Combination selection of excellent families and plus trees of Pinus tabulaeformis

By means of halfsib progency test on 45 families of Pinus tabulaeformis,8 excellent families were selected whose average height,breast diameter and volume increased by 18.3%,28.4% and 91.7% with 12.8%,11.9% and 30.9% of genetic gains respectively.44plus tree were further selected from the excellent families with increases of 29.9%,36.9% and 128% in average height,breast diameter and volume,and their expectant genetic gains of 11.7%,15.4% and 43.2% respectively.The excellent individual selected can be used in building seed orchard of higher generation.