Population Structure and Quantitative Dynamics of Rare and Endangered Plant Paphiopedilum purpuratum

Abstract:

Sample quadrat survey was conducted on Paphiopedilum purpuratum in Baixi Provincial Nature Reserve of Zijin County, Heyuan City, Guangdong Province. The dynamic changes of the planting stages of population of P. purpuratum were studied by using population life table, survival curve table, survival function value and time series prediction analysis method. Quantitative dynamics and variation of plants. The results showed that seedling was the dominant species, approximately 54.73% of the population, and the age structure was stable. The dynamic index V_pi of population age structure was 0.33, V_pi' was 0.07. Both dynamic indices were more than 0, the survival curve type is closer to Deevey-Ⅱ,indicating that the population was stable at present. Both of them while the cumulative mortality and risk function increase, survival function decreases, and death density function fluctuates greatly. The time sequence prediction analysis shows that P. purpuratum has a certain recovery ability, but the overall population increased with time, the adult plants gradually increased, and the seedlings decreased. The average flowering and seed setting rate of P. purpuratum is only 16.94% and 3.29%. The seed has no endosperm and under nutrition, which makes it difficult to develop into a seedling in the nature, and propagation mainly by tillers, so it was very important for the protection of P. purpuratum seedlings.

Key words:Paphiopedilum purpuratum;Population structure;Quantitative dynamics;Age class;Rare and endangered plant