长江滩地杨木纤维形态特征及径向变异

Fiber morphological features and the radial variation patterns of poplar grown on the riverside of Yangtze river

对安庆段长江滩地I-72杨的纤维形态特征及径向变异模式进行了研究。结果表明:I-72杨的纤维长度平均值为1.30 mm,纤维宽度平均值为22.60μm,纤维长宽比平均值为57.43,纤维双壁厚平均值为6.35μm,纤维壁腔比的平均值为0.40。I-72杨的纤维长度、宽度、长宽比、双壁厚及壁腔比的径向变异规律相似,自髓心向外逐渐增加,到一定年限达到最大值以后趋于稳定。其中纤维长度、长宽比及双壁厚的径向变异均呈y=b0xb1分布,纤维宽度和壁腔比的变化幅度不大。安庆段长江滩地I-72杨的纤维长度、宽度和双壁厚均比前人研究的滩地杨木I-72、I-69及非滩地杨木I-69低。

The fiber morphological features and the radial variation patterns of poplar I-72 （ Populus x euramericana Guineir ＇San Martino＇ I-72）grown on the Yangtze riverside along Anqing city were studied. The main results are： the average fiber length of poplar 72 is 1.30 mm; the fiber width is 22.60 μm; the ratio of fiber length to width is 57.43 ; the double wall thickness is 6.35 μm; the ratio of double wall thickness to lumen is 0.40. The radial variation patterns of fiber length, width, the ratio of fiber length to width, double wall thickness and the ratio of double wail thickness to lumen are similar to each other. That is increasing year after year from pith outward untill reaching the maximum at a certain year and then tending to be stable. The mathematical model of the radial variation of fiber length, the ratio of fiber length to width and double wall thickness is y = b0xb1 , while variations of the fiber width and the ratio of double wall thickness to lumen are not large. Comparing with poplar 72 and poplar 69 grown on riverside and poplar 69 which is not grown on riverside, the fiber length, width and the double wall thickness are all lower.