毛泡桐种源育种值早期预测的研究

以２６个毛泡桐种源为材料，对树高，胸径，干高，直径和材积的育种作了直接和间接预测。结果表明，毛泡桐种源１－２年生时的胸径能够可靠地预测９年生各观测性状的育种值；对１年生胸径育种值作早期选择时，选择强度以０．８０较好，此时，胸径，树高，干高，直径及材积的直接或间接相对选择效率分别达到了７９．７１％，８１．８３％，５６．７７％，７５．０７％和７６．２０％，年均选择效率分别是３９８．５７％，４０９．１３

Study on the Early Prediction of Breeding Value for Paulownia tomentosa

? year old height,diameter of breast height ( DBH ),stem height ( SH ),diameter of half height ( DHH ) and volume were measured for 26 Paulownia tomentosa provenances,and the breeding values of those traits were predicted directly or indirectly.The results showed that the breeding values of the characteristics measured at age 9 might be precisely predicted by DBH observed in the early stage.When DBH was used at age one with selection intensity of 0.80,the direct and indirect selection efficiencies reached to 79.71%,81.83%,56.77%,75.07% and 76.20% for height, DBH,SH,DHH and volume at the age of 9 respectively.Furthermore,the selection efficiencies per year were 398.57%,409.13%,283.84%,375.35% and 381.01% for the traits correspondingly.Therefore,the early selection for Paulownia tomentosa provenance should conducted in the early stage with less intensity.