Population structure and dynamic characteristics of the endangered plant Trachycarpus nanus in different habitats

[ Objective ] The authors analyzed the population structure and dynamic characteristics in differ- ent habitats and explored the main influential factors , so as to provide basis for the protection , restora- tion , and renewal of the population in this area. [ Methods ] In order to understand the population structure and dynamic characteristics in different habitats , the static life table , survival curve , and survival analysis function curve of the population were drawn by investigating the population of the Trachycarpus nanus in three different habitats ( broad-leaved forest , mixed forest , and thicke ) in Dajianshan Nature Reserve of Chuxiong. Population dynamics were predicted by using the time series model. [ Results ] ( 1 ) In the three habitats , the population was in a declining state , and was sensitive to external interference. The survival curve was Deevey-Ⅲ type , and a large number of individuals died in the seedling stage. ( 2 ) In the three habitats , the distribution of T . nanus population was uneven and clustered , indicating that seed spreading of the T . nanus was centered around the mother plant. [ Conclusion ] The population density of T . nanus was the highest in the broad-leaved forest , followed by the mixed forest , and the smallest was shrub. Combined with the study on the population age structure , it was further proved that the broad-leaved for- est and the mixed forest with better water conditions were more conducive to the survival of the population.