关键词: 邓恩桉, 基本密度, 干缩特性, 回归模型

Abstract: Based on two provenances of Eucalyptus dunnii for measuring wood basic density,and checking radial and tangential dimension in green,air-dry and oven-dry states,the variation regulation of wood basic density and shrinkage ratio in different place of tree stem was studied,and the processing technology of reducing shrinkage and splitting measures (reconditioning treatment) was took to explore the restoration performance of shrinkage and splitting defects.The results indicated that:firstly,wood basic density of number 100 provenance (0.5265 g/cm³) was bigger than number 98 provenance (0.5360 g/cm³);Secondly,wood basic density showed corr change in longitudinal direction of tree stem,and sapwood density was significant higher than heartwood in traverse direction;Thirdly,wood shrinkage become smaller with the height of tree stem increasing,and sapwood shrinkage was remarkably higher than heartwood in traverse direction.Besides,tangential shrinkage ratio was 1 to 3 times more than of radial,both in longitudinal and traverse direction;Fourthly,wood splitting severity declined by reconditioning treatment,and the shrinkage recovery ratio of radial and tangential direction were 0.4% and 3.3% respectively;Eventually,wood basic density had extra significant correlation with tangential shrinkage of air-dry,and its correlation coefficient was-0.313,and linear regression models between shrinkage ratio of air-dry and oven-dry was also established.

Key words: Eucalyptus dunnii, basic density, shrinkage characteristics, regression model