林业科学2024，Vol.60Issue(1)：1-11,11.DOI:10.11707/j.1001-7488.LYKX20220401
中亚热带喀斯特森林树木功能型的生态位特征
Niche Characterization of Tree Functional Types in a Central Subtropical Karst Forest
摘要
Abstract
[Objective]By analyzing the niche characterization of tree functional types(TFTs)in a central subtropical karst forest,we can infer the differences in resource utilization and interspecific competition among different TFTs,providing theoretical guidance for vegetation restoration and reconstruction in karst areas.[Method]Based on plot surveys in the subtropical karst evergreen-deciduous broadleaved mixed forest in central subtropical China,the 40 tree species were selected and classified into different functional types according to canopy height,population size,shade tolerance,and seed dispersal mode.The niche characterization of the tree species in different functional types were analyzed by measuring niche breadth and niche overlap index.[Result]The niche breadths of tree species in the karst forest are generally low,with the ranking of common species>occasional species>rare species,and there are significant differences among them.The niche breadths of gravity dispersed species are significantly lower than those of animal dispersed and wind dispersed species,while there are no significant differences in niche breadths between different TFTs with different shade tolerance and canopy height.The niche overlaps among the 40 tree species are also low,with significantly higher overlap between common species compared to occasional and rare species,and significantly higher overlap for overstory species compared to understory species.Light demanding species have significantly higher overlaps compared to shade tolerant species,while gravity dispersed species have significantly lower overlaps compared to animal dispersed and wind dispersed species.The overlaps between common and occasional species are significantly higher than those between common and rare species,as well as those between occasional and rare species.The overlaps between animal dispersed and wind dispersed species are significantly higher than those between animal dispersed and gravity dispersed species,as well as those between wind dispersed and gravity dispersed species.However,the overlaps between mid-tolerant and shade tolerant species are significantly lower than those between light demanding and mid-tolerant species,as well as those between light demanding and shade-tolerant species.[Conclusion]Most tree species in the subtropical karst evergreen and deciduous broad-leaved mixed forest occupy relatively small niche spaces and may have lower interspecific competition.The differences in niche breadth and overlap among different TFTs may be closely related to habitat heterogeneity and species trait differences.When conducting vegetation restoration in degraded habitats,the composition and structure of the community should be reasonably constructed based on the niche characterization of different TFTs,thereby promoting recovery of forest vegetation.关键词
喀斯特森林/树木功能型/生态位宽度/生态位重叠/物种共存Key words
karst forest/tree functional type/niche breadth/niche overlap/species coexistence分类
农业科技引用本文复制引用
胡刚,庞庆玲,胡聪,徐超昊,张忠华..中亚热带喀斯特森林树木功能型的生态位特征[J].林业科学,2024,60(1):1-11,11.基金项目
广西自然科学基金项目(2021GXNSFFA196005,2021GXNSFAA196024,桂科AD21075023) （2021GXNSFFA196005,2021GXNSFAA196024,桂科AD21075023）
国家自然科学基金项目(31960275,31760128,42107371). （31960275,31760128,42107371）
