杉木林林分改造后林下药用植物群落多样性特征OACSTPCD

To understand the community diversity characteristics of understory medicinal plants in Chinese fir(Cunninghamia lanceolata)forest stands after conversion,this study selected 7 plots of artificially modified stands in Xiaokeng Forest Park,Shaoguan City,Guangdong Province,as the subjects of research.Additionally,two Chi-nese fir forests of different ages and one secondary forest were used as comparative references.The α and β diver-sity indexes were used to analyze the understory medicinal plant diversity after modifications to different stand types.The results showed that there were 117 genera and 171 species of understory plants in 64 families in 10 different stand types,including 106 species of medicinal plants in 84 genera and 55 families.Among the medicinal plants,the largest number of plants were used as roots for medicinal purposes(45 species,27.77％)and as purga-tives for medicinal effects(56 species,25.79％).The richness of herbaceous layer of understory vegetation varia-tion showed little among different stand types,while the richness of shrub layer varied greatly among different stand types.The maximum richness of shrub layer of medicinal plants appeared in mixed broad-leaved forest and third-generation Chinese fir forest,and the maximum richness of herb layer appeared in monoculture Elaeocarpus sylvestris forest and third-generation Chinese fir forest.The Simpson dominance index and Shannon-Wiener di-versity index of understory vegetation and medicinal plants of different stand types showed similar trends.The Pielou evenness index of understory vegetation and medicinal plants in shrub layer and herbaceous layer was rela-tively stable.The Jaccard similarity index and the Morisita-Horn similarity index in the herbaceous layer were higher than those in the shrub layer,and the medicinal plants in the shrub layer were higher than the understory vegetation.There were great differences among different stand types,mainly in that the diversity of medicinal plant β in the broadleaf tree stands after the transformation,which was more consistent.In conclusion,the conver-sion of Chinese fir forest stand types will reduce the diversity of understory vegetation and medicinal plant com-munities,and broad-leaved mixed forests are more suitable for the development and utilization of shrub wild me-dicinal plant resources,whereas monoculture Elaeocarpus sylvestris forests are more suitable for herbaceous me-dicinal plants.It is recommended that the monitoring of the dynamics of the restoration of the diversity of medic-inal plants in the understory should be further strengthened.The results of this study can provide references for the development and utilization of understory wild medicinal plant resources.