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为了探讨杨树无性系木材密度、纤维形态及纤维素含量在无性系间和株内的变异模式,对7个杨树无性系胸径处按年轮取样测定了木材密度、纤维长度、纤维宽度和纤维素含量,同时对南林-95和南林-895杨这2个无性系,分别在0、5.6、9.6、13.6、17.6、19.6和21.6m处取样测定其纵向变异。研究结果表明:1)7个杨树无性系胸径处的木材基本密度、纤维素含量、纤维宽度和纤维长宽比存在显著差异;2)木材密度、纤维长度、纤维宽度和纤维素含量在不同生长年轮间也存在显著差异,且由髓心向外呈现逐渐增大的趋势;3)不同树干高度处的平均木材密度、纤维长度和纤维宽度存在显著差异。平均木材密度随树干高度的增加而增大,最小值出现在树干基部,而纤维长度和纤维宽度呈现随树干高度递增逐渐降低的趋势,其最大值均出现在树干的5.6m处;4)回归分析表明:木材密度、纤维长度、纤维宽度和纤维素含量与生长年轮及不同树干高度的关系均可用多项式方程来描述。本文的研究结果可为杨树人工林的定向培育提供理论依据。图8表2参26。
In order to investigate the variation pattern of wood density, fiber morphology and cellulose content between clones and in plants in poplar clones, the density, fiber length and fiber width of wood of seven poplar clones Cellulose content, while the two clones of Nanlin-95 and Nanlin-895 Yang were sampled at 0, 5.6, 9.6, 13.6, 17.6, 19.6 and 21.6m respectively to determine the longitudinal variation. The results showed that: 1) The basic density, cellulose content, fiber width and fiber aspect ratio of 7 poplar clones at breast diameter were significantly different; 2) The difference of wood density, fiber length, fiber width and cellulose content There was also a significant difference between the growth rings, and it was gradually increased from the medulla; 3) There were significant differences in average wood density, fiber length and fiber width at different trunk heights. The average wood density increased with the increase of trunk height, and the minimum value appeared at the base of the trunk. The fiber length and fiber width tended to decrease gradually with the trunk height increasing, and the maximum appeared at 5.6 m of the trunk. 4) The analysis shows that the relationship between wood density, fiber length, fiber width and cellulose content and growth ring and different trunk height can be described by polynomial equation. The results of this paper can provide theoretical basis for directional cultivation of poplar plantations. Figure 8 Table 2 Reference 26.