Modeling of the biological productivity of pine forests by age groups of subjects of the Central Federation District of the Russian Federation

Abstract

The purpose of the research was to develop a model for the digitalization of the biological productivity standards for forest stands based on conversion coefficients (c_av) averaged by age groups. At the present stage of forestry, one of the priority areas of research is the assessment of the biological productivity of forest stands by individual fractions of phytomass (biomass of trunks, branches, bark, needles (foliage), roots), the determination of their bioenergy potential, the accumulation of carbon by forest elements in all the diversity of species, age and spatial structure of plantations. Studies of the climate-regulating function of forests, and first of all, the assessment of their absorption of carbon dioxide and carbon sequestration, are recognized as relevant. To solve this problem on a large scale, it is recommended to use conversion coefficients of wood stock into phytomass, taking into account the latitudinal strip of the terrain and age groups of stands. As a result, using the example of pine forests of the Central Federal District, a multidimensional model of changes in phytomass fractions in 17 constituent entities of the Russian Federation depending on the completeness, share of pine in the composition, average height and age group of stands was obtained. The resulting model is functional, characterized by a coefficient of determination R² = 1.0 and a standard error ES = ± 0.2%, and only a tool for digitalization of biomass standards for individual fractions of phytomass. However, the use of the standard model a priori cannot exceed the accuracy of determining the average values of conversion coefficients obtained in the context of age groups.