细叶桉和赤桉种源间材性变异研究

A Study on Wood Property Variation between Eucalyptus tereticornis and Eucalyptus camalduensis

对海南岛乐东尖峰岭和琼海上土甬的 8年生细叶桉和赤桉共 15个种源 (含刚果 12号桉 )的木材进行了基本密度、纤维长度和宽度测定及分析。结果表明 ,两树种的基本密度及纤维长度在种源间均表现出显著差异 ,纤维宽度差异较小 ,变异大小排序 :木材纤维长度 >基本密度 >纤维宽度。赤桉的基本密度和纤维长度值较细叶桉更易受环境影响。不同种源的树皮厚度差异显著 ,不同方位间的树皮厚度有差异 ,北向最厚。种源间不同取样等分对纤维长度影响极显著 ,径向距髓心越远的取样部位纤维长度值越大。经综合比较 ,细叶桉 13544、14 4 2 4和赤桉 12 187、14 917、14

Fifteen provenances of 8 year old Eucalyptus tereticornis and E.camalduensis were collected from Ledong County and Qionghai City in Hainan Island.The fiber length,fiber width and basic density were measured and analyzed.The results showed that there were significant differences on fiber length and basic density between the two species.The variation range was in the following order:fiber length>basic density>fiber width.The environment factors had more influence on the basic density and fiber length of E.camalduensis compared with E.tereticornis. There existed significant differences in bark thickness among different provenances.The bark thickness varied with the directions.The bark thickness was the thickest in the direction toward the north.The fiber length would increase obviously from the pith to outside.By comprehensive comparison, E.tereticornis 13544,14424 and E.camalduensis 12187,14917 and 14918 were proved to be the provenances fine both in growth characters and wood properties.