Species Composition and Diversity of Fagus longipetiolata in Leigong Mountain, Guizhou Province

[Objectives] To understand the species composition and diversity of Fagus longipetiolata community. [Methods] The F. longipetiolata community in Guizhou Province was investigated by typical plot method. [Results] There were 107 species of vascular plants belonging to 79 genera and 51 families in Leigong Mountain F. longipetiolata community, including 3 species of pteridophytes belonging to 3 genera and 3 families, 104 species of spermatophytes belonging to 76 genera and 48 families, including 3 species of gymnosperms belonging to 3 genera and 3 families, and 101 species of angiosperms belonging to 73 genera and 45 families. The types of Leigong Mountain F. longipetiolata community were divided into 7 formations, and the top 10 important species of each formation were Fagaceae, followed by Lauraceae and Ericaceae. The change trend of tree layer richness index was formation I >formation IV >formation VI >formation III >formation VII >formation II >formation V; the dominance index was formation I >formation IV >formation V >formation VI >formation VII >formation III >formation II; H diversity index was formation V >formation II >formation I >formation III >formation VII >formation VI >formation IV; the evenness index is formation II >formation III >formation VI >formation VII >formation IV >formation I >formation V; the total diversity index of the community, formation I (3.67) was the highest, formation V (2.74) was the lowest, manifested as formation I >formation III >formation VI >formation II >formation IV >formation VII >formation V. [Conclusions] The community stability is closely related to its species composition, and the background species is the basis for the survival of the community; the existence of rare species can further enhance the community diversity index and enhance the community stability.