摘要
对属大小的分析是植物区系研究的重要组成,属大小的分布格局可以在一定程度上反映植物区系的类群多样性与系统发生多样性。在植物区系研究中,平均属大小指标与植物区系包含的物种数有关,使不同植物区系的研究结果难以进行整合分析。对中国8个地区种子植物区系属大小的分布格局进行研究,对数级数模型取得了良好的拟合结果,拟合优度R2>0.99,属大小表现出与种—多度相似的分布格局。稀疏分析和相关分析结果表明:抽样大小较小时,平均属大小在稀疏分析前后的相关性不显著;而对数级数模型中α指数与稀疏分析前表现出稳定的相关性。同时,对于相同的抽样大小α指数与平均属大小之间存在显著的相关性。因此,α指数可以作为稳定的指标来描述植物区系的丰富程度。
Genus size analysis is an important component in floristic research. The distribution pattern of genus size can reflect taxonomic diversity and phylogenetic diversity of a certain flora to some extent. In floristic studies, we cannot perform meta-analysis with mean genus size for its dependence on flora size. We applied logseries model to fit genus size distribution patterns of 8 spermatophyte floras in China, and achieved good fitting result. The goodness of fit R2 〉 0.99, indicating similar patterns between genus size distribution and species abundance distribution. Rarefaction analysis and correlation analysis showed that, mean genus size is not significantly correlated with its original values before rarefaction when the sampling size is small, while α index from the logseries model is stably correlated with its original values. Moreover, α index is significantly correlated with mean genus size for all sampling size, thus it could be taken as a stable index to describe the flora richness.
出处
《植物研究》
CAS
CSCD
北大核心
2009年第1期103-107,共5页
Bulletin of Botanical Research
基金
教育部新世纪优秀人才计划项目(NCET-05-0431)
江苏省普通高校自然科学研究计划资助项目(No:08KJB180005)
关键词
种子植物区系
属大小
分布格局
对数级数模型
稀疏分析
spermatophyte flora
genus size
distribution pattern
logseries model
rarefaction analysis
