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.

中文翻译：

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不同种植方案人工云杉林生产力建模分析

摘要

提高人工造林生产力的一种方法是控制树木的密度和相对位置。因此，必须找到获得最大给定直径木材库存的最佳种植方案。使用模拟模型对不同种植方案的云杉林分生产力进行了比较分析。考虑了具有不同初始林分密度的矩形和方形种植模式。小（树干直径 6-13 厘米）、中（14-23 厘米）和大（超过 24 厘米）木材的存量是根据行距和种植在 40 × 40 m 场地上的树木节距计算的在尺寸方面。在选择最佳种植方案时，要考虑到各种苗木的竞争力不同。结果表明，当初始苗数相同时，方形种植方案最佳。方形种植模式的小、中、大木生长的最佳树间距分别为1.4×1.4 m、2.4×2.4 m和4×4 m。云杉林在 36、68 和 155 年中达到了与小、中、大木材相对应的规定质量特征。因此，已经表明需要不同的初始种植密度才能获得不同尺寸等级的最大木材库存：种植的木材越大，最佳种植密度越低。分别。云杉林在 36、68 和 155 年中达到了与小、中、大木材相对应的规定质量特征。因此，已经表明需要不同的初始种植密度才能获得不同尺寸等级的最大木材库存：种植的木材越大，最佳种植密度越低。分别。云杉林在 36、68 和 155 年中达到了与小、中、大木材相对应的规定质量特征。因此，已经表明需要不同的初始种植密度才能获得不同尺寸等级的最大木材库存：种植的木材越大，最佳种植密度越低。