LAUSR

Amur corktree (Phellodendron amurense) is a rare and endangered species in China. This paper takes the wild Phellodendron amurense population in Yanshan Mountains as the research object. We conduct comprehensive survey on Phellodendron amurense in eight reserves through typical sampling, establish a static life table and draw a population survival curve to analyze the age structure of the population, and use its population dynamic quantization and time series analysis to predict potential population changes. The results show that (1) the P. amurense population is by an large of an inverted J type. The dynamic change index under external interference is 1.017%, indicating that the population tends to be stable. (2) Analysis on the static life table and the population survival curve shows that the survival number of the P. amurense population increases along with the diameter scales as the individual number decreases, with the VII group at the top. The population survival rate belongs to the typical type of Deevey⁃II. The P. amurense population grows poorly in early age, stably in medium age period, and declines in old age. (3) Time series analysis indicates that, after more trees grow in the 2, 4, 6, 8 diameter scales in the future, the number of medium and old-aged trees in the population may increase gradually. The major factor for the endangering of the P. amurense population is its insufficient seedling regeneration and scattered tree distribution. Therefore, the paper concludes that seedling raising should be strengthened to increase the survival rate of the seedlings, and the living environment be protected and improved to enhance natural