水杉年轮宽度和管胞形态径向变异研究

Radical variation in growth ring width and tracheid dimensions of Metasequoia glyptostrobides

关键词:  水杉  年轮宽度  晚材率  管胞长度  管胞壁厚

Key words:   Metasequoia glyptostrobides  growth ring width  latewood ratio  tracheid length  tracheid cell wall thickness

摘要:

采用木材切片法和光学显微技术,研究了四川省雅安市中里地区水杉木材年轮宽度和管胞的长度、壁厚、腔径等指标的径向变异。结果表明:(1)年轮宽度在髓心至第10年先迅速增加,然后呈下降趋势,速生期约15 a,晚材率低;(2)管胞长度随轮龄的增加而增大,13 a后增幅变缓,早材管胞长度小于晚材管胞,根据管胞长度判断实验水杉木材即将进入成熟期;(3)管胞宽度在轮龄10 a前增长迅速,幅度明显减慢,管胞宽度44.6 μm,壁厚7.23 μm,腔径37.48 μm,早、晚材间管胞宽度、壁厚、腔径差异显著;(4)管胞长宽比95.4、壁腔比0.27、腔径比0.82,水杉木材是优良的造纸原料。

Abstract:

Radical variation in growth ring width and tracheid dimensions of Metasequoia glyptostrobides planted in Yaan,Sichuan were evaluated. The results were as follows:the growth ring width first increased from pith to 10-year old,then decreased,and the main wood formation period was 15 a. The tracheid length of late wood was longer than that of early wood,and the tracheid length increased with the growth age,then decreased after 13-year old. The determined values for tracheid width,cell wall thickness,and lumen diameter were 44.6,7.23,37.48 μm,respectively,and significant difference in these index were found between early and late wood. Length to width ration(L/W),cell wall thickness to lumen diameter(2T/D),and lumen diameter to width(L/W)was 95.40,0.27 and 0.82,respectively. The results obtained in this study indicated that M. glyptostrobides wood was available for pulping.