鼎湖山林窗形成特征及其对幼树组成和多样性的影响

在对鼎湖山自然保护区植物群落动态长期监测的基础上，研究了保护区内各林窗成因、大小和年龄等形成特征，以及地形位置、附近同种的成年乔木等其它相关因子，探讨其对幼树组成和多样性的影响。林窗主要由山体滑坡、暴风雨或雷击大树、虫害等原因形成。结果显示，幼树组成、密度和多样性随林窗形成方式而异，因耐荫能力的差异使出现在林窗的植物不尽相同。林窗大小、年龄和地形位置的变化，导致植物更新生态位的分化，使幼树在林窗内分布形成同源种团。

Gap Formation Characteristics and Its Effects on Sapling Composition and Diversity in Dinghushan Biosphere Reserve

Based on a long term survey of plant population dynamics, we investigated 26 gaps to study the factors that affect sapling species composition and biodiversity in gaps at different succession stages in Dinghushan Biosphere Reserve. Gap formation, gap size and age, topography and location, adult tree around gaps, saplings of tree species growing in the gaps were investigated. The formation of gaps resulted from landslide, storm, pest damage, etc. Sapling composition, sapling density and diversity in gaps were different due to different causes of gap formation. Species growing in the gaps were quite different because of their differences in shade tolerance and in succession stages. Differentiation of regeneration niche was caused by variation of gap size, age and topographic factor, which resulted in the appearance of sapling guild in the gaps.