造林密度对5年生XL-90杨生长量的影响

以 5 年生不同造林密度南方型美洲黑杨‘XL-90 杨’Populus deltoides ‘Xianglin 90’人工林为研究对象，通过分析林分平均胸径、树高、单株材积和蓄积量等指标，探究不同造林密度对‘XL-90 杨’生长量的影响。结果表明，（1）随着造林密度的减小，林分的平均胸径、树高、单株材积呈先增加后减小的趋势，在造林密度减小至417 株·hm-2且株行距为 4 m×6 m 时，各项生长指标达均到最大值，分别为 23.27 cm，17.13 m 和 0.291 m3，与其他造林密度间的差异达均到了显著水平（P＜0.05）；（2）不同造林密度林分蓄积量呈不规律变化，在造林密度为 833 株·hm-2 且株行距为 3 m×4 m 时，林分的蓄积量达到最大值，为 140.25 m3·hm-2；（3）采用因子分析综合评价方法确定5年生‘XL-90杨’以单株材积、林分蓄积量为培育目的最佳造林密度分别为417株·hm-2和833株·hm-2。

This study took 5-year-old plantations of southern-type Populus deltoides 'XL-90' (Populus deltoides 'Xianglin 90') with different planting densities as the research object. By analyzing indicators such as stand mean diameter at breast height (DBH), tree height, individual tree volume, and stand volume, the effects of varying planting densities on the growth of 'XL-90' poplar were explored. The results are as follows:
(1) With the decrease of planting density, the stand mean DBH, tree height, and individual tree volume first increased and then decreased. When the planting density was reduced to 417 trees·hm⁻² with a spacing of 4 m × 6 m, all growth indicators reached their maximum values, which were 23.27 cm, 17.13 m, and 0.291 m³ respectively, and the differences between this treatment and other planting densities were statistically significant (P < 0.05);
(2) The stand volume of stands with different planting densities exhibited irregular changes. The maximum stand volume was achieved at a planting density of 833 trees·hm⁻² with a spacing of 3 m × 4 m, reaching 140.25 m³·hm⁻²;
(3) Using a comprehensive evaluation method based on factor analysis, the optimal planting densities for 5-year-old 'XL-90' poplar with the cultivation objectives of individual tree volume and stand volume were determined to be 417 trees·hm⁻² and 833 trees·hm⁻², respectively.

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该数据集研究了不同造林密度对5年生南方型美洲黑杨‘XL-90杨’人工林生长量的影响，通过分析胸径、树高、材积和蓄积量等指标，发现生长指标随密度变化呈现特定趋势，并确定了以单株材积和林分蓄积量为目标的最佳造林密度。