探究不同间伐强度对青山杨人工林生长及木材性状的影响，为东北地区培育杨树优质工业资源材提供理论基础。以18年生青山杨为试验材料，以初植株行距2 m×3 m为对照，设置3种强度的间伐处理（4 m×3 m、 6 m×3 m、4 m×6 m）。间伐后第5年对试验林的生长性状（树高、胸径、2米径、冠幅）及木材性状（基本密度、纤维长、纤维宽、半纤维素含量、纤维素含量、综纤维素含量、木质素含量）进行了测定，并利用树高、胸径计算出单株材积及单位面积蓄积。方差分析结果表明，除基本密度外，各指标差异均达到极显著水平（P<0.01）。均值分析结果表明，林木各生长指标与木质素含量的均值在株行距为6 m×3 m时达到最大，其余各木材指标均在株行距为4 m×3 m或6 m×4 m时达到最大；各测定指标表型变异系数变化范围为3.35%~29.87%；除基本密度外，各指标重复力均超过0.590。相关性分析结果表明，各生长指标间均达显著正相关水平（0.690<r<0.993），而木材性状间及生长性状与木材性状间的相关性较弱。分别以生长性状、木材性状及联合生长与木材性状为评价指标对各处理进行综合评价后发现，Q_i 分别在株行距为6 m×3 m、4 m×6 m及4 m×6 m时达到最大。间伐能够促进林分生长，改良林木材性，且保留株行距为4 m×6 m时，林木材性及生长与木材综合改良效果较为优良；保留株行距为6 m×3 m时，林木生长效果最好。因此，今后可根据培育目标的不同选择适宜的间伐强度进行东北地区杨树优质工业资源材的培育。

To explore the effects of different thinning intensity on the growth and wood properties of Populus pseudo-cathyana×Populus deltoids plantation， and to provide a theoretical basis for cultivating high-quality industrial resources of poplar in northeast China， the 18-year old Populus pseudo-cathyana×Populus deltoids was used as the material， and the initial plant row spacing of 2 m×3 m was used as the control， and the thinning treatments of 3 m×3 m， 6 m×3 m， 4 m×6 m were set up. The growth characteristics（tree height， DBH， 2 m diameter， crown width） and wood properties（basic density， fiber length， fiber width， hemicellulose content， cellulose content， semi-cellulose content， lignin content） of the experimental forest were measured in the 5th year after thinning， and the volume per tree and the storage per unit area were calculated using tree height and DBH. The results of variance analysis showed that all indexes were significantly different except basic density （P<0.01）. The results of mean analysis showed that the mean values of each growth index and lignin content reached the maximum when the row spacing was 6 m×3 m， and the other wood indexes reached the maximum when the row spacing was 4 m×3 m or 6 m×4 m. The variation of phenotypic coefficient of each index ranged from 3.35% to 29.87%. In addition to the basic density， the repetitive force of each index exceeded 0.590. The results of correlation analysis showed that there were significant positive correlations among the growth indicators（0.690<r<0.993）， but the correlation between wood traits and growth traits was weak. It was found that Q_i reached the maximum when the row spacing was 6 m×3 m， 4 m×6 m and 4 m×6 m， respectively， by using growth traits， wood traits and combined growth and wood traits as evaluation indexes. Thinning might promote the growth of stand and improve the wood property of the forest， and the wood property and the comprehensive improvement effect of the forest growth and wood would be better when the row spacing of the trees is 4 m×6 m. The best growth results were obtained when the row spacing was 6 m×3 m. Therefore， suitable thinning intensity might be selected according to different cultivation objectives for the cultivation of poplar high quality industrial resources in northeast China in the future.