对不同种植密度的尾叶桉 (Eucalyptusurophylla)木材细胞形态结构进行测试和分析 ,探讨种植密度与木材纤维、导管分子和薄壁细胞的作用规律和相关模型。结果表明 :种植密度与木纤维宽度、导管分子长度之间存在着显著的正相关 ,与导管分子的双壁厚之间存在着显著的负相关 ;种植密度对其余测试的指标影响不大 The morphological structure of Eucalyptus urophylla wood from different planting densities was tested and analyzed. The effects of planting density on wood fiber, ductal molecules and parenchyma cells were investigated. The results showed that there was a significant positive correlation between the planting density and the width of the wood fiber and the length of the catheter, and there was a significant negative correlation between the density of the catheter and the double wall thickness of the catheter. The planting density had little effect on the indexes of other tests