Subjects: Biology >> Botany >> Applied botany submitted time 2023-07-26 Cooperative journals: 《广西植物》
Abstract： Shiwandashan is one of the hotspots of biodiversity in Guangxi, and its main vegetation type is the mountain evergreen broad-leaved forest. In order to understand the current community status and the development status of dominant species population structure of mountainous evergreen broad-leaved forests in the region; This study was conducted in a fixed monitoring sample plot of 1 hm2 established within the evergreen broad-leaved forest community in the Shiwandashan. Woody plants with a diameter at breast height ≥ 1 cm in the sample plot community were used as the research object to analyze their species composition, diameter class structure, tree height structure, and the spatial distribution pattern of dominant species using the g(r) function. The results indicate that: (1) There are 153 species of woody plants with a diameter at breast height ≥ 1 cm in the community, belonging to 52 families and 108 genera. The individual density of the sample plot community is 7 517 plants/hm2; The dominant species in the community are Clethra delavayi, Schima argentea, Hartia villosa, Castanopsis hystrix, Engelhardtia roxburghiana, Ardisia quinquegona, Itea chinensis, Symplocos adenophylla, Eurya subintegra, Ilex pubescens; But the dominant position of dominant species is not obvious. (2) The overall average diameter at breast height of the community is 5.51 cm, and the distribution of diameter class and tree height is approximately an inverted "J" shape. The diameter class distribution of dominant species is mostly an inverted "J" or "L" shape, and the community has a large number of small and medium-sized diameter class standing trees, indicating a strong self-renewal ability of the community. (3) Dominant species coexist stably in the community; The dominant species exhibit aggregated distribution in the sample plot, but there are differences in the location of aggregated distribution among dominant species. Overall, the community is currently in a good state of renewal, with the existence of dominant species in the top level community. However, the community has certain secondary characteristics and has not yet reached a stable top level community state. The dominant species can coexist stably and have the potential to inherit towards a stable top level community. Therefore, it is necessary to continue to strengthen management and promote the renewal and survival of the evergreen broad-leaved forest community in the Shiwandashan areas.
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