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分析了５个试验地尾叶桉纸浆材的主要化学成分含量和ｐＨ值在树干高度上的差异和变化趋势．结果表明，在５个试验地中，尾叶桉材的化学成分含量及ｐＨ值在树干高度上的变异情况大致相同．在不同的树干高度上，木材热水抽提物含量、纤维素含量和木素含量的差异达１％显著性水平；质量分数为１％ＮａＯＨ抽提物含量和戊聚糖含量的差异达５％显著性水平；冷水抽提物含量和ｐＨ值无统计上的显著性差异．由树基向上，冷水抽提物、热水抽提物和木素的含量呈渐低趋势；戊聚糖含量和木材ｐＨ值呈渐高趋势；１％ＮａＯＨ抽提物含量树干中部较低，两端较高；纤维素含量树干中部稍高，两端稍低．
The main chemical compositions and pH values of Eucalyptus urophylla in five experimental plots were analyzed for differences and trends in trunk height. The results showed that the contents of chemical constituents and the variation of pH value in the height of trunk of Eucalyptus urophylla were the same in the five experimental plots. The differences of wood hot water extract, cellulose content and lignin content reached 1% significance level at different trunk height; the difference of 1% NaOH extract content and pentosan content reached 5 % Significance level; there is no statistically significant difference between cold water extract content and pH value. The contents of cold water extract, hot water extract and lignin tended to decrease gradually. The content of pentosan and the pH of the wood tended to increase. The content of 1% NaOH extract was lower in the middle part of the trunk, Both ends of the higher cellulose content of the trunk slightly higher central, slightly lower ends.