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以山西华北落叶松林为研究对象,调查了40个样地,共记录了219种植物,隶属于3门5纲34目49科145属。山西华北落叶松林下的物种组成和分类单元比较丰富,但主要以几个大的分类单元为主;在目的水平上集中于蔷薇目和桔梗目,在科水平上集中于菊科、蔷薇科、毛茛科。植物科内种、属组成差异较大。应用平均分类差异指数Δ+与分类差异变异指数Λ+对山西华北落叶松群落进行了分类学多样性分析,结果表明:40个样地的Δ+值大部分位于理论平均值曲线之上,说明山西华北落叶松林物种分类多样性较大,物种间的亲缘关系较远;所有样地的Λ+值均位于Λ+值的理论平均值曲线之上,表明山西华北落叶松林物种分类等级的均匀度较差,低于平均理论均匀度。平均分类差异指数Δ+与环境因子中的经度、坡度、坡位、海拔和种数相关性显著(P<0.05),与纬度和坡向相关性不显著(P>0.05);分类差异变异指数Λ+与海拔、经度、坡度和种数相关性显著(P<0.05),与纬度、坡向和坡位相关性不显著。
Taking Larix principis-rupprechtii forest of Shanxi as the research object, 40 plots were surveyed and 219 plants were recorded, belonging to 3 orders, 5 classes, 34 orders, 49 orders, and 145 genera. The species composition and taxonomic units of Larix principis-rupprechtii in Shanxi Province are relatively abundant, but are mainly dominated by several large taxa. At the purpose level, they are concentrated in the order of the Rosaceae and Campanulaceae and focus on the Compositae, Rosaceae, Ranunculaceae. Plant species within the species is a large difference between the composition. The taxonomic diversity of Larix principis-rupprechtii populations in Shanxi was analyzed using the mean taxonomic difference index Δ + and the taxonomic difference index Λ +. The results showed that most of the Δ + values of 40 plots were above the theoretical average curve, indicating that The species diversity of Larix principis-rupprechtii in Shanxi is quite diverse, and the genetic relationship among them is far. The Λ + values of all plots are above the theoretical average curve of Λ +, indicating the evenness of species classification of Larix principis-rupprechtii Poor, below average theoretical uniformity. The mean taxonomic difference index Δ + was significantly correlated with longitude, slope, slope position, altitude and species in environmental factors (P <0.05), but not significant with latitude and aspect (P> 0.05). The classification difference of variation index There was a significant correlation between Λ + and altitude, longitude, slope and species (P <0.05), but not significant with latitude, aspect and slope position.