杉木大径材优树选择与主要经济性状变异分析

以胸径为选择指标，对杉木初级种子园23年生子代林大径材优树（胸径≥26cm）进行选择，共有38个优良单株入选，结果表明：优树胸径现实增益值均超过56％；树高、胸径、单株材积、树皮比率、木材基本密度和木材吸水性等主要经济性状在优树间变异较为广泛，变异系数在10％以上；树高、胸径、单株材积、木材吸水性间呈正相关关系，且达显著或极显著水平，而树皮比率与胸径及单株材积间、木材基本密度与各生长性状及木材吸水性间则为负相关关系，达显著或极显著水平。对大径材优树有效材积（去皮后单株材积）一木材基本密度类型作初步划分发现，共17株优树有效材积值大于优树群体均值，其中优树S14、S18、S22、S25木材基本密度大于优树群体均值。

Selection of Large-Sized Cunninghamia lanceolata Superior Trees and Variation Analysis on the Major Economic Traits

Taking DBH as selection index, 38 superior Cunninghamia lanceolata individuals （DBH ≥26cm） were selected from 23yr old progeny plantation inside the primary seed orchard. The realized-gain of DBH of all the superior individuals was all over 56%. Further analysis revealed that the tested economic traits including height, DBH, standing volume, bark ratio （BR）, wood basic density （DEN） and wood hygroscopicity （WH） varied greatly among the superior trees, and the variation coefficient was over 10%. It was also found that the height, DBH, volume, and WH were positively correlated to each other significantly or extremely significantly （ significance 〈0.05 or 0.01 ） among the superior trees, while there were significant or extremely significant negative correla- tions between BR and DBH, standing volume, between DEN and WH and each growth index. According to the classification results of the superior trees in VB （volume without bark） and DEN, 17 individuals were identified to have a higher level of VB than that of the mean value of the superior trees population （ PM）, and the DEN value of superior S14, S18, S22, S25 trees displayed a relatively high level than that of PM.