大花序桉木材顺纹抗压强度变异研究

Studies on Longitudinal Compressive Strength Variance of Eucalyptus cloeziana

以18 a生的11个大花序桉种源木材为研究对象,分析了种源间、单株间、树干高度上的木材顺纹抗压强度的变异情况,结果表明,大花序桉部分种源间、株间及高度间木材顺纹抗压强度均有显著差异,B85号种源的顺纹抗压强度最大,为83.4 MPa;12195号种源的最小,为69.8 MPa,并显著小于B85、17008等6个种源。各种源木材顺纹抗压强度沿树干高度的变化并不相同,有的呈递增趋势,有的呈递减趋势,有的先增后减,有的先减后增。因此,在种源选择基础上,应进一步进行单株选择,以便在更大程度上提高大花序桉木材顺纹抗压强度改良效果。大花序桉种源木材顺纹抗压强度和树高、胸径等生长性状相关性不明显,可相互进行独立改良,因而可望同时获得生长快和木材顺纹抗压强度高的改良成效。

By analyzing the longitudinal compressive strength of wood in the provenances, individuals and different tree heights of 11 provenances 18 years old Eucalyptus cloeziana, the results showed that most of them were different significantly. On the longitudinal compressive strength between different provenances, the B85 was the largest among all the materials, which was 83.4 MPa. The 12195 was the smallest, only 69.8 MPa, which was significantly less than that of the other six provenances such as B85, 17008 etc. The strength variance along the tree height was variety too. Therefore, in order to have the better effects on improvement on the longitudinal compressive strength of E. cloeziana, it should be selected on different individuals based on the provenances. There were no obvious correlations between the longitudinal compressive strength and the growth of tree height and diameter at breast height （DBH）, it could be improved independently. So we could improve on the growth and the longitudinal compressive strength of E. cloeziana at the same time.