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对３种不同海拔高度白桦木材解剖特征径向变异模式进行了研究。结果表明：①３种不同海拔高度白桦木材解剖材性指标的径向变异模式为ｙ＝ａ＋ｂｌｎｘ，此模型具有典型的生物学意义。②单管孔径、弦向直径，复管孔平均直径平均值相比４６０ｍ＞６５０ｍ＞６１０ｍ．差异显著。③海拔高度对复管孔平均壁厚、胞壁率、壁腔比有显著影响。白桦作为纸浆材培育时，选择高海拔地区最佳。
The radial variations of anatomical characteristics of white birch wood from three different altitudes were studied. The results showed as follows: ① The radial variation pattern of anatomical indexes of white birch wood at three altitudes is y = a + blnx. The model has typical biological significance. ② single pipe diameter, chord diameter, average diameter of complex pipe compared 460m> 650m> 610m. Significant difference. ③ Altitude had a significant effect on the average wall thickness, cell wall ratio and wall cavity ratio in the composite tube. When birch is cultivated as a pulp material, it is best to choose high altitude areas.