中文摘要：

虽然生境过滤对群落多样性及空间分布格局的影响被普遍承认，很多研究也对不同年龄结构树木与生境的关联程度及种间差异进行了探讨，但是针对植物生活史初期特别是植物更新与生境过滤的关系及其对群落结构的影响却鲜有报道. 本文综合分析了古田山亚热带常绿阔叶林24 hm2样地幼苗空间分布、更新动态与生境的关系，结果显示：（1）对24个物种更新格局进行基于Torus-translation的生境关联性检验，有11个物种表现出与特定生境类型显著相关，其中7个树种表现出对特定生境的显著正关联；（2）通过对幼苗群落中存活一年以上个体的指示种分析，确定了8个具有代表性的生境指示种及8对物种组合单元；（3）通过与以往针对胸径≥1 cm木本植物（非幼苗个体）的相关研究结果进行比较，发现样地内不同树木的幼苗与其对应的非幼苗个体的生境关联性均存在差别，表明生境过滤的影响会随着树木生活史阶段的不同而有所差别. 研究结果从不同角度证实了生境过滤对森林幼苗更新的影响，进一步说明了物种和生境关联性、生物个体间相互作用等生态学过程在树木生活史初期就已有所体现，并对整个森林群落多样性格局的形成具有重要影响.

英文摘要：

Niche theory hypothesized that habitat specialization would contribute to the high species diversity of tropical forests and adult tree patterns. However, the effect of habitat selection during early life stages on plant communities and the influence on seedling regeneration remains unresolved. We studied seedling distribution patterns in four habitat types of GTS 24 hm2 forest dynamic plots. （1） The torus-translation test was used to detect the species-habitat associations. Out of 24 seedling species, 11 species were significantly associated with a certain habitat, with seven species showing positive associations. （2） Indicator species analysis was used to investigate the strength of seedling species habitat specialization. We found eight representative indicator species and eight pairs of species combinations of particular habitat types. （3） Compared with early studies based on trees with d.b.h.≥1 cm （non-seedling trees）, we found habitat associations differed across plant-life stages. We conclude that habitat filtering influences the distribution and regeneration patterns at very early life stages, affecting the diversity of the whole community in this subtropical evergreen broadleaf forest in China.