Abstract: An investigation was conducted on the populations of Phellodendron amurense in Changbai Mountains of Northeast China. By the method of substituting time with space, and taking trunk size structure in place of age structure, an analysis was made on the age structure, static life table, and dynamics of the populations. In broad-leaved Korean pine forest, P. amurense population was maintained largely relying on the aging individuals, and was in short of the seedlings. In Betula platyphylla secondary forest, P. amurense population was relatively young but still with a seedling lack. The survive curves of the P. amurense populations in Changbai Mountains belonged to Deevey type III, showing a declining trend. The time series prediction for the populations indicated that with the decrease of old individuals after their transient increase, the P. amurense populations would be finally declined. It was suggested that appropriate artificial measures in considering of the endangered mechanisms should be adopted to ensure the continuous and steady growth of the P. amurense populations.

Key words: diversity index., alpine meadow, grazing disturbance