中文摘要：

以缙云山银木荷群落为研究对象,根据野外调查的数据,结合物种多样性、坐标定位及生命表进行分析.结果表明,从1984-2009年,乔木层部分植株自然死亡是导致群落乔木层物种重要值及多样性变化的主要原因.25年前后群落垂直结构各层之间物种组成、群落乔木层物种的重要值和多样性变化较大.其间乔木层死木共计96株,占现存乔木层活立木的45.8%.死亡株数最多的为白毛新木姜子,占死亡总数的25%.坐标定位分析显示死木主要分布在原乔木层树种较密集的地方,而在原乔木层树种比较稀疏的地方有很多新植株成长进入乔木层.生命表分析表明银木荷种群存活曲线为Deevey-Ⅰ型.

英文摘要：

Based on the survey data in the field,the Schima argentea community in Jinyun Mountain forest has been analyzed according to the species diversity,coordinate location and life table.The results showed that natural death is the main reason for the changes of importance value and species diversity of the tree layer of the community from 1984 to 2009.There were large changes in species composition of the community,importance value and species diversity of tree layer of the community during the 25 years.From 1984 to 2009,the number of dead tree was 96,which accounted for 45.8% of living trees in tree layer.The number of dead Neolitsea aurata var.glauca was the most,which accounted for 25% of dead trees.Coordinate position showed that spatial distribution of dead trees was where the tree layer was dense.However,some new trees grew up into tree layer where plant was sparse.The life table analysis showed that the survival curve is Deevey-I in Schima Argentea community.