濒危植物毛柄小勾儿茶生存群落的数量分类

应用除趋势对应分析(DCA)与双向指示种分析(TWINSPAN)对濒危植物毛柄小勾儿茶(Berchemiella wilsoniivar.pubipetiolata)69块样地进行了排序与分类,共划分9个群落类型。结果表明,毛柄小勾儿茶生境特异性高。毛柄小勾儿茶在枫香(Liquidambar formosana)林、马尾松(Pinusmassoniana) 杉木(Cunninghamia lanceolata) 青冈栎(Quercus glauca)针阔混交林、杂木林和青榨槭(Acer davidii) 大果山胡椒(Lindera praecox)林中生长较好。这4个群落林下层优势种具有相似性:草本层的优势种中均有求米草(Oplismenus undulatifolius),常有三脉紫菀(Aster ageratoides);灌木层优势种常有大果山胡椒。毛柄小勾儿茶分布于海拔500~900 m的低山区,多分布于湿润、排水良好的沟谷边,生境坡向多为阴坡。

Ordination and classification of endangered plant Berchemiella wilsonii var. pubipetiolata communities

By using DCA ordination and TWINSPAN classification,a total of 69 plots with endangered plant Berchemiella wilsonii var.pubipetiolata were partitioned into 9 community types.Both the methods of DCA ordination and TWINSPAN classification obtained very consistent results.B.wilsonii var.pubipetiolata had a high habitat speciality,and grew well in four communities,i.e.,Liquidambar formosana community,Pinus massoniana+Cunninghamia lanceolata+Quercus glauca confer and broadleaf mixed community,complex community,and Acer davidii+Lindera praecox community.The understory of the four communities had some evident similarities,i.e.,Oplismenus undulatifolius and Aster ageratoides were the two dominant species of herb layer,and L.praecox was one of the dominant species of shrub layer.B.wilsonii var.pubipetiolata mostly distributed in low altitude (500-900 m above sea level) mountainous region characterized by higher humidity and well drainage,and was mostly found at northern slopes.