Abstract
One way to increase the productivity of artificial forestation is to control the density and position of trees relative to each other. Thus, the optimal planting schemes to obtain the maximum stock of wood of a given diameter must be found. A simulation model was used for a comparative analysis of the productivity of spruce stands with different planting schemes. Rectangular and square planting patterns with different initial forest-stand densities are considered. The stock of small (trunk diameter 6–13 cm), medium (14–23 cm), and large (over 24 cm) wood was calculated with respect to the row spacing and the pitch of trees planted on a site 40 × 40 m in size. In the selection of the optimal planting scheme, it is taken into account that there are various seedlings that differ in competitiveness. It is shown that the square planting scheme is optimal when the initial number of seedlings is the same. The optimal distances between trees for the growth of small, medium, and large wood with a square planting pattern were 1.4 × 1.4 m, 2.4 × 2.4 m, and 4 × 4 m, respectively. The spruce stand reached the specified qualitative characteristics corresponding to small, medium, and large wood in 36, 68, and 155 years. Thus, it has been shown that different initial planting densities are required in order to obtain the maximum wood stock for different size classes: the larger the grown wood is, the lower is the optimal planting density.
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This work was performed within the framework of the state assignment of the Institute for Comprehensive Analysis of Regional Problems of the Far East Branch of the Russian Academy of Sciences and with financial support from the Russian Foundation for Basic Research (project no. 18-04-00073 a).
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Kolobov, A.N., Frisman, E.Y. Modeling Analysis of the Productivity of Artificial Spruce Stands with Different Planting Schemes. Biol Bull Rev 11, 293–302 (2021). https://doi.org/10.1134/S207908642103004X
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DOI: https://doi.org/10.1134/S207908642103004X