中文摘要：

【目的】探究冬青幼苗更新与环境因子的相关关系,为苏南丘陵山区森林抚育和可持续经营提供参考。【方法】对江苏省溧水林场内4块有一定代表性的天然次生林样地进行详细调查,在分析不同群落中冬青幼苗的个体大小-密度分布特征的基础上,运用冗余分析（RDA）的方法对冬青幼苗更新状况与种内、种间、土壤因子的相关关系进行研究。【结果】随着群落中冬青重要值上升,冬青幼苗由＂高密度-小株型＂的分布特征,逐渐转变为＂低密度-大株型＂状态。3类环境因子对冬青幼苗更新总体表现为促进作用,但不同林层的林分结构因素间及不同种类的土壤因素间存在一定差异。当冬青重要值较高时,种内因子和种间因子组成的林分结构因素是主要影响因素,土壤因子影响较小,此时种间作用主要体现于上层高大乔木的影响。当冬青重要值较低时,土壤因子的影响超过林分结构因素,此时林分结构的影响主要表现为较强的更新层种间作用。【结论】在苏南丘陵山区森林中,不同类型群落中影响冬青幼苗更新的主导因子不同,林分结构和土壤因子对冬青幼苗更新的作用因群落中冬青重要值高低存在一定差异。

英文摘要：

【Objective】Seedling regeneration is an important part of natural succession and vegetation restoration,and studying the relationship between seedling regeneration and environmental factors could provide useful information for managing natural secondary forests.【Method】We selected four sampling plots that were typical subtropical secondary forest communities in the Lishui Forestry Farm,Jiangsu Province,China,studied the size-density distribution characteristics of Ilex chinensis seedlings in each plot.On this basis,we analyzed the relationships between I.chinensis seedlings and three kinds of environmental factors,including intraspecific,interspecific,and soil factors,by the method of the redundancy analysis（RDA）.【Result】With increasing importance value of I.chinensis in different communities,size-density distribution characteristic become from ＇high density-small size＇ to ＇low density-big size＇.In general,three kinds of environmental factors promoted seedling regeneration,but there were differences between the factors.In communities with high I.chinensis importance values,the stand structure factors,including intraspecific and interspecific factors,were dominant,and the interspecific interactions mainly shows in main story.With decreasing I.chinensis importance values,the influence of soil factors gradually exceeded that of the stand structure factors,and interspecific interactions in the regeneration layer became stronger.【Conclusion】In the mountainous region of southern Jiangsu Province,dominant factors affecting seedling regeneration vary by community type,and the effects of environmental factors change with importance value of I.chinensis.