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10年生桉树无性系木材干缩性能研究
Study on dry shrinkage property of 10-year-old Eucalyptus Clones wood
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摘要: 以广西国有东门林场6个10年生桉树无性系木材为研究对象,按照国家标准测定气干(弦向、径向、差异、体积)干缩率、全干(弦向、径向、差异、体积)干缩率,分析不同无性系间及不同树高部位干缩性能的变异规律及相关性。结果表明:气干和全干2种状态下的弦向、径向、体积和差异干缩率均存在极显著差异,干缩率性状沿树干高度向上变异趋势不一致,一元线性回归分析显示干缩率之间呈正相关关系,桉树无性系木材差异干缩程度为2~3级,属于干缩率中等的树种。14号无性系在气干与全干状态下的差异干缩最小,可培育为高质量家具用材。桉树无性系干缩性质差异显著,结果可为桉树新品种创制和材性改良提供参考。Abstract: The variation of wood drying shrinkage property of 6 10-year-old Eucalyptus clones was studied to provide the basis for breeding of E. clones and wood processing and utilization. According to the national standard, the dry shrinkage rate of air-dried(tangential, radial, differential, volume) and oven-dried(tangential, radial, differential, volume) of 6 E. clones in Dongmen Forest Farm of Guangxi Province were measured.The variation and correlation of dry shrinkage property between different clones and tree height were analyzed.The results showed that there were significant differences(P<0.01) in tangential, radial, volume and differential dry shrinkage between air-dried and oven-dried. The variation trend of dry shrinkage was not consistent along the height of trunk, single linear regression analysis showed a positive correlation among dry shrinkage rate and the differential shrinkage of E. clones was 2~3 grades, which belonged to the moderate dry shrinkage species. The difference of dry shrinkage between air-dried and oven-dried clones of No. 14 was minimal, and it can be cultivated as high-quality solid wood for furniture.The dry shrinkage properties of E. clones were significantly different, which provides scientific basis for the creation of new eucalyptus varieties and the improvement of wood properties.