栽植密度对小黑杨人工林木材解剖特性的影响

以山西朔州地区的小黑杨人工林为研究材料,研究不同栽植密度(1 000、500、250株·hm-2)对小黑杨木材解剖特性的影响.结果表明:栽植密度对纤维宽度、双壁厚、导管比量、胞壁率、导管个数、导管弦向直径的影响达极显著水平;对壁腔比的影响达显著水平;对纤维长度、长宽比、纤维比量、射线比量虽有一定的影响,但不显著.栽植密度与纤维宽度、导管直径呈负相关关系,与导管个数和比量呈正的相关关系.栽植密度对纤维形态的径向变异有不同程度的影响,但不改变纤维形态变异的一般规律.纤维长度的径向变异为从髓心至树皮向外逐渐增加,到第12 轮达到最大值后略有下降,纤维宽度、长宽比、双壁厚、腔径的径向变异类似于纤维长度;壁腔比的总体径向变异为沿髓心向外,呈先升后降的波动性变异趋势.

Effects of Planting Density on Wood Anatomical Properties of Populus×xiaohei

The effects of different planting densities(1 000,500,250 trees·hm^-2)on anatomical properties of Populus×xiaohei were studied in Shuozhou County,Shanxi Province.The results indicated that the effects of planting densities on fiber width,double wall thickness,vessel ratio,fiber wall ratio,vessel number,vessel tangential diameter were highly significant,and that on ratio of wall to lumen was significant,but for the fiber length,ratio of length to width,tissue ratio of fibers and rays were not significant.The planting densities had certain effects on the radial variation of fiber properties.The results showed an initially rapid and then gentle increase of fiber length and width,fiber wall thickness and ratio of length to width from pith to outward,while ratio of fiber wall to lumen gradually decreased and then tended to stable.