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萌生更新是森林木本植物重要的生活史策略,能够促使萌生树种长时间占据原有空间,对物种共存、群落构建与生态系统稳定性有重要的潜在影响;同时,萌生更新的植株具有较强的资源获取与竞争能力。但萌生更新对群落物种共存的作用还远未被理解。本文基于古田山5 ha亚热带常绿阔叶林监测样地的调查数据,研究了萌生更新对群落物种多样性的影响及作用机制。结果表明:(1)古田山常绿阔叶林中萌生树种的丰富度比例较高(63.95%),已发生萌生的物种多度比例较高(38.53%),潜在萌生多度比例更高(59.51%);(2)萌生现象在各分类群普遍发生,壳斗科、杜鹃花科、金缕梅科、山茶科等类群的萌生能力较强;(3)萌生物种丰富度比例与群落物种多样性的关系不显著,萌生物种多度比例与群落物种多样性呈负相关关系。由此推测,作为古田山亚热带常绿阔叶林中一种占优势的更新方式,萌生更新在保证萌生树种持续存活从而增加群落物种多样性的同时,在一定阶段又能抑制群落物种多样性的发展,对群落物种共存、生物多样性维持起到了较重要的调节作用。
Sprout regeneration is an important life history strategy of woody plants, which can promote the sprout tree species to occupy the original space for a long time, which has significant potential impacts on species coexistence, community construction and ecosystem stability. At the same time, the newly regenerated plants are stronger Access to resources and competitiveness. However, the role of initiation and regeneration in the coexistence of community species is far from being understood. Based on the survey data of 5 ha subtropical evergreen broad-leaved forest monitoring plots in Gutian Mountain, the effects of initiation and regeneration on the community species diversity and its mechanism were studied. The results showed that: (1) The proportion of eucalyptus species in the evergreen broad-leaved forest in Gutian Mountain was high (63.95%), and the species abundance (38.53%) and the potential multi-degree abundance (59.51% ); (2) Sprouting occurred universally in all taxa, and the sprouting ability of Fagaceae, Rhododendron, Hamamelisceae, Camellia and other groups was strong; (3) The proportion of germination species richness and community species diversity The relationship between species abundance and community species diversity was negatively correlated. It is speculated that as a dominant regeneration method in the subtropical evergreen broad-leaved forest in Gutian Mountain, the initiation and renewal can restrain the development of species diversity at a certain stage while ensuring the survival of the adventitious tree and increasing the species diversity of the community. Co-existence of community species, biodiversity has played a more important regulatory role.