造林密度对5年生‘XL-90 杨’生长量的影响

唐 洁; 李永进; 杨 艳; 汤玉喜; 贺光宗; 黄爱民

doi:10.3969/j.issn.1001-3776.2020.03.010

造林密度对5年生‘XL-90 杨’生长量的影响

Effect of Different Planting Density on Increment of Populus deltoides ‘Xianglin 90’

摘要

摘要: 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。

Abstract: In March 2016, 1-year Populus deltoides ‘Xianglin 90’ seedlings were planted with 6 density in Yiyang, Hunan province. In December 2019, sample plots were established for tally. The results showed that average DBH, tree height and single tree volume increased with decrease of density. The experiment demonstrated that plantation with density of 417 tree/ha and spacing in and between the rows of 4 m×6 m had the maximum growth index, mean DBH of 23.27 cm, mean height of 17.13 cm and volume of 0.291 m3, which was significantly different from the other planting densities (P<0.05). Plantation with density of 833 tree/ha (3 m×4 m), had the maximum stand volume of 140.25 m3/ha. The experiment resulted that the best planting density of P. deltoides ‘Xianglin 90’ was 417 and 833 tree/ha.

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