Numeric dynamics of wild population of Cycas fairylakea mainly distributed in Shenzhen City were studied using the static life table,the survival curve,the fecundity schedule and the Leslie matrix model.The viability of the population was analyzed by viability functions.Analytical results from the life table and survival curve reflected that Cycas fairylakea underwent very strong environmental screening during classⅠ(0~15a) and competitive self-thinning,human excavation at the classⅤVandⅥ(61-75a,76-90a).The...