Long-term dynamics parcellary structure of forest phytocenoses in clearings of birch forests with the preservation of the second layer of spruce in the southern taiga

The article presents the results of studying the dynamics of the parcel structure of forest phytocenoses after cutting of birch (Betula pendula Roth.) with preservation of the second tier of spruce (Picea abies L.). Studies conducted in the southern taiga, Northern forest experimental station of Institute of forest science Russian Academy of Sciences (Yaroslavl region, Rybinsk district) on three permanent sample plots in the prevailing forest types - P. myrtillosum, P. oxalidosum and P. oxalidosum-sphagnosum, the most widely represented in the southern taiga [1]. Trial areas were laid on cutting down of 75-year-old birch trees 18 years after felling, repeated observations were made 10 and 20 years later. Felling of the forest was aimed at the preservation of the second layer of spruce, the majority of small timber died in the first years after the removal of the birch canopy as a result of damage caused by falling trees left. The article sets out the methodology for the allocation of parcels by the structural features of all tiers of phytocoenosis - tree, shrub, herb-shrub...