作　　者： ; ; ; ; ; ; ; ; ; (林军）;

机构地区： 北京林业大学生物科学与技术学院

出　　处： 《西南林业大学学报（自然科学）》 2016年第2期78-83,共6页

摘　　要： 对广东省乐昌市龙山林场杉木基因库中272个10年生杉木无性系的树高、胸径、树皮厚、单株材积4个生长性状,心材比、木材基本密度等2个材质性状进行测定分析。结果表明：272个杉木无性系间存在丰富的表型变异,表型变异系数均〉10%;以单株材积变异系数最大,为69.04%,遗传变异系数为73.97%,变异幅度0.003 8~0.479 1 m3。6个重要性状在无性系间均表现为极显著差异,表明所测各性状均受较强的遗传控制。遗传相关系数和表型相关系数均是材积最高;密度遗传变异系数最低,为13.03%,重复力属中上水平（0.684 3）,仅心材比的重复力低于0.5。在10%、20%、30%和50%不同入选率下计算,所测性状遗传增益值均随入选比例的增大而降低。树高、胸径、树皮厚、材积4个生长性状间呈显著正相关,且均与木材基本密度呈极显著负相关。 272 ten years old of Chinese fir clones at Longshan farm, Lechang city of Guangdong provenance, 4 phenotypic traits including tree height, diameter at breast height, bark thick, volume of timber, 2 wood property characteristics including the heartwood ratio and density of wood were investigated. The results showed that there were abundant phenotypic variation in 272 clones. The phenotypic variation coefficient were all above 10%, of which, volume of timbre~ was the biggest. The volume ranged fi＇om 0. 003 8 m3 to 0. 479 1 m3 with the phenotypic and genetic variation coefficient was 69.04% and 73.97%, respectively. Very significant difference among clones of 6 measured traits and there were all variance component in clones which suggested a genetic control of them. Further study found that the variation tendency of genetic variation coefficient followed the phenotypic variation coef- ficient. The density presented the lowest genetic variation coefficient of 13.03%, while had a relative high repeat- ability value （0. 684 3 ） and only the heartwood ratio was lower than 0.5. All the measured traits, the absolute ge-netic gain increased under lower selection ratio （10% , growth traits showed a significant relation between each to wood basic density. 20%, 30% and 50% ）. Among the 6 phenotypic traits, 4 other and all were significantly negative correlation related

关 键 词： 杉木 无性系 变异 生长性状 材质性状

领　　域： [农业科学] [农业科学]