For the rational and sustainable forest use, some representative (reference) areas of ecosystems being high conservation value forests within the leasing estate of Tolshmenskoe, LLC, were selected. After that, the monitoring study for the assessment of the forest breeding, environmental and medium stabilizing functions and the reproduction capacity of the preserved forest ecosystems was carried out. Within the ecosystems, six sample sites were drawn and the survey based on the standard forest ecology methods was performed. The objects of the study (sample sites) were shaped to cover the maximum of all types of forest communities available at the leasing estate. Generally, the monitoring observation showed that the arboreal plants growing in the studied sample sites featured high resistance. The forest formation process is continuous but requires some silvicultural practices, such as appropriate care to stimulate the domination of the economically valuable wood species.

The purpose of the research was to identify, research and assess high conservation value forests (HCVF) and representative areas allocated in the lease base of the enterprise. The object of the research is forest areas of special conservation value in the lease base of the logging enterprise LLC Tolshmenskoye. The subject of the research is the quantitative and qualitative characteristics of the high conservation value forests stands. The research was carried out on four stationary objects, which are represented by coniferous stands. The share of conifers in the composition of the stand is from seven to nine units. The researches were based both on the research performed of forest management and reporting documentation of the enterprise, and on the basis of field research materials. The choice of research objects is due to the fact that these plantations perform the function of preserving biological diversity and are excluded from economic activity, which allows for long-term monitoring observations to assess quantitative and qualitative changes in the structure of forest stands and make conclusions about their performance of target functions. The results of the survey showed that the population of trees is characterized by high classes of sanitary assessment. In terms of health, most tree species show no signs of weakening. The number of healthy specimens according to the objects of research and according to the breed composition is quite high (at least 67%). No significant anthropogenic impacts have been identified. The number of undergrowth varied greatly according to the objects of research. The undergrowth is heterogeneous in composition. At the same time, aspen and spruce occupy the dominant position in the emerging tree canopy.

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The influence of logging activities on the taiga ecosystems of the North-West is ambiguous. As a result of clear felling, tree and shrub vegetation is destroyed, which subsequently, as a result of a sharp change in environmental factors, makes a fundamental change in the biodiversity of the living ground cover. There is a complete change of botanical forest species that are part of the living ground cover for the species diversity characteristic of open landscapes. The overgrowth of clearings with grasses and undergrowths occurs depending on the typological characteristics of the felled stand and the season of the felling year. The subsequent overgrowth of clearings with herbaceous vegetation depends not only on the species composition of reforestation species, but also on various natural conditions - the features of the relief, climatic, soil and hydrological conditions. Therefore, the process of restoration of felling areas is not always positive. In order to ensure rational, sustainable and sustainable forest management, it is necessary for timber industry organizations and specialists of the forestry complex to use various measures prescribed in the “Methodological Recommendations for the Conservation of Biological Diversity in Timber Harvesting in the Vologda Region”.

The paper presents the results of biodiversity assessment on the territories with different ecological conditions. The studies were carried out on the territories during the reforestation period after the anthropogenic load associated with deforestation, as test sites (PP) and forest biogeocenoses adjacent to deforestation and not affected by forestry activities - control (K). The research methods are indicated. The Jacquard and Stugren-Radulescu coefficients, as well as the Sorensen-Chekanovsky and Kulchinsky indices were used to assess the biodiversity. During the survey of the territories, 32 species of animals were found: 1 species belongs to the class of amphibians, 5 - reptiles, 13 - birds and 13 - mammals. The list of the faunal composition of the studied territories is given. As a result of the conducted studies it has been revealed that the qualitative and quantitative characteristics of the faunal composition directly depend on the derived type of forest, the method of deforestation and the environmental conditions prevailing on this territory. Of the territories considered, the greatest faunal diversity (19 species) was observed on the territories with 12-year-old-cut-down forest, with moderately moist soils and predominant floristic diversity. Based on the calculation of the indices and coefficients of similarity and difference, the similarity of the species faunal diversity has been revealed on the territories of mixed-grass and blue joint fellings as well as in the control areas of lingonberry pine. The difference from all the sample areas has been revealed in the meadowsweet felling (PP1) and the adjacent forest biogeocenosis - grass-marsh pine forest.