Analysis of post-fire effects in pine stands in various landscape conditions of the boreal zone

The study analyzes the pyrogenic effect on the condition of pine trees in two landscapes of the Leningrad region. The polynomial regression method in the description of the process tree attrition depending on the scorch height on the trunk allowed determining the trend of the thinning process for pine trees in different vitality conditions. The post-fire attrition of trees follows different scenarios in the studied landscapes of the Luga Upland and Putilov Plateau. The correlation analysis showed that the inverse relationship between the thickness of the remaining forest ground cover and the scorch height on trunks, i.e., the intensity of the past fire, is stronger in the landscape of the Putilov Plateau than in the Luga landscape. The studied landscapes created a different environment for the emergence and spread of fires of both natural and anthropogenic origin.