杉木不同种质和林龄的木材管胞形态变异规律

Variation Pattern of Wood Tracheid Morphology at Different Germplasm and Stand Age of Chinese Fir

对广西杉木(Cunninghamia lancelata)良种及普通种8年、9年、10年、11年和16年生木材的管胞长度、管胞宽度、管胞长宽比、管胞双壁厚、管胞腔径比和管胞壁腔比进行了测定和分析。结果表明:杉木材性与林龄呈正相关,不同林龄之间其管胞长度、宽度、长宽比和双壁厚差异均显著,但良种杉木材的管胞腔径比和壁腔比无显著差异;良种杉木材性未随着生长量的快速增加而变差,8~11年生良种杉木的材性指标明显优于普通种,其木材利用率也相应高于同龄的普通种杉木材;10年生以后良种杉木的管胞形态综合评分处于中上水平,即使进行短周期经营其材性指标也符合相关加工利用参数要求。

The tracheid length, tracheid width, the ratio of tracheid length-width, tracheid double wall thickness, the ratio of tracheid cavity to width and the ratio of tracheid double wall thickness to cavity in Guangxi superior and common species of 8-year-old, 9-year-old, 10-year-old, 11-year-old and 16-year-old Chinese fir were measured and analyzed. The results showed that wood property was positively correlated with stand age. At different stand age, the difference of tracheid length, Tracheid width, the ratio of tracheid length-width, tracheid double wall thickness was significant; while there was no significant difference in the ratio of tracheid cavity to width and the ratio of tracheid double wall thickness to cavity in superior species. The wood property of Chinese fir superior species didn't get worse with the quick increase of growth. Wood traits of 8~11 years old superior species were much better than common species, the wood utilization ratio of superior species was higher than that of common species at the same stand age. After 10 years, comprehensive evaluation of wood tracheid morphology in Chinese fir superior species levels was medium-high, which showed that the short cycle operation of wood traits was also consistent with the requirements of the relevant processing parameters.