Genetic Analysis ofClonal Growth Traits in Gene-Pool of Black Popular

The growth of Populus deltoides and Populus×euramericana clones from thegene-pool in Changqing County,Shandong Province is studied. A significant variance is observed in growth among clones. The broad-sense heritability for DBH and height are higherfrom the fourth year on,and till the tenth year they remain above 0.7. There are differentcharactertstics of growth and genetic variation between P. deltoides and P. × euramericana. The growth in DBH and height at early stage of P.euramericana is superior to P. deltoides, till the tenth year, both are basically the same. Average heritability of DBH is higher thanthat of height for P. × euramericana, but it is contrary for P. deltoides. The growth for P. deltoides shows significant negative correlation to the original latitude.