杉木木材材性的遗传和变异研究——Ⅰ.材性性状的株内变异性及取样方法

<正>本文以12年生和28年生杉木(Cunninghamia lanceolata (Lamb.)Hook)人工林样木为材料,对材性性状的株内变异性进行了分析,结果表明:(1)在株内不同部位,木材密度和管胞长度存在着显著的变异性;(2)胸高部位上自髓心向外,木材密度(经苯-乙醇抽提后)和管胞长度迅速增大,至13～18年轮后大致趋向稳定;(3)对28年生和12年生的树木,抽提前后木材密度平均相差14.4％和4.5％,但抽提前后木材密度紧密相关。(4)幼龄(5,10,15年生)木材的密度和管胞长度,与成龄木材(28年生)的相应性状之间具有紧密相关性。

INHERITANCE AND VARIATION OF THE WOOD PROPERTIES OF CHINESE FIRI. ON WITHIN-TREE VARIATION AND SAMPLING METHOD IN WOOD PROPERTIES

The samples collected from the progenies of a 12-year-old open-pollinated seed orchard and the individuals of a 28-year-old plantation are studied in the paper. Results show as follows: 1) The within-tree variation in wood specific gravity (SG) and tracheid length (TL) is significant. 2) The giowth both in SG and TL from the pith at the breast height is rapid and stabilizes gradually 13-18 rings after. 3) The difference in SG is 14.4 percent for 28-year-old trees unextracted and extracted and 4.5 percent for 12-year-old trees, but SG is highly correlated to unextraction and extraction. 4 ) The correlation is high between related traits of 28-yebr-old wood.