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本文通过对29株樟子松(Pinus sylvestris var. mongolica)天然林个体的研究,证明樟子松天然林个体的树高、胸径的变异随年龄增大而减小,18a是生长变异由剧烈分化趋向稳定的转折年龄,此时树高、胸径与晚期材积的相关均达到极显著,选择效率也达到最高水平,初步确定18a是该地区樟子松早期选择的最佳年龄。早期选择应以树高为主要指标,胸径作为辅助指标。可用18a生的树高与胸径平方预测51a的材积。
In this paper, 29 species of Pinus sylvestris var. Mongolica natural forest individuals, natural provenience Pinus sylvestris var. Mongolica individual tree height, DBH variation decreases with age, 18a is the growth variation caused by the violent differentiation The trend of stable turning age, at this time the correlation between tree height, DBH and late volume reached extremely significant, and the selection efficiency also reached the highest level. It was initially determined that 18 years was the best age for Pinus sylvestris early selection in this area. Early selection should be based on tree height as the main index, diameter as a secondary indicator. Available 18a raw height and breast diameter squared prediction 51a volume.