Species Biodiversity of Seven Typical Shrub Communities in the Middle of Guangxi Zhuang Autonomous Region

Abstract:

In order to understand the biodiversity characteristics of shrub communities in the middle of Guangxi, the species composition, floral, life-form and species biodiversity of seven typical shrub communities were investigated and analyzed. The results showed that there were 85 shrubs belonging to 37 families and 68 genera, and 74 herbs belonging to 35 families and 61 genera in the seven shrub communities. The shrub species were dominant by Euphorbiaceae and Leguminosae, which contained 10 and 9 species, accounting for 11.76% and 10.59% of the total shrub species, respectively. The herb species were dominant by Gramineae and Asteraceae, which contained 13 and 11 species, accounting for 17.57% and 14.87% of the total herb species, respectively. Among the seven shrub communities, Bauhinia championii community had the highest species richness, Shannon-Weiner, Simpson and Pielou indexes, followed by Mimosa sepiaria, Pterolobium punctatum, Rhodomyrtus tomentosa communities. The areal-type was dominant by Pantropical element accounting for 43.94%, and the phanerophytes was dominant in the life form accounting for 37.50%. Therefore, it was suggested that the tropical floral and life-form of shrub communities in middle Guangxi was stronger than temperate, and closed to the vegetation in southern subtropics.

Key words:Community;Biodiversity;Subtropical region;Flora;Guangxi