大花序桉种源幼林木材力学性质研究

Study on Juvenile Wood' s Mechanical Properties of Eucalyptus cloeziana Provenances

通过对广西钦廉林场6年生的9个大花序桉种源木材力学性质进行测定,结果表明,种源间木材顺纹抗压强度、抗弯强度、抗弯弹性模量和抗剪强度差异极显著;4个力学指标群体均值分别为60.272 MPa、127.920 MPa、10.667 GPa、736.987 k N,均达到中等至高级水平;树高、胸径与4个力学指标间存在中等强度以下的负相关,但均未达到显著水平;4个力学指标的广义遗传力分别为0.72、0.79、0.72、0.47;木材综合品质系数为11 084.51×105Pa,属高等级材。大花序桉木材可作为承重结构和高中档家具用材,开发利用该木材作为结构用材,具有现实意义。

In Guangxi Qinlian Forest Farm,we selected six-year old Eucalyptus cloeziana from 9 prove-nances as material,analyzed the wood mechanical property.The result showed that differences of compressive strength parallel to grain,bending strength,modulus of elasticity and shear strength were significant among different provenances.The mean value of these four mechanical indexes were 60.272 MPa,127.920 MPa, 10.667 GPa and 736.987 kN,respectively,and all of them reached medium and high level. Tree height,di-ameter at breast height showed moderate-intensity negative correlations with four mechanical indexes,but they were not significant.The broad-sense heritability of four mechanical indexes was 0.72,0.79,0.72 and 0.47,respectively.Comprehensive quality factor of wood was 11 084.51 ×105 Pa,which belonged to high class wood.Wood of Eucalyptus cloeziana could be used as timber of bearing structure and medium and high class furniture.Therefore,developing and using wood of Eucalyptus cloeziana as structural timber has practical significance.