Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2022, Vol. 43 ›› Issue (12): 2614-2625.DOI: 10.3969/j.issn.1000-2561.2022.12.024

• Agricultural Ecology & Environmental Protection • Previous Articles    

Niche of Dominant Plant Populations of Acacia confusa Community in Pingtan Island

MA Xiaodi1, JIANG Degang2, LIU Zilin1, WANG Fang1, WEN Ruilong1, DENG Chuanyuan1,*()   

  1. 1. College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
    2. Island Research Center, Ministry of Natural Resources, Fuzhou, Fujian 350400, China
  • Received:2022-03-09 Revised:2022-04-09 Online:2022-12-25 Published:2023-01-12
  • Contact: DENG Chuanyuan


Acacia confusa is the main construction species of Acacia forest, it’s an excellent afforestation broad-leaved tree species in Pingtan Island. Understanding the niche characteristics of the main woody and herbaceous plants population is helpful to understand the coexistence and competition mechanism of species in island community. We investigated A. confusa communities in Pingtan of its inner and subsidiary islands, Levins and Shannon niche breadth and Pianka niche overlap indexes were used to analyze the ecological niche of the main species in the woody layers and herb layers of A. confusa communities in Pingtan Island. A total of 144 species of vascular plants belonging to 123 genera and 63 families were found, mainly Gramineae and Compositae, significantly different from continental vegetation types. 14 species of invasive plants include Praxelis clematidea, Bidens Pilosa and Erigeron bonariensi were found in the community, which occupied a large niche in the community and may cause some ecological disturbance to the symbiotic population. A. confusa and Casuarina equisetifolia in the tree layer, Sageretia thea and A. confusa in the shrub layer, and Miscanthus sinensis and Praxelis clematidea in the herb layer had higher niche breadth than other species. Species with niche breadth less than 0.5 accounted for 96.67% of the total. The niche breadth of species with higher importance values were generally larger, but not entirely consistent. The niche overlap of dominant population was herb layer (0.253) > shrub layer (0.231) > tree layer (0.149), all smaller than 0.3. The niche overlap between the main species in the community was generally lower, niche differentiation weakened interspecific competition. The strong environmental filterability in the Island led to different degrees of habitat differentiation of the population. The population concentrated in local habitats by narrowing niche breadth, thus promoting the coexistence of species in the island community. The A. confusa community on Pingtan Island was the top zonal community with stable interspecific relationship and slow population regeneration.

Key words: Pingtan Island, Acacia confusa, niche breadth, niche overlap

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