Population structure and dynamic characteristics of endangered plant Firmiana pulcherrima in Diaoluo Mountain of Hainan Province

Subjects: Biology >> Botany >> Applied botany submitted time 2024-04-17 Cooperative journals: 《广西植物》

GUI Huiying FANG Fazhi LI Zhaojia ZHANG Xiaofeng MAI Youzhuan

Abstract： Firmiana pulcherrima is not only an endemic species in China but also a national grade second-level key protected plant. It is naturally distributed in the tropical rainforest area of central Hainan. To explore the survival status, development trend and the main reasons for its endangerment of the population, this paper conducted a field investigation on the natural population of F. pulcherrima in Diaoluo Mountain. The age-class structure of the population was constructed by replacing time with space. The population structure characteristics and dynamic change rules were analyzed through methods such as static life table and dynamic quantitative analysis, and the future development potential of the population was predicted by time series model. The results were as follows: (1) The population of F. pulcherrima was a growing type. The number dynamic index of entire population structure when ignoring external interference Vpi is greater than the number dynamic index of entire population structure when considering external interference V′pi, and both are greater than 0. The maximum risk probability of population to completely random disturbance Pmax was 1.82%. The population has a complete age structure, weak anti-interference ability, poor growth and stability. (2)The life expectancy of the population reached the maximum at the second age class, and then decreased with the increase of age class. Mortality and vanish rates peaked at age I, VII and IX. The survival curve was Deevey-III type. (3)Survival analysis showed that the population decreased sharply in the early stage and tended to be stable in the mid-late stages. (4)After 3,6 and 9 age classes in the future, the number of individuals in the remaining age classes increased except for the IV and VIII age classes. The population has strong natural regeneration ability. Consequently, strong light environment screening and interspecific competition are the main reasons for the endangerment of F. pulcherrima. It is suggested to take measures such as moderately thinning and pruning, strengthening population and habitat protection, actively carrying out artificial breeding and returning population expansion to promote the growth and recovery of the population.

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