【摘要】 大叶相思是热带地区的优良速生用材树种,本世纪六十年代初引入广东,经多年扩种,目前已得到巨大发展。本文通过对湛江地区3株10年生大叶相思的木材解剖和物理力学性试验,测出其纤维形态数值及各解剖特征的水平和垂直变异规律,并将大叶相思茎干与枝椏材之间有关特征作了比较。试验结果表明,大叶相思木材具有中等的密度和强度,而收缩变形极小。大叶相思的木纤维长度中等(993微米),纤维率较高(80.7％);纤维长度的水平变异,由髓向外纤维长度增加,最大值在9年生的年轮处;垂直变异,纤维长由基部向上增加,1.3～3.0米处纤维最长,近树梢处最短。枝材与干材比较,前者纤维长度略短,纤维壁厚稍薄,腔径稍大;枝材的纤维率略低,而导管率较高,但差异均不超过5％。大叶相思原木是优良的家具用材,亦可作室内装饰和细木工用材使用。大叶相思枝干材性质差异不大,是优良的制浆造纸原材料。更多还原

【Abstract】 Acacia auriculiformis is such an excellent tree that grows quick in the tropical area. Since it was introduced into Guangdong province in early 1960s , it has been developed into one of the important trees for forestation in South China especially in the past ten years.This article made a study on the wood properties of three A. auriculiformis trees of ten years old in order to make sure of the physico-mechanical and anatomical characteristics of the wood and of the regular patterns of their variations in the trunks and the branches at different positions.The results of the study show that A. auricuUJormis has a wood of moderate density and strength, comparatively high hardness and toughness , very low shrinkage mass and extremely high stability in dimensions. As regards the fibre dimension and its variations, the pattern is as follows, the fibre length is medium (993 urn) t the fibre percentage is relatively high (80.7%); the fibre length increases rapidly outwards from the pith with the maximum length at the ninth annual ring at a given height) at different heights, the fibre length in a given growth increment in the trunk increases upwards from the base with the maximum length at the section from 1.3 meter to 3 meters and with the minimum length near the top. The comparison of the wood in the trunk with that in the branch shows that the fibre length in the latter is slightly shorter,the cell wall is thinner and the fibre percentage is lower. The differences, however, are very little ,below 5 %.Consequently, the solid wood of A . auriculiformis is an excellent timber for furniture, and a good material for interior fittings and other joineries . While on the other hand, the wood in the branch as good as in the trunk is suitable for pulp and paper making.更多还原