[目的]从植物资源利用的角度，定量研究南岭山地杜鹃花沿海拔梯度的分布，以期为城乡园林绿化推荐可供引种的潜在杜鹃花种类．[方法]在南岭山地海拔700～1900 m范围内，采用样方法设置样地，运用相关分析和双向指示种分析（ TWINSPAN）探讨南岭山地垂直带谱上的杜鹃花分异特征．[结果和结论]基于15600 m2样方数据，南岭山地共有杜鹃花属植物7种，皆为小径阶的常绿灌木或小乔木；TWINSPAN将7种杜鹃花分为3大类，第1大类由刺毛杜鹃Rhododendron championae、猴头杜鹃R．simiarum和龙山杜鹃R．chunii组成，第2大类由多花杜鹃R． cavaleriei、广东杜鹃R．kwangtungense和腺萼马银花R．bachii组成，云锦杜鹃R．fortunei自成第3大类，分类结果反映出南岭山地杜鹃花属沿海拔梯度的变化，揭示采用数量分类方法能够根据植被组成反映环境特点的生态原理；垂直带谱上，多花杜鹃分布最为广泛，其次为腺萼马银花，刺毛杜鹃和猴头杜鹃出现在多个海拔段．%[Objective]The objective was to determine the altitudinal pattern of Rhododendron plant distri-bution and the potential of using indigenous Rhododendron plant resource in landscape greening .[Meth-od] The continuous transect sampling method was employed and a total area of 15 600 m2 was surveyed . A horizontal transect (10 m ×120 m) was placed at an 100 m altitudinal interval from 700 m to 1 900 m a.s.l., representing the altitudinal range of Rhododendron in Nanling mountains of north Guangdong . The contiguous grid quadrat sampling method was used for plant census in each transect , which consisted of 12 quadrats (10 m ×10 m).Correlation analysis and two-way indicator species analysis (TWINS-PAN) were used to analyze the altitudinal patterns of Rhododendron species.[Result and conclusion]Seven Rhododendron species were found in the 15 600 m2 plot, all of which were perennial evergreen woody shrubs or small trees .These Rhododendron species were divided into three categories by TWINS-PAN.The first category was R.championae, R.simiarum and R.chunii;the second was R.cavaleriei, R.kwangtungense and R.bachii, and the third was R.fortunei.These TWINSPAN results indicated that environmental factors influenced the distribution and ecological characteristics of Rhododendron species. The most widely distributed species in an altitudinal spectrum is R.cavaleriei, followed by R.bachii and R.championae.The altitudinal patterns of these native Rhododendron species reflect their bioclimatic ad-aptation and phenology , which have potentials for use in landscape greening .
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