摘要
初步研究了中国地区种子植物区系系统发生多样性的纬度梯度格局,使用稀疏分析(rarefaction analysis)方法对中国15个地区的种子植物区系的平均属大小指标进行处理,同时应用对数级数模型的α指数来反映系统发生多样性。稀疏分析使平均属大小指标的变异系数由0.160 5降低为稀疏分析后的0.073 4,表明种子植物区系的平均属大小指标差异在很大程度上依赖于区系大小的差别。结果表明,稀疏分析后的平均属大小和对数级数模型的α指数存在显著的纬度梯度格局,即平均属大小随着纬度的升高而变大(r=0.724 3,P<0.01),对数级数模型的α指数随着纬度的升高而降低(r=-0.794 2,P<0.001),表明种子植物区系的系统发生多样性与纬度高低呈显著的负相关。
The latitude gradient pattern of spermatophyte phylogenetic diversity in China was studied.Rarefaction analysis was used to treat the mean genus size of spermatophyte floras in 15 areas of China.And α index of logarithm series model was applied to reflect the phylogenetic diversity.After rarefaction analysis,variation coefficient of mean genus size was reduced from 0.160 5 to 0.073 4,indicating much dependence of mean genus size on flora size.After rarefaction,mean genus size was positively correlated with latitude significantly（r=0.724 3,P0.01）,while α index was negatively correlated with latitude significantly,both indicating significant negative correlation between phylogenetic diversity and latitude（r=-0.794 2,P0.001）.
出处
《安徽农业科学》
CAS
北大核心
2010年第6期3122-3124,共3页
Journal of Anhui Agricultural Sciences
关键词
种子植物区系
系统发生多样性
纬度梯度格局
稀疏分析
Spermatophyte flora
Phylogenetic diversity
Latitude gradient pattern
Rarefaction analysis
