桢楠优良种源/家系苗期评价和选择研究

对从四川省 9 个县( 区) 收集的 44 个桢楠优株家系苗期生长指标进行测定和分析。采用嵌套式试验分析，结果表明，种源和家系间的苗高和地径均具有极显著差异。种源间苗高和地径变异系数分别在 0.23~0.42 和 0.15~0.28 之间，家系苗高和地径变异系数分别在 0.05~0.43 和 0.10~0.34 之间。以苗高、地径为评价指标，以改良后的布雷金多性症状综合评定法进行评定，初选出都 6、9 和 4 号 3 个优良种源，31、22、32、6 和 38 号 5 个优良家系。根据苗期生长数据的分布，部分桢楠优株家系已表现出生长优势，具有进一步筛选的潜力。Seedling growth indices of 44 superior plus-tree families of Phoebe zhennan, collected from 9 counties (districts) in Sichuan Province, were measured and analyzed. A nested experimental design was adopted, and the results revealed highly significant differences in seedling height and basal diameter between provenances and families. The coefficients of variation (CV) of seedling height and basal diameter among provenances ranged from 0.23 to 0.42 and from 0.15 to 0.28, respectively, while those among families ranged from 0.05 to 0.43 and from 0.10 to 0.34, respectively. Using seedling height and basal diameter as evaluation indices and the modified Brekhman multi-trait comprehensive evaluation method, three superior provenances (No. 6, No. 9 and No. 4) and five superior families (No. 31, No. 22, No. 32, No. 6 and No. 38) were preliminarily selected. Based on the distribution of seedling growth data, some superior plus-tree families of Phoebe zhennan have exhibited growth advantages and hold potential for further screening.