无性系杉木木材物理性质研究

Studies of the Physical Properties of Clone Chinese fir Wood

对金洞林场杉木无性系19年生(不含苗龄)的木材物理性质研究,结果表明:杉木优良无性系木材的基本密度、径向干缩率、弦向干缩率、体积干缩率分别是0.279 g.cm-3、2.90%、5.10%和7.85%;整个无性系的基本密度、径向干缩率、弦向干缩率、体积干缩率分别是0.301 g.cm-3、3.28%、5.26%和8.27%;而对照CK的基本密度、径向干缩木材基率、弦向干缩率、体积干缩率分别是0.275 g.cm-3、2.80%、5.10%和8.00%.研究证明:杉木优良无性系不但木材产量高,而且木材质量也并不比当地实生苗差.选用杉木优良无性系造林,不但能增加木材产量,而且材质也不会因速生而变劣.

Studies of the physical characteristics of the superior clone Chinese fir （19 years） （Cunninghamia lanceolata）, which grow in Jingdong Forest Farm, show that its basic density, dry shrinkage of radial, chordwise and volume are 0. 279 g · cm^-3, 2. 90%, 5. 10% and 7.85% respectively; those of the whole clone are respectively 0. 301 g · cm^-3, 3.28%, 5.26% and 8.27%; but those of the check-group CK are 0. 275 g · cm^-3, 2.80%, 5.10% and 8.00% respectively. The basic density of wood is an important index to indicate its strength and estimate its mechanical property or technique while the stability and flexibility of its dimension can be judged with the dry shrinkage of wood. The superior clone Chinese fir grows in jingdong Forest Farm not only with high output but also with better quality than seedling plants. In a word, timber output will be increased by choosing to grow the superior clone Chinese fir and＇its wood quality will not be inferior for its fast growth.