Ecological and cenotic activity of ground cover plant species at the initial stages of forest crops formation in middle taiga subzone

The ground cover of forest crops at the initial stages of the formation of forest plantations are unique forest biogeocenoses, characterized by peculiar ecological conditions, features of regenerative succession and biological diversity of the ground cover.
The features of restorative successions of herbaceous vegetation at the initial stages (the second decade) of the formation of pine and spruce forest crops in the conditions of the former glacial felling from under cranberry pine on the territory of the Kargopol forestry in the southwestern part of the Arkhangelsk region are studied.
The purpose of the research is to study the floral composition and ecological–cenotic structure of the ground cover of forest crops, depending on forest growing conditions and methods of tillage.
The species richness of plants on experimental plots of forest crops with different methods of soil preparation varies from 32 to 39 species. The coefficients of similarity of the species composition of the flora in the studied sample areas vary from 0.63 to 0.80.
The floral composition of the ground cover is mainly represented by species of the mesophyte group (87%). Depending on the illumination conditions, heliophytic (47%) and semigeliophytic species (38%), growing in a wide range of illumination predominate. Mesotrophic species predominate in terms of plant requirements for soil nutrition (89%). No plants from the oligotrophic group were found on the studied area.
The studied plant communities at this time stage are characterized by the predominance of meadow species (64%) with a significant participation of forest species (36%). Based on the analysis of the phytocenotic structure, it can be concluded that more than half of the species of living ground cover are accidental and temporary species that are weeds of forest nurseries of the Middle Taiga subzone (51%). At the same time, the abundance of most species of the weed group is less than one.
The classification of phytocenotic activity of plants is given. The basis of the community consists of highly active species (Deschampsia caespitosa L., Calamagrostis epigeios L., Trifolium pratense L., Rubus saxatilis L., Chamerion angustifolium L.), most of which were represented at the glacier cutting before the creation of forest crops. Low-active and inactive species make up a significant part of the species spectrum (43%). Groups of low-active and inactive plants are characterized by high cenotic diversity.

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