普洱季风常绿阔叶林次生演替中木本植物幼苗更新特征

被引:46
作者
李帅锋 [1 ]
刘万德 [1 ]
苏建荣 [1 ]
张志钧 [1 ]
刘庆云 [2 ]
机构
[1] 中国林业科学研究院资源昆虫研究所
[2] 云南省普洱市林业科学研究所
关键词
幼苗更新; 次生演替; 生活型; 高度级; 环境因子;
D O I
暂无
中图分类号
Q948 [植物生态学和植物地理学];
学科分类号
071301 [植物生态学];
摘要
以时空替代的方法,将针阔混交林、季风常绿阔叶林的次生林与成熟林等3个处于同一空间下的群落作为次生演替进程中的3个阶段,研究云南普洱地区次生演替过程中的木本植物幼苗更新特征,分析了次生演替过程中木本植物幼苗的物种组成、密度、高度级及与环境因子的相关性。结果表明:在8个共144 m2的幼苗样地中调查木本植物幼苗101种2014株,其中乔木幼苗是主要组成。随着次生演替的进行,木本植物幼苗、乔木与藤本幼苗密度逐渐增加,灌木幼苗密度无显著变化;藤本植物幼苗的物种丰富度随着次生演替进行而增加,乔木与灌木幼苗则无显著变化,成熟季风常绿阔叶林中木本植物幼苗Shannon-Wiener指数要显著小于针阔混交林与次生季风常绿阔叶林。次生与成熟季风常绿阔叶林木本植物幼苗多度随高度级增加而减少,针阔混交林则呈现偏峰曲线,幼苗密度均集中分布在高度20 cm以内,3个群落演替阶段木本植物幼苗物种丰富度随高度级增加呈现偏锋曲线。相似性系数反映出乔木和藤本幼苗的更新来源与群落的物种组成存在着紧密的联系。乔木幼苗密度分布与样地坡度之间存在着显著的负相关,灌木幼苗密度与土壤pH值之间存在着显著正相关。
引用
收藏
页码:5653 / 5662
页数:10
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