山杨木材性状及个体内变异的研究*
Study on Wood Quality Characteristics of Populus davidiana and Its Variation of Intra-tree
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摘要: 在山杨主要分布区6省内,各抽样1个天然林分,每个林分随机抽样20株.其中5株伐倒木作标准材性试验;另15株钻取木芯条测试.试验结果:(1)胸径处木芯条的木材密度与纤维长度等与伐倒木测定结果具有一致性;(2)株内髓心向外水平方向年轮组之间,木材密度及纤维长度的差异都极显着(α=0.01),两性状随年龄增大而增长,符合“S曲线”与“Sanio规律”,木材密度与纤维长度的相对增长率的最高值分别在11~20a与6~15a;(3)材性幼一成龄相关,在木材密度与纤维长度性状方面表现不同,主要性状在10~15a进行早期选择具有合理性.Abstract: natural stands were selected respectively from 6 provinces in the main distributing regions of P. davidiana Dode and 20 trees were sampled randomly from each plot.5 among the 20 trees were cut for standard test of wood quality characteristics and the other 15 trees with the increment cores drilled out increment cores at DBH, which are used for contrast and supplemental test. The results of the analysis are as follows:(l)Both wood specific gravity and fiber length of cores agree with those dataum attained by the test of the felled trees. (2)Wood specific gravity and fiber length among annual ring groups of intra-tree are increasing with the increase of tree age,and conform to S curving line and Sanio regularity,whose variations are significant at 0.0l level. The maximum point of relative increasing rate of wood specific gravity and fiber length appear between 11a and 20a,6a and l5a,respectively.(3)Correlation of wood specific gravity of junenil-eadult is slightly different from that of fiber length.It is suggested that early selection of main wood quality characteristics should be carried out during 10~15a.