The results of research on the productivity of birch stands on the territory of the Udmurt Republic belonging to the region of southern taiga forests of the European part of the Russian Federation, the taiga zone are presented. The dynamics of the area and reserves of birch forests in the Udmurt Republic is analyzed. Based on the sample area data, changes in the percentage of business wood yield were revealed depending on the type of forest, the composition coefficient and the age of the forest element stand. A comparison of birch stocks growing in different types of forests is made.

Article InfoThe article presents the results of complex research (research was conducted in 2019) of the Botanical natural monument territory "Pine forest near Venetsiya village" (Russia). In 2007, part of the nature monument territory was destroyed by a hurricane, resulting in massive windfall. The purpose of the research was to study the processes of evolution of natural complexes (vegetation and soil cover) in the areas affected by the hurricane. Classification of vegetation was done according to the Braun-Blanquet and Kopečký and Hejný approaches. NDVI (Normalized Difference Vegetation Index) was used to estimate the amount of photosynthetically active biomass. Changes in morphological, physical and chemical properties were studied in the soil cover. The conducted research showed that the vegetation of the natural monument is represented by relict pine and broad-leaved pine forests. Under the pine canopy linden and birch are dominated. In the herb layer grow in various combinations of nemoral and boreal species. Soil cover is represented by Gray-humus (Umbric Luvisol). There is a strong transformation of vegetation in the areas damaged by the hurricane in 12 years (2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016)(2017)(2018)(2019). There is an active formation of highly productive herbaceous vegetation and renewal of deciduous stands, which leads to an increase in biomass (confirmed by changes in NDVI). The terminal stage of the restoration succession will be the formation of secondary deciduous and mixed nemoral forests. The active development of grass vegetation leads to the formation of a sod horizon on the surface of the soil with a thickness of about 14 cm. There is also an increase in the content of organic carbon, alkaline-hydrolyzable nitrogen and mobile phosphorus, the value of electrical resistivity increases and acidification of the soil solution.

The study results of honey-leaf stands productivity in the Udmurt Republic, belonging to the area of the southern taiga forests of the taiga zone of the European part of the Russian Federation, are presented. Based on the data obtained at the accounting apiaries and control hives, the change in the honey weight gain was revealed depending on the weather conditions, the composition coefficient and the age of the linden stand.