<正>以杉木无性系着生球果的树冠表面积占树冠总表面积的比例为结实系数 ,对安徽、福建、广东三省的 73个杉木种子园无性系进行了结实遗传变异的研究。结果表明 ,杉木无性系间结实系数差异极显著 ,基因型方差分量达 33.48%～ 61 .0 5 % ;对结实系数重复力估算得出单株为 0 .335～ 0 .61 1 ,无性系为 0 .60 2～ 0 .82 5 ,说明结实系数指标受中上等遗传控制 ,利用结实系数作为评价结实性状的指标 ,可有效地进行无性系再选择

This paper studied the heredity variation of seed bearing coefficient.The statistic data were collected from 73 Cunninghamia lanceolata (Lamb.)Hook.seed orchards clones located in Anhui,Fujian and Guangdong(SBC was represented by the ration of tree crown superficial area with cone to total tree crown puperficial area).The results indicated:the difference of SBC among the 73 clones is very significant,interms of genotype variance componemt,in SBC take 33.48%～61.05% of the total varianc and SBC repeatability of the single tree is 0.335～0.611 and of the clones is 0.602～0.825,which indicates that SBC is controlled by moderate genetic controlling and these clones can be reselected efficiently by using SBC as a standard of the seed productivity.