The influence of the stand composition on the productivity of pine and spruce stands in different forest types on the territory of the Lisino Educational and Experimental Forestry Unit of the Leningrad Region

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A study of the productivity of pine and spruce stands in various forest types growing on the territory of the Leningrad Region was carried out. Forest inventory materials were used to conduct a comparative analysis by forest type and stand composition. The analysis ANOVA was used to establish significant differences between spruce and pine stands.. The largest growing stock in stands with a predominance of pine was recorded when a share of pine in the stand composition ranged from 70 to 100%. The largest growing stock of pine trees was recorded in the Oxalis acetosella - Vaccinium myrtillus and Vaccinium myrtillus - Polytrichoso-Sphagnosa forest types. In the stands with a predominance of spruce, the largest growing stock of this species was recorded in the stands with 70 – 90% of spruce. The largest growing stock of spruce was formed in Oxalis acetosella - Vaccinium myrtillus forest types. Our studies have shown that pine-dominated forest stands were more productive in a wider range of forest types than spruce stands. In general, this is due to the fact that the sample under consideration was within the optimum growing conditions for each species, and the stands formed within these boundaries were stable and productive.