Abstract: Ormosia hosiei is a native endangered plant in China, the characteristics of many populations have been largely altered by increasing human activities. We used age-diameter relationships to study the age structures, and built the life tables, the survival curves, killing power value curves and mortality rate curves of three O.hosiei populations. In the heavily disturbed population, there was a declining population; the population , which was disturbed recently, had many young-aged individuals, accounting for 78.77% of the total individuals. The survival curves of three populations were characterized by high death rates of young-aged individuals. The age structure of the long-term exposure to less disturbed population was stable with sufficient numbers of young-aged individuals. For the life tables, the death rates of the age class Ⅰ and Ⅱ were negative with a shortage of young-aged individuals. The age structure and dynamics of three populations were similar to those of the other endangered species in China. Compared with ten years ago, the resources of O.hosiei was reduced. Therefore, more attention should be paid for the conservation of this species, the on-site conservation and off-site preservation methods should be combined, and strengthening the scientific research to promote the population development in the successive progressive direction.

Key words: Ormosia hosiei, disturbance, quantitative characteristics, population life table, survival curve