中文摘要：

目的：明确天平山淫羊藿在重庆的分布区及其群落特征,为资源的可持续利用提供依据。方法：通过实地调查,并用GPS定位,在此基础上采用样方法,对不同生境中天平山淫羊藿分布相对集中的7个样地所有物种的多度、频度和重要值进行统计和分析。结果：天平山淫羊藿分布于重庆市长寿区、垫江县、忠县及丰都县,分布区海拔351~663 m,群落类型包括针叶林、阔叶林和竹林。群落植物有33科48属56种,优势种主要是乔木层的料慈竹、栎类、柏木等,灌木层的海金子、檵木、铁仔等,草本层的蝴蝶花、五节芒、长穗腹水草、披针薹草、天平山淫羊藿等。7个植物群落的物种丰富度指数D在1.1143~3.7781之间,群落中物种种数相对较少,个体数量相对较多;群落3和群落6的物种多样性指数H＇和均匀度指数E都相对较低,群落物种分布具有明显的不均匀性。乔木层的D值、H＇值和E值均低于灌木层和草本层,物种多样性较其余两层差。结论：建议将天平山淫羊藿收载入中国药典,作为正品淫羊藿药材之一。

英文摘要：

Objective： To make clear the distribution area in Chongqing and community characteristics of Epimedium myrianthum,in order to provide evidence for sustainable utilization of resources. Methods： Based on field investigation,recorded the GPS,and used the quadrat method to observe and analyze the abundance,frequentness and importance value of Epimedium myrianthum in the seven well-concentrated sample plots of different habitats. Results： Epimedium myrianthum distributed in Changshou County,Dianjiang County,Zhongxian County and Fengdu County of Chongqing at present. The altitude of its distribution areas ranged from 351 ~ 663 m. The types of its habitats included coniferous forest,broad-leaved forest and bamboo forest. The plants in these communities were composed of56 species belonging to 48 genera,33 families. Among associated plants,the dominant species of tree layer were Bambusa distegia,Quercus variabilis,Cupressus funebris etc. The dominant species of shrub layer were Pittosporum illicioides,Loropetalum chinense,Myrsine africana,Ardisia japonica,Smilax china etc. The dominant species of field layer were Iris japonica,Miscanthus floridulus,Veronicastrum longispicatum,Carex lancifolia,Epimedium myrianthum etc. Species abundance index of D was between 1. 1143 to 3. 7781 in seven populations,the species in these communities were relatively less,and the numbers of individuals were relatively more. Compared with others,the population of the 3rd and 6th had relatively low index of H＇（ Shannon-wiener index） and E（ Pielou index）. The distribution of these species in the community was obviously uneven. The D value,H＇ value and E value of tree layer species richness were lower than those of shrub layer and field layer,the species diversity was worse. Conclusion： It is suggested to incorporate Epimedium myrianthum in the new edition of Chinese Pharmacopeia.