The article deals with the interrelation of forest canopy of trees and high-rise structures of spruce undergrowth of different phenological forms in pleurocarpous moss group of forest type in conditions of Leningrad region. The analysis of high-rise structures of different phenological forms depending on the composition and structure of forest in the most represented types of forests in Leningrad region is made. For further insights on the role of composition and structure of forest stand as factors determining high-rise structure of different phenological forms of undergrowth of spruce, analysis of variance was conducted. Decrease in the share of large height spruce undergrowth of all phenological forms in the increase of participation of spruce in the growing stock, with increasing elative completeness of forest stand, its age and stock, allowed to conclude that the structure of natural regeneration of spruce on height is affected by the degree of illumination under the canopy of forest stand. Analysis of altitudinal structure of spruce undergrowth in different phenological forms in height, depending on forest type showed that proportion of the undergrowth of all phenological forms is higher in dry forest types than in wet forest. From this we can conclude that high-rise structure of spruce undergrowth in different phenological forms is influenced not only by illuminance under the canopy of the forest, but also fertility of soil, its physical and chemical properties. Conducted analysis of variance confirmed statistically significant dependence of this factor. As a result of conducted research it can be concluded, that in conditions of middle taiga of all biocenotic factors factors, forest type and composition of stands have greater influence on high-rise structure of phenological forms of spruce undergrowth.
In the article features are considered after forest fire regeneration processes in pine stands in the Luga and Putilov landscapes related to two forest districts of the Leningrad region. Quantitative and qualitative comparative analysis was carried out with the help of statistical methods of investigation: dispersion and rank analysis. The quantitative differences in the renewal dynamics of pine in cowberry and bilberry forest types on post-pyrogenic sites and under the parent stand in both regions of the study were determined based on the analysis of variance. The study showed a significant difference in the successful resumption of pine after a grassroots fire for the Luzhsky and Kirovsky forestry's. The use of rank analysis using the Spearman coefficient made it possible to establish differences in the qualitative characteristics of pine undergrowth and to reveal the nature of the orientation of reforestation processes after grassroots fires. The conducted research has shown that landscape conditions exert a great influence on the nature of pine renewal, on the indicators of occurrence, vital state, abundance. The indicator of rank evaluation of the qualitative characteristics of pine undergrowth allowed them to compare and identify those that are crucial for growth under certain conditions. It is concluded that the landscape and soil-hydrological growth conditions are the leading factors in the quantitative representation of the undergrowth that arose after the grassland fires, and, depending on these conditions, a pioneering growth strategy for pine as a species is manifested. The study showed that in the same forest-typological conditions, but in different landscape areas, the renewal of pine can differ in its quantitative and qualitative characteristics.
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