Poplar is raw material for various panel, paper and fiber products. The 12 sample trees of clone Nanlin-895 from four spacings were destructively harvested after thirteen growing seasons to assess the influence of spacing on radial growth and wood properties. Spacing significantly affected tree-ring width and wood basic density (p < 0.05) but not fiber traits. The highest diameter and wood basic density at breast height (1.3 m) was in 6 m × 6 m and 3 m × 8 m spacings, respectively. However, no significant differences in tree-ring width, wood basic density and fiber traits were observed among the four sampling directions in discs taken at 1.3 m for each spacing. Growth rings from the pith and tree heights had significant effects on wood basic density and fiber anatomical characteristics, highlighting obvious temporal-spatial variations. Pearson correlation analysis showed a significantly negative relationship of tree-ring width to wood basic density, fiber length and fiber width, but a significantly positive relationship to hemicellulose. There was no relationship with cellulose and lignin contents. Based on a comprehensive assessment by the TOPSIS method, the 6 m × 6 m spacing is recommended for producing wood fiber at similar sites in the future.

杨木是各种板材、纸张和纤维制品的原料。在13个生长季节后破坏性收获来自四个间距的克隆Nanlin-895的12棵样品树，以评估间距对径向生长和木材特性的影响。间距显着影响年轮宽度和木材基本密度（p < 0.05) 但不是纤维特性。胸高 (1.3 m) 处的最高直径和木材基本密度分别为 6 m × 6 m 和 3 m × 8 m 间距。然而，在每个间距为1.3 m的圆盘中，四个采样方向在树轮宽度、木材基本密度和纤维性状方面没有观察到显着差异。木髓和树高的年轮对木材基本密度和纤维解剖特征有显着影响，时空变化明显。Pearson相关分析表明，年轮宽度与木材基本密度、纤维长度和纤维宽度呈显着负相关，与半纤维素呈显着正相关。与纤维素和木质素含量无关。基于 TOPSIS 方法的综合评估，