杂交鹅掌楸木材解剖性质及其径向变异规律

Wood Anatomical Properties and Its Radial Variation of Liriodendron chinense×L.tulipifera

对4株24年生杂交鹅掌楸木材的解剖性质进行了研究。结果表明:杂交鹅掌楸木材导管平均数66个/mm2,导管平均直径 57μm,导管分子平均长度 647μm;生长轮宽 1. 72 ~ 11. 93 mm,纤维长 0. 80 ~1.74 mm,纤维宽20.9~31.6μm,纤维单壁厚5.13~5.49μm,纤维长宽比48.02~55.74,纤维壁腔比0.57~0.66,纤维微纤丝角6.62°~18.62°。纤维长度、宽度和长宽比自髓心向外随形成层年龄的增加而增大,至9~11年时趋于稳定;微纤丝角随形成层年龄递增而递增,至第 7 年时达到最大值,随后迅速递减,在 11 年左右趋于平缓。对4株杂交鹅掌楸在胸高处的木材解剖指标及微纤丝角等进行了有序分类,划分出杂交鹅掌楸幼龄材与成熟材的界限为9~11 a。

The wood anatomical properties of 24-years-old hybrid tulip(Liriodendron chinense×L.tulipifera) trees were studied.The results show: the average number of vessels is (66 per mm^2),the average diameter of vessels 57 μm,the average length of vessels (647 μm),the growth ring width 1.72～11.93 mm, the fiber length 0.80～1.74 mm,the diameter of fiber 20.9～31.6 μm,the thickness of single fiber wall 5.13～5.49 μm,the ratio of fiber length to width 48.02～55.74, the ratio of double wall thickness to lumen (0.57～)0.66,the microfibrillar angle of fiber 6.62°～18.62°。The radial variation laws of the hybrid tulip tree are as follows.The fiber length,width and ratio of fiber length to width fiber from pith to bark increase rapidly,tend to stabilization at the 9～11 year growth ring.The microfibrillar angle of fiber increases with the age of growth increment and reaches to the biggest at 7^(th) year.The annual ring,tends to stabilization at the 11^(th) year ring.The boundary between the juvenile and mature wood of the hybrid tulip tree is at the age of 9～11 years by the order cluster analysis to above anatomical properties.T-test indicated that there are significant differences between the anatomical properties of juvenile and mature wood.