西南桦人工林群落层次均可分为 3层 ,乔木层、灌木层、草本层。下层植物很难达到上层。西南桦是上层的主要树种 ,具有较丰富的层间藤本植物。山地雨林群落可分为 5层 ,乔木层上、中、下层 ,灌木层 ,草本层。各人工林类型均具有一定数量藤本植物 ,体现出一定的山地雨林特征。 4种类型的方差分析S检验表明 ,各类型草本层、藤本植物种类数量差异不明显 ;灌木层植物种类、西南桦 +马占相思差异显著 ,西南桦 +山桂花和山地雨林差异显著 ,山地雨林 >西南桦 +马占相思 >西南桦 +山桂花 ,西南桦 +山桂花的种类数远小于西南桦 +马占相思和山地雨林 ;乔木层山地雨林和其它 3种人工林群落差异显著。各层次的多样性指标D、H在 4种类型的变化上除乔木层外都表现出同样的趋势。灌木层的多样性指数均较其它层次高 ,藤本植物次之 ,草本最低。在 3种人工林中 ,西南桦 +马占相思的灌木层、藤本植物多样性指数均较高 Betula alnoides plantation community level can be divided into three layers, arbor layer, shrub layer, herb layer. The lower plants are hard to reach. Southwest birch is the main tree species of the upper layer, with a richer layer of lianas. Mountain rain forest community can be divided into 5 layers, arbor layer, middle and lower layer, shrub layer, herb layer. Each type of plantation has a certain number of vines, reflecting some of the characteristics of the mountain rainforest. There was no significant difference in the number of species of grass and rattan among the four types of vegetation. The species of shrub layer was significantly different in Betula alnoides and Acacia mangium, but there was significant difference in Betula alnoides and Montane rain forest, > Southwest Birch + Acacia mangium> Southwest birch + mountain sweet-scented osmanthus, Southwest birch + mountain sweet-scented osmanthus species is much smaller than the Southwest Birch + Acacia mangium and the mountain rainforest; tree layer mountain rainforest and the other three kinds of plantation community differences significantly. The diversity indexes D and H at all levels showed the same trend except for the arbor in all four types of changes. The diversity index of shrub layer was higher than other levels, followed by vine and lowest. Among the three kinds of plantations, shrub layer and liana diversity index of Betula alnoides + Acacia mangium were higher