicators describing visual manifestations of tree damage after surface fires and middle-aged Pinus sylvestris L. trees fire resistance have been improved and refined. It was found that with an increase of average bark char height, the number of dead trees in the studied tree groups also increases (r = 0.87, tf = 5.80, t0.01 = 3.17). It was determined that the fire resistance of trees increases with the growth of natural degree of tree thickness in the pine stand (statistically significant correlation was found between the natural degree of thickness and the health condition of damaged trees: r = -0.54; p = 0.05. A prognostic mortality model to determine the probability of mortality of individual trees damaged by surface summer fires has been developed. It includes the average height of bark char and natural degree of thickness as predictors. At that, the accuracy of the forecast model is over 78%.
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