<正>应用弹塑性断裂力学的Weakest-link破坏准则，分析了竹木复合集装箱底板在弯曲载荷下的破坏模式。结果表明：竹术复合集装箱底板主要发生两种形式的破坏。即底面拉伸破坏和芯层剪切破坏。同时笔者提出了这两种破坏形式下，底板静曲强度的理论预测模型，并应用统计回归模拟方法，研究了单板压缩和涂胶对静曲强度的影响规律。建立了静曲强度和弹性模量的相关模型。

One hundred and thirty seven progenies representing 11 half-sib families in Populus deltoides germplasm garden were analyzed by using twelve SSR primers. One hundred and three alleles were identified, which 8.67 alleles per pair primers (A). Average number of effective alleles (Ne) was 5.37. Aver. age observed heterozygosity (Ho) was 0.39 and average expected heterozygosity (He) was 0.75, of which 10 pair primers were over 0.65. Coefficient of gene differentiation (Gst) was 0.22. Gene diversity (h) of families was from 0.55 to 0.72. The result of cluster analysis by using UPGMA method indicated that identities within families accord with geographic locations.