摘 要：本文以施肥和未施肥两种条件下12 年生的5 株I-69 杨（Populus deltoides Bartr.cv.”Lux” exI-69/55）为研究对象，对纤维长度、纤维宽度、长宽比、水分含量、1%NaOH抽提物、纤维素、苯醇抽提物、木素和聚戊糖含量等指标进行了系统测试，并对测试数据进行了统计分析。结果表明：
1）I-69杨经施肥处理后纤维宽度大于未施肥处理的纤维宽度，但施肥处理的纤维长度和长宽比却小于未施肥处理的纤维长度和长宽比。
2）施肥过的I-69杨边材苯醇抽提物和木素的变异系数明显偏大，说明施肥对I-69杨边材间的化学成分变异有很大影响，而对心材化学成分变异不大；未施肥的I-69杨边材和心材的化学成分变异都不大。未施肥I-69杨1%NaOH抽提物和苯醇抽提物含量边材高于心材，而施肥明显降低了I-69杨边材的1%NaOH抽提物含量，使1%NaOH抽提物含量心材高于边材，而苯醇抽提物含量仍然是边材高于心材。
3）施肥和未施肥I-69 杨边材比较各项成分之间差异不显著；施肥和未施肥I-69杨心材比较除水分含量之外，其余各项成分之间差异不显著；施肥I-69杨边材与心材比较除聚戊糖明显差异显著外，其余各项成分之间差异不显著；未施肥I-69 杨边材与心材比较除1%NaOH 抽提物和聚戊糖含量差异显著外，其余各项成分之间差异不显著。
关键词：I-69杨，纤维形态，化学成分
Study on Wood Fiber Morphology and Chemical Composition in Poplar 69
Abstract : In order to investigate the effect of fertilization on wood properties of poplar 69( Populus deltoides Bartr.cv.”Lux” ex I-69/55), 5 trees of poplar 69 with 12 year-old grown in two fertilization conditions were selected as testing materials, and analyzed the wood fiber form (including fiber length, fiber width and ratio of length to width),and chemical composition (including the contents of water, 1% NaOH extractive, cellulost, alcohol extractive，lignin, and pentosan). The results show that: 1) Fertilization treatment has a positive effect on fiber width, but has a negative effect on fiber length and ratio of length to width. 2) Fertilization treatment has great effect on sapwood’s chemical composition of poplar 69,but has no effect on heartwood’s chemical composition; The sapwood’s 1%NaOH and alcohol extractive content of unfertilized poplar 69 are higher than heartwood’s, but fertilization treatment reduce the content of 1%NaOH in sapwood.3) Analysis of variance indicates that the selected fertilization treatment has no significant effect on poplar 69 between sapwood and heartwood except the content of 1%NaOH extractive and pentosan.
Key words: poplar 69, fiber morphology, chemical composition