杉木种子园中无性系间结实和种子品质差异研究

在观察的31个无性系中丰产的约占20％,产量约占总产30％;中等的占60％弱,产量占54％;低产的占20％强,产量约占17％。结实的广义遗传力hw~2平均0.66。不同无性系在雌雄花比、雌花序结构、球果大小和分枝稠密度等方面存在差异。一般植株“偏雌性”、聚生雌花序占优势,球果大、树冠表面积大而分枝稠密的无性系结实量高;反之,“偏雄性”、单生雌花序为主、球果小、树冠表面积小而分枝稀疏的无性系结实量低。据72个无性系的分析,大粒种子无性系约占21％,中粒的约占47％,小粒的占32％;高发芽率无性系占23.6％,中发芽率的占57％,低发芽率的占19.4％。大粒种子无性系的发芽卒往往高于中、小粒种子无性系;而发芽势有相反趋势。

THE DIFFERENCES OF CONE-YIELD SEED QUALITY BETWEEN CLONES IN TWO SEED ORCHARDS OF CHINESE FIR

Among 31 clones of Cunninghamia lanceolata in two seed orchards, about 20% of clones are high-yielding, its yield making up approximately 30% of the total; mild-yielding clones are a little more than 20%, its yield accounting for 17%. The generalized heritability of cone-yield hw2=0.66, on the average. There are differences in male-female ratio, structure of female inflorescence, cone volume, density 癴 branching and surface area of crown among the clones. In general, the plant with "more female characters", clustering stobiles, big cones and large and dense crowns is high-yielding. According to the data of 72 clones, 21% clones have big seeds; 47% are of middle seeds and 32% are of small seeds, 24% clones are imbued with high germination pergentage; 57% with middle's and 19% with low's. The clones with big seeds has higher seed germination, percentage than others; but the seed germination energy has a tendency the otherway.