Standard table of sums of areas of cross-sections and stocks of normal stands of gray alder (Alnus incana (L) Moench) at a density of 1.0 in the European northeast of the Russian Federation

In modern conditions, successions occur on former meadows and pastures in the territory of the European north-east of the Russian Federation, resulting in an increase in the area of phytocenoses with a predominance of gray alder forests, but insufficient attention has been paid to the study of their growth and development. Gray alder in the region forms mixed stands most often with willow and birch, less often with spruce and Scots pine, and sometimes with aspen. Due to the ability to absorb free nitrogen from the air due to the presence of nitrogen-fixing bacteria on the roots, gray alder increases the fertility of poor soils typical of the European north-east of the Russian Federation. Based on the analysis of the current regulatory and information support, it was established that there is no standard table of the sums of the cross-sectional areas for normal gray alder stands at a density of 1.0 for the European north-east of the Russian Federation. The aim of the study is to develop a standard table of the sums of the crosssectional areas and stocks of normal gray alder stands at a relative density of 1.0. The experimental material was the data of 175 sample plots located in gray alder stands of Ia-IV bonity classes aged 5 to 85 years. The compiled table of the sums of the cross-sectional areas and stocks depending on the average height of the stands can be used in the taiga zone of the northeast to determine the density of gray alder stands during enumeration taxation and to adjust the stock of stands during visual taxation. This, in turn, allows for more accurate accounting and assessment of the wood stock, to establish an additional volume of wood in gray alder stands.

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