Taxation structure and wood density of pine and spruce in mixed artificial plantations of the Leningrad Region
Cultivation of mixed plantations of pine and spruce allows us to optimize the qualitative and quantitative indicators of growing wood. Evaluation of taxationindicators in plantations with different densities allows us to determine the optimal ratio of species. The study of the qualitative characteristics of pine and spruce timber, in particular wood density, allows us to determine the indicators of the growing volume of pine and spruce timber. The aim of the study is to compare the taxation characteristics of stands with different shares of pine and spruce and wood density of different composition. The studies were conducted in 50-year mixed artificial plantations of pine and spruce with the same primary density of planting, growing on two-member sediments - type of forest site conditions C2. Region of the study Leningrad region, 23 quarter of Orlinsky district forestry Gatchina district forestry. In mixed plantations, three trial plots (TPs) were established along the slope topography, 50m x 50m in size, 0.25 ha each. A continuous count of trees with measuring diameters at the height of 1.3 m and tree heights was carried out. To determine basic wood density by maximum moisture method, pine and spruce wood cores were sampled in all rows of tree distribution in steps of 2 cm thickness at a height of 1.3 m. The study showed that the plantation composition 5E5C formed the most dense wood. The largest stock was formed in the plantation 6E4C, indicating the accumulation of volume and the optimal composition of the plantation. For spruce, an increase in the absolute completeness of its element leads to a decrease in the density of its wood. For pine, an increase or decrease in its wood density also depends on the absolute completeness and density of the accompanying spruce layer.