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作 者 ：潘惠新 黄敏仁 阮锡根 王明庥

期 刊 ：林业科学 1998年 34卷 1期 页码：73-80

关键词：美洲黑杨×小叶杨；木材密度性状；早期选择；

Keywords:Populus deltoides×P.simonii, Wood density property, Early selection,

摘 要 ：在美洲黑杨×小叶杨新无性系木材密度性状遗传变异及相关分析的基础上,开展木材密度性状幼-成相关及早期选择研究。单性状总平均木材密度(ρ_c)最佳早期选择林龄为5～6年,早期选择的遗传增益为8.72%～9.71%,早期选择的年效率为152.17%～141.30%。多性状指数法早期选择的最适林龄为第5年;构建指数的主要性状为总平均木材密度(ρ_c)、年轮密度(ρ_r)及早材密度(ρ_e)等3个木材密度性状;在第5年应用最佳选择指数I=2.2791ρ_c+11088ρ_r+1.1589ρ_e进行选择时(i=2.06),早期选择的遗传增益为0.1142g/cm³,比成熟期第10年单性状直接选择的遗传增益高151.65%。

Abstract:In this paper it is reported that the result of early selection for increasing wood density was obtained based on the genetic variation and juvenilemature correlative analysis in new poplar clones of Populus deltoides×P.simonii. The result showed that the stage from 5th to 6th tree age is better for early selection than other tree ages; at the 5～6th tree age, the genetic gains of early selection is about 8.72%～9.71% and the annual selective efficiency about 141.30%～152.17%. The best stage selected by early selective indexes formed with two or more traits at fifth tree age. The main properties formed indexes for increasing wood density include whole average wood density (ρ_c), annual ring density (ρ_r) and earlywood density (ρ_e). Selected by the best early selective index I=2.2791(ρ_c)+1.1088(ρ_r)+1.1589(ρ_e)(i=2.06) at the tree age of 5, the genetic gain of wood density was about 0.1142g/cm³ and 151.65% higher than the result selected by only direct whole average wood density at mature age of 10.

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