Dynamics of phytocenosis parcellar structure after selective sanitary felling in a spruce-pine plant

The mosaic nature of the components in the forest biogeocenosis is expressed in biogeocenotic parcels. The parcel structure of the phytocenosis allows a more detailed assessment of the presence, species diversity, nature of the distribution of plants over the area and the prospect of natural renewal. The dynamics of the parcel structure of forest phytocenoses (biogeocenoses) over time after anthropogenic impact on them is poorly understood. The purpose of the study is to analyze the parcel structure of forest biogeocenosis and its dynamics after selective sanitary felling. The study area belongs to the mixed forest zone, a forest-growing area of pine forests on the left bank of the river Desna and is part of the Bryansk forest massif. The climate of the study area is temperate continental, characterized by an average annual air temperature of + 4.9 ºС, and an average annual precipitation of 700 mm. The object of research is a spruce-pine plantation, which, as a result of selective sanitary felling, has been reorganized into a pine hazel-hoof type forest. Isolation of plant parcels in the studied planting was carried out according to the method of N.V. Dylis, accounting of plant components – according to generally accepted methods. An increase in the number of parcels was noted in the first years after logging, which leads to the need to group them for economic purposes. Four years after logging, species typical of open areas change to forest shade-tolerant species, their occurrence and projective cover increase. The spatial structure of parcels has also changed. The bream-new-maple-linden parcel predominates (46%), maple-linden occupies 28% of the area, linden – 24%, and raspberry occupies the smallest area – 2%. On the technological corridors of the cutting area, the grass vegetation is replaced by trees, shrubs and forest herbaceous species. In places where logging residues were burned, trees, shrubs and herbaceous vegetation also expanded. The use of the parcel structure of phytocenoses, the patterns of its development and the management of this process in selective cutting areas will allow a rational approach to the process of forming productive, optimal forest phytocenoses in the forest park zone.

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