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对嫁接 7年生的杉木 1 .5代种子园无性系球果进行年龄段分布调查 ,结果表明 :(1 )杉木种子园母树球果分布较为密集的是Ⅲ、Ⅳ、Ⅴ和Ⅵ 4个年龄段 ,占 7个年龄段总球果数的 78.8% ,其中Ⅳ年龄段结实量最多 ,其着果比例为 2 3.2 %。 (2 )杉木无性系年龄段着果量变异由无性系的遗传因素和种子园的地理环境因素综合作用所致。平均变异系数无性系间为5 3.7% (38.9%~ 75 .2 % ) ,无性系内分株间为 5 9.2 % (6 .7%~ 1 41 .2 % )。无性系间、无性系内分株间的年龄段着果数均存在较大变异 ,但从平均变异系数来看 ,两者的变异幅度相差不大。 (3)结实量多的无性系分株在各年龄段着果多 ,特别是下部年龄段着果多 ,而且所占比例相近。
The results showed that: (1) The distribution of Pinus arboricola in Pinus densiflora seedlings was more intensive than that in Ⅲ, Ⅳ, Ⅴ and Ⅵ , Accounting for 78.8% of the total number of fruit in 7 age groups. Among them, the highest in Ⅳ age group was fruiting, with a ratio of 22.2%. (2) The variation of fruit yield in the clonal age of Chinese fir was caused by the combination of the genetic factors of clones and the geographical environment of seed orchard. The mean coefficient of variation was 53.7% (38.9% -75.2%) in clones and 5 9.2% (6.7% -114.2%) in clonal ramets. Clonal and clonal ramets within the age group of fruit number there are large variations, but the average coefficient of variation point of view, the two differences in the magnitude of the difference is not large. (3) Clonal ramines with more sturdiness had more fruits in all ages, especially those in the lower age group, with similar proportions.