季风常绿阔叶林建群种的死亡动态格局  

Dynamics Death of Constructive Species in Monsoon Evergreen Broad Leaved Forest

作　　者：李林[1] 伍婵翠[1] 莫德清[1] 魏识广[1] 黄忠良[2] 

机构地区：[1]桂林电子科技大学生命与环境科学学院,广西桂林541004 [2]中国科学院华南植物园,广东广州510650

出　　处：《西南林业大学学报（自然科学）》2014年第6期29-34,共6页Journal of Southwest Forestry University：Natural Sciences

基　　金：国家自然科学基金项目(31200326;31200412)资助;桂林市研究开发项目(20130116-3)资助

摘　　要：鼎湖山季风常绿阔叶林的建群种黄果厚壳桂，在近20年的监测过程中出现了死亡个体数量明显大于新增的现象。为此以黄果厚壳桂12 a的连续监测数据为依据，根据群落受到的干扰程度划分为重度干扰和轻度干扰2个阶段，统计其死亡动态。分干扰阶段，采用空间二元点格局L12方程分析，检测新增个体与死亡个体之间的关系。结果显示，重度干扰阶段，死亡个体48．2％是4 cm以下小树；而轻度干扰阶段，10 cm以上的死亡个体数占到死亡总数的80．5％。1992年新增个体，与1999年死亡和2004年死亡个体之间有较大尺度的正相关性，而1999年新增个体与2004年死亡个体间，仅在取样尺度1m时表现出空间显著正相关。先亡个体与后增个体的空间关联检测，仅发现1999-2004年死亡个体与2004年新增个体之间，小尺度上（取样尺度＜5 m，6～8 m）有显著正相关性。12年间死亡个体数量是新增数量的2.29倍，死亡个体主要是1992年以来的新增个体。严重的干扰加速了季风常绿阔叶林的演替进程，在以后的监测过程中，应严防重度干扰的出现，确保地带性植被季风常绿阔叶林群落正常的发展和演替。The constructive species Cryptocarya concinna of monsoon evergreen broad leaved forest located in Dinghushan natural reserve was monitored over 20 years.A phenomenon that number of dead individuals was signif-icantly greater than newly increased individuals was observed.In this study,based on datas C.concinna for 12 years,community were divided severe interference and light interference stages by interference degree and dynamics death of C.concinna was statistics.Used the spatial binary point pattern L-function to analyze associations between new and dead individuals at different interference stages.The study results showed that 48.2% dead individuals were small size trees with DBH less than 4 cm in severe interference stage,while 80.5%dead individuals were big size trees with DBH more than 10 cm.New individual occurred in 1992 were positively associated with dead tree number in 1999 and 2004 at some scales.However,when sampling scale was less 1 m,only found a spatial posi-tive correlation between new individual in 1999 and dead tree in 2004.Spatial correlation analysis of dead trees in＆nbsp;previous stage and new trees indicated that trees death number occurred from 1999 to 2004 were positively correla-ted to dead trees number counted in 2004 at a small scale （sampling scale was less 5 m）.The number of tree death in 12 years was 2.29 times the number of new added trees.Dead trees were mainly those individuals newly in-creased since 1992.Severe interference accelerated succession process of community.Therefore,in the process of future monitoring,we should take strict precautions against severe interference,and insure zonal vegetation mon-soon evergreen broad leaved forest normally development and succession.

关 键 词：黄果厚壳桂 季风常绿阔叶林 干扰程度 死亡动态 空间关联 

分 类 号：S718.54[农业科学—林学]