Abstract:

In this paper the genetic variations of ring density component traits of new clones in Populus deltoides×P. simonii were studied. The results show that each trait value of ring density components is obviously different among the clones. The broad heritability of ring density, earlywood density, minimum wood density, maximum wood density and gradient of wood density were high (h²=0. 41-0. 58);but the broad heritability of latewood density, latewood density/earlywood density and variation range of wood density were low (h²=0. 15-0. 25). At different ages the broad heritability of same trait was different.

Key words: Monochromical soft X-ray densitometer, New clones, Ring density components, Genetic parameter