【摘要】 为揭示滇西北天然牡丹居群的表型变异程度和变异规律,利用12个形态指标对18个滇西北牡丹（Paeonia delavayi）的天然居群进行表型多样性研究。结果表明:滇西北牡丹表型性状在居群间存在广泛的变异,12个性状居群间的变异系数为16.65%¹07.78%,种群间的平均变异系数为38.44%。在研究的18个居群中,宁蒗拉伯乡居群的变异最小,变异系数为25.02%;其次是玉龙县大平坝居群,变异系数为26.68%;以丽鸣线路旁居群的变异为最大,变异系数为50.86%。滇西北牡丹变型性状在居群间和居群内存在着丰富的表型多样性,12个表型性状的平均表型分化系数为98.51%,居群间的变异（48.87%）大于居群内的变异（0.59%）,表明居群间的变异是表型变异的主要来源。滇西北牡丹表型性状与地理因子的典型相关分析表明,坡度能正向依次解释单荚荚长(y₁₁)、果柄长(y₈)、叶柄长(y₄)和单荚总数(y₁₀),负向依次解释单荚荚宽(y₁₂)、荚果数(y₉)和株高(y₁);聚类分析结果说明滇西北牡丹居群间表型性状变异是不连续的。更多还原

【Abstract】 To reveal the variation degree and variation regularity of natural peony populations in northwest Yunnan, we used 12 morphological indexes to study the phenotypic diversity of 18 natural populations of Paeonia suffruticosa. The results showed that there was a wide range of variation in the phenotypic traits of P.suffruticosa in northwest Yunnan, the variation coefficient of the 12 traits among the populations was 16.65%-107.78%. The average coefficient of variation among populations was 38.44%. Among the 18 populations studied, the variation of Ninglang County Township Labo population was the smallest, the coefficient of variation was 25.02%; followed by Yulong County Dapingba population, the coefficient of variation was 26.68%; the variation of Liming Line population was the highest, the coefficient of variation was 50.86%. There were abundant phenotypic diversities among the populations and within the populations in northwest China.The mean phenotypic differentiation coefficient of 12 phenotypic traits was 98.51%, the variation among populations（48.87%） was greater than that within populations（0.59%）, indicating that the variation among populations was the main source of phenotypic variation. The canonical correlation analysis between phenotypic traits and geographical factors showed that, the gradient could be interpreted in positive direction of single pod length(y₁₁), pedicel length(y₈), petiole length(y₄), total number of pods(y₁₀); the gradient could be explained in negative direction of pod width(y₁₂), number of pods(y₉), plant height(y₁). The results of cluster analysis showed that the variation of phenotypic traits among populations of P. suffruticosa was discontinuous.更多还原