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０成相关及早期选择研究。单性状总平均木材密度最佳早期选择林为５－６年，早期选择 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、年轮密度及早材密度等３人木材密度性状；在第５年应用最佳选择指数Ｉ＝２．２７９１ρＣ＋１．
お? In this paper it is reported that the result of early selection for increasing wood density was obtained based on the genetic variation and juvenilemature 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 872%～971% and the annual selective efficiency about 14130%～15217%. 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 (ρc), annual ring density (ρr) and earlywood density (ρe). Selected by the best early selective index I=22791(ρc)+11088(ρr)+11589(ρe) (i=206) at the tree age of 5, the genetic gain of wood density was about 01142g/cm3 and 15165% higher than the result selected by only direct whole average wood density at mature age of 10.
出处
《林业科学》
EI
CAS
CSCD
北大核心
1998年第1期73-80,共8页
Scientia Silvae Sinicae
