Study on the Early Prediction of Breeding Value for Paulownia tomentosa

1~9-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.