Abstract: While carring out the cutting propagation of Picea koraiensis in different age,the endogenous plant hormones and nutrient elements in the cuttings have been measured.The results show that ①there is clear age effect in rooting ability of the cuttings.The rooting percent of the cuttings are gradually reducing along with the increase of the mother tree age.②It has significent correlative relationship between the rooting rate and endogenous plant hormones contents of the cuttings in different age.The higher the rooting rate of the cuttings is,The more the IAA and GA₄ contents in the cuttings.Conversely,this trend is reversed for ABA concentrations in the cuttings.③ The rooting rate of the cuttings is also influenced by nutrient level in the cuttings,especially N and K contents.The increase of the mother tree age is bound to follow a slight decrease of N and K contents in the cuttings.So dose the rooting rate of the cuttings.

Key words: Picea koraiensis, Cutting propagation, Age effect