海岸防风林中山杉木材生长特性

Research on the wood growth characteristics of Taxodium hybrid 'Zhongshansha 302' planted for coastal windbreak

研究了20年生海岸防风林中山杉302木材的生长特性,结果表明,单株平均材积为0.359 m3。生长轮平均宽度为8.12 mm,其径向变异为由髓心向外先增加后减小,随后趋于稳定。冬季休眠期立木生材含水率平均值为153.61%;其径向变异为由髓心向外逐渐减小,至边材向心材转化前1~2年,达到最低值,为59.44%;随后生材含水率逐渐增加,至树皮附近的2~3年趋于稳定。心材平均含水率是179.46%,边材平均含水率是127.79%。基本密度的径向变异为自髓心向外以抛物线状增加,基本密度与生长轮龄具有y=-0.000 4x2＋0.009 7x＋0.323 2的相关关系。

This paper deals with the wood growth characteristics of Taxodium hybrid ＇Zhongshansha 302＇ planted for coastal windbreak.The research showes that the average wood volume is 0.359 m3 per tree.The average growth ring width is 8.12 mm,its radial variation pattern is increaing at first and then decreasing outward and at last leveling off.The average moisture content of green wood is 153.61% in the winter dormant period.Its radial variation pattern is decreasing from pith outward,reaching the lowest value of 59.44% at the 1-2 years before the transition from heartwood to sapwood,then increasing outward and leveling off near the bark at last.The average moisture content of heartwood and sapwood are respectively 179.46% and 127.79%.The radial variation pattern of basic density increases as the parabola shape from pith to bark,the mathematical model is y=-0.000 4x2＋0.009 7x＋0.323 2.