Subcanopy forest regeneration in the national park "Ugra"

The article examines various aspects of natural forest regeneration in the zone of mixed forests, by formations and forest types. Anthropogenic impact, development of undergrowth, and other factors were considered. Case studies were conducted in the national park «Ugra». The importance of the study is related to the fact that on the border of mixed and broadleaved forests, the main forest-forming species often grow under non-optimal conditions. Under such conditions, the most important element in predicting the dynamics of species composition is undergrowth inventory and the assessment of changes in its density, composition, and state. In the national park «Ugra» in 2014-2017, we have established 54 permanent observation plots (POP) in various formations and site conditions. Along with the detailed description of the stand, the undergrowth and shrubs were registered on test plots within the POP. Vital specimens were considered, being divided into size categories, with followed recalculation into a large one...