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研究三种不同立地指数下红皮云杉人工林木材的管胞形态及其径向变异规律：（１）三种立地指数下木材管胞形态特征有着相同的径向变化模式；（２）根据管胞形态的径向变异规律，三种立地指数下木材管胞达到成熟的年龄基本相同，均在１８～２０年间；（３）立地指数对木材管胞长度、管胞长宽比和壁腔比有影响，且总的趋势是其值随立地指数增大而增加。
To study the tracheid morphology and its radial variation pattern of three types of Picea mongolica plantations with different site indexes: (1) The morphological traits of wood tracheids have the same radial variation pattern under three kinds of site indexes; (2) The radial variation of tracheid morphology and the age at which wood tracheids reach maturity under the three kinds of site indexes are basically the same, all within 18 to 20 years. (3) The site index of wood tracheids length, tracheid length-width ratio, The overall trend is that its value increases with increasing site index.