| 摘要: |
| 调查马蹄参在湖南、广东、广西、云南4省9个天然种群20项枝叶的形态指标在种群内和种群间的表型变异,运用相关分析揭示枝和叶形态指标间以及与环境因子之间的相关性,并进行聚类分析(UPGMA)和主成分分析。结果表明:各性状在种群内和种群间均存在一定变异性。广西花坪自然保护区两个种群(HP1,HP2)枝叶形态性状(尤其是枝)的平均观测值高于其它7个种群; 枝叶形态性状变异系数的平均值从大到小排列为南岭2、莽山2、法斗、莽山1、鹅凰嶂、花坪2、花坪1、大瑶山和南岭1。方差分析显示,在调查的20项形态性状中,13项性状在种群间的差异达显著(P<0.05)或极显著水平(P<0.01,0.001),种群间F值在0.184～31.788之间。相关性分析显示,营养器官间的相关性较高; 1月均温、极端最低温、年均温、土壤有机质等环境因子对马蹄参的生长影响较大。聚类分析表明,形态分化不与种群间的地理距离相关联。主成分分析显示,所有个体在前三个主分量中占总信息量的66%。 |
| 关键词: 马蹄参 濒危物种 形态变异 环境因子 相关性分析 |
| DOI：10.3969/j.issn.1000-3142.2011.05.014 |
| 分类号:Q948.11 |
| Fund project: |
|
| Studies on the correlation between the branch and leaf morphological variation of Diplopanax stachyanthus and the environmental factors |
|
WANG Li1, WU Min1, XU Yi2, YOU Zhang-Ping3, ZHANG Ding-Heng4
|
|
1.School of Biological Science and Technology, Central South University, Changsha 410013, China;2.Administration
Bureau of Ehuangzhang Nature Reserve, Yangchun 529600, China;3.Administration Bureau of Nanling State Nature
Reserve, Ruyuan 512727, China;4.Administration Bureau of Huaping State Nature Reserve, Lingui 541100, China
|
| Abstract: |
| Nine natural populations of Diplopanax stachyanthus,which belongs to the Grade II state-protected endangered plants,were sampled from Hunan,Guangdong,Guangxi,and Yunnan provinces. Variation of 20 morphological characters within and between populations was measured,and the correlations among morphological characters,and between these characters and environmental factors,were investigated. In addition,UPGMA-based cluster analysis and principal components analysis(PCA)were performed using the phenotypic data. The results revealed morphological variation within and among the populations of D.stachyanthus. Among the nine populations,the highest mean value of all measured morphological traits,especially that of branch traits,occurred in the two Huaping populations(HP1,HP2). The mean variation coefficients also varied among populations,with the ordering of NL2>MS2>FD>MS1>EHZ>HP2>HP1> DYS&NL1. The variance analysis revealed significant among-population variation in 13 morphological characters(P<0.05,0.01 or 0.001,respectively),with F values ranging from 0.184 to 31.788. Pearson correlation analysis showed that the correlation was high among vegetative organs. The environmental factors,including average temperature in January,minimum temperature,annual average temperature and soil organic matter,could significantly affect the growth of D.stachyanthus. Cluster analysis showed that the morphological differentiation was not correlated with the geographic isolation among populations. PCA analysis resolved three principal components that explained 66% of the total variation. |
| Key words: Diplopanax stachyanthus endangered species morphological variation environmental factors correlation analysis |
