【摘要】 以广东省象头山（XTS）和鹅凰嶂（EHZ）国家级自然保护区的亚热带次生林为对象，研究不同演替阶段的森林群落生态差异及驱动机制，以期为亚热带天然次生林恢复提供科学依据。结果表明：XTS群落物种丰富度高，樟科、茶科、茜草科占优势，前5科占33.9%;EHZ物种集中度更高，前5科占38.7%。XTS呈现多优势种共存格局（荷木、华润楠等），通过高盖度和多度分割资源；EHZ则以鹅掌柴、革叶铁榄为单优种，符合早期演替特征。两群落径阶均呈倒J型分布，但XTS存在较多大径阶个体，反映其低干扰环境。垂直结构上，XTS层次分明，光资源梯度缓解种间竞争；EHZ呈混龄单层林，优势种集中于5m～10m层，竞争激烈。两群落演替阶段差异显著：XTS大径级个体占比高，向顶级群落过渡；EHZ优势种高度集中，处于先锋种扩张初期。恢复策略上，XTS需保护大径级个体并调控下层物种；EHZ应引入乡土顶级种促进演替。更多还原

【Abstract】 Taking the subtropical secondary forests in Xiangtoushan(XTS)and Ehuangzhang(EHZ)National Nature Reserves in Guangdong Province as objects,this study investigated the ecological differences and driving mechanisms of forest communities at different succession stages,with a wish to provide a scientific basis for the restoration of subtropical natural secondary forests. The results showed that the XTS community had high species richness,with dominant families of Lauraceae,Theaceae,and Rubiaceae,with the top five families accounting for 33.9% of the total. The EHZ species was higher in concentration,with the top five families accounting for 38.7%. XTS presented a pattern of coexistence of multiple dominant species,and divided resources through high coverage and abundance. EHZ presented a single-dominant species pattern, which conforms to the characteristics of early succession. Both communities exhibited an inverted J-shaped distribution pattern in diameter,but XTS had more thick individuals,reflecting low-disturbance environments. Vertically,XTS had distinct layers,and the gradient of light resources alleviates interspecific competition. The forests in EHZ were mixed-aged and single-layered,in which the dominant species concentrated in the 5-10m layer with fierce competition. There was a significant difference in the succession stages between the two communities:the proportion of XTS large-diameter individuals was high,transitioning towards the apical community, while the dominant species of EHZ were highly concentrated and in the early stage of pioneer species expansion. In terms of recovery strategy,XTS needs to protect large-diameter individuals and regulate lower-level species,and EHZ should be introduced by local apical species to promote succession.更多还原