| 摘要: |
| 【目的】研究林下植物在不同林冠开度梯度下的物种组成和多样性变化，为森林生态系统多样性维持机制提供新的研究案例，并为野生植物的引种应用提供科学依据。【方法】基于广东省银瓶山自然保护区2 hm2固定样地调查数据，将林冠开度(CO)划分为第1梯度（CO<10%）、第2梯度（10%≤CO≤20%）和第3梯度（20%P<0.05），与偏度和峰度呈显著负相关。指示种分析表明，有多个林下物种对第1梯度（CO<10%）和第3梯度（20%Heterosmilaxjaponica）、三叉苦（Evodia lepta）对第1梯度林冠开度表现极显著的指示作用（P<0.005），蒲桃（Syzygium jambos）对第3梯度林冠开度起极显著的指示作用（P<0.01），前者对弱光环境表现较强的适应性，而后者则适应于较强的光照环境。 |
| 关键词: 林冠开度 林下植物 植物多样性 多响应置换过程（MRPP） 指示种分析 |
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| 基金项目:广东省科技计划项目（2013B020305008）；东莞市自然保护区森林公园管理办公室资助项目(东采单［2013］115号) |
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| Composition and diversity of understory plant species in subtropical forests under different canopy openness |
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WANG Yongqiang,CAI Yanru,ZENG Huanchen,et al
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| Abstract: |
| 【Objective】This study investigated composition and diversity of understory species under different gradients of canopy openness to provide new cases for the research of maintaining species diversity and scientific basis for introduction and utilization of wild plants.【Method】Data collected from 2 hm2 sample plots in Yinpingshan Nature Reserve of Guangdong were analyzed.The canopy openness （CO） is divided into three gradients which are the first gradient （CO<10%）,the second gradient （10%≤CO≤20%）,the third gradient（20P<0.05),while negatively correlated with skewness and kurtosis.ISA showed that a number of understory species had indicating function for low and high canopy openness.【Conclusion】Heterosmilax japonica and Evodia lepta had significant indication effect for low canopy openness (P<0.005),indicating that they were more adaptive to low light environment,whereas Syzygium jambos was more adaptive to high radiation environment with significant indication effect for high canopy openness (P<0.01). |
| Key words: canopy openness understory plant plant diversity multi-response permutation procedures（MRPP） indicator species analysis |
