深圳杨梅坑山地植物群落演替动态

以深圳市杨梅坑山地两个植物群落为调查对象，分析其物种组成、物种多样性特征、重要值的变化，探讨不同阶段植物群落的演替动态规律。结果表明，两个植物群落经过7年演替后，植物群落的丰富度有所增加，且种类组成出现明显差异，两个植物群落在不同时期所呈现的自然景观不一样。群落科、属、种的数量差异明显。原鸭脚木-九节-铁线蕨群落2013年共有26科36属39种，2018年共有19科29属30种，2019年共有32科51属61种；原绒毛润楠-瓜馥木-团羽铁线蕨群落2013年共有25科30属33种，2018年共有24科33属33种，2019年共有42科67属83种。两个植物群落乔木层、灌木层、草本层三个层次的物种多样性指数和Pielou均匀度指数几乎都呈先下降再上升的趋势。演替系列中，乔木层、灌木层和草本层的物种组成均表现出耐荫种替代非耐荫种的趋势，且植物群落的层次由简单趋向复杂。

Succession Dynamics of Plant Community in Yangmeikeng Mountain,Shenzhen

Taking two plant communities in Yangmeikeng mountain in Shenzhen as the survey object, the changes of species composition, species diversity characteristics and important values of the community were analyzed, and the succession dynamic pattern of plant community in different stages was discussed. The results showed that after 7 years of succession, the richness of the two plant communities increased, and the species composition in the two plant communities differ significantly. The natural landscapes of the two plant communities are also different in different periods. In the community family, genus, species of the quantitative composition, the difference is obvious. The original Schefflera octophylla–Psychotria–Adiantum capillus-veneris community was composed of 26 families, 36 genera, 39 species in 2013, and 19 families, 29 genera, 30 species in 2018, and a total of 32 families, 51 genera, 61 species in 2019; the original Machilus velutina–Fissistigma oldhamii–Adiantum capillus-junonis community was composed of 25 families 30 genera 33 species in 2013, a total of 24 families 33 genera 33 species in 2018, and a total of 42 families 67 genera 83 species in 2019. The species diversity index and Pielou evenness index of tree layers, shrub layers and herbaceous layers in both plant communities almost decreased first and then increased. The species composition of trees, shrubs, and herbaceous layers in the succession series showed the tendency of shade-tolerant species to replace shaded-intolerant species, and the hierarchy of plant community changes from simple to complex.