杉木第一代改良种子园接株产量变异及其构成因素分析

Analysis on Seed Yield Variety of Grafting individual and Its Constituent Factors in First Generation Seed Orchard of Chinese Fir

通过杉木第一代改良种子园45个优良无性系调查结果表明：无性系间单株产量达到极显著水准，遗传方差份量占总变异的37．77％，可见杉木种子园产量很大程度上受到遗传性的制约．在参试的45个无性系中，高产无性系占20％，产量占总产的42．02％，单株产量构成的直接因素为单株果量和单果出籽量，间接效应为雌雄花量．

45 superior clones in first generation seed orchard are investigated in this paper. The results areas follows: The differences of individual seed yield among the different clones are significant. The geneticvariance accounts for 37. 77 % of total variety. It shows that seed yield in seed orchard of Chinese fir dependson heredity to a great extent. Among 45 testing clones, the clones of highyield account for 20%, their seedyields account for 42. 02%. The direct factors of individual seed yield contituent are cone quantity of individualtree and seed quantity per a cone. Their indirect factors are flower quantities of male and female.