关键词: 苦树, 群落类型, Shannon-Wiener指数, Margalef指数, Pielou指数

Abstract: A sample plot survey was used to investigate the communities of Picrasma quassioides, and the habitat characteristics, species composition, floristic composition and species diversity were analyzed. The results showed that 255 species in 207 genera and 85 families of vascular plants were found in 10 plots, and there are abundant species in the P. quassioides community. The main dominant families were Euphorbiaceae, Fabaceae, Gramineae, Moraceae, etc. The floristic types of seed plants in the community were divided into 14 types, with pantropic and tropical Asian elements as the main components, with tropical elements accounting for 72.73% of the total genera, and the community had obvious tropical properties. The community was divided into four types. P. quassioides grew vigorously in community Ⅱ and community Ⅳ, and was the dominant species in the tree layer. Community Ⅱ and community Ⅳ were the ideal habitat. The Margalef index, Shannon Wiener index and Pielou index showed that the shrub layer was larger than the tree layer. The three diversity indexes of tree and shrub layer in community Ⅱ were the highest, while Margalef species richness index of tree layer in community Ⅳ was the higher, while Shannon-Wiener diversity index was the lowest. The root budbreak ability of P. quassioides is stubborn, and the closure measures have positive significance for the restoration of P. quassioides population. The results can provide basic information for the protection and cultivation of P. quassioides resources.