缙云山银木荷(Schima argentea)群落乔木层死亡数量与分布格局变化  

Changes of Death Count and Spatial Distribution of Tree Layer of Schima argentea Community in Jinyun Mountain Forest

作　　者：曾华[1] 胡廷章[1] 齐代华[2] 何帅[1] 

机构地区：[1]重庆大学生物工程学院,中国重庆400044 [2]西南大学生命科学学院三峡库区生态环境教育部重点实验室,中国重庆400715

出　　处：《生命科学研究》2010年第5期402-408,共7页Life Science Research

基　　金：国家自然科学基金资助项目(30771464);重庆市自然科学基金重点资助项目(CSTC-2008BA7032);西南大学专项基金资助项目(XDJK2009C146);西南大学博士金资助项目(124470-20700917)

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.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.

关 键 词：银木荷 自然状态 物种多样性 坐标定位 生命表 

分 类 号：Q948[生物学—植物学]