<正>对竹材不同距地高度径向位置的弯曲性能进行了研究，并应用DENSE-LABX端面密度仪测定竹材沿端面的密度分布情况，分析了密度的变化与竹材弯曲力学性能的关系。结果表明：竹材的静曲强度（MOR）和弹性模量（MOE）沿径向均是从最内层竹黄处向竹青处逐渐增大，MOE的差异更加显著；竹材的弯曲性能随着密度的增大而增加，趋势接近于线性变化。

The aged structure, static life table and survival curve o{ Cerasus cerasoides var. campanulata population were analyzed in this paper. The results show that the aged structure of C. cerasoides var. campanulata population,accounting for 65.1% of all C. cerasoides var. campanulata, distributed mainly within No. Ⅲ level and No. Ⅳ level, which is critical to maintain the dominance in its communities. The number of seedlings and old trees was very low, the whole population of C. cerasoides var. campanulata was in declining. The survival curve was different from the typical Deevey Ⅲ curve, which showed the death rate of C. cerasoides var. campanulata was high on its existing condition or survival rate was limited. The auther suggested that moderate disturbance or artificial forest gaps might be helpful to the breeding of C. cerasoides var. campanulata.