论文部分内容阅读
应用丰富度、多样性、均匀度指标 ,研究了北京西山地区 10种人工林群落的物种多样性 .结果表明 :①大多数群落的Shannon Wiener指数H在 1 5～ 3 0之间 ,且与物种丰富度指数的变化趋势一致 ,使用效果比较理想 ;②不同人工林群落中 ,乔木第一亚层的物种丰富度指数和Shannon Wiener指数均低于乔木第二亚层 ,而Simpson指数则相反 ;③不同人工林群落中 ,槲树和华山松林物种丰富度和Shannon Wiener指数较高 ;④草本层的物种丰富度和Shannon Wiener指数高于灌木层和乔木层 ,而乔木层和灌木层没有明显的差异 ;⑤各多样性指数在不同群落间的变化幅度均为草本层 >灌木层 >乔木层 .
The species diversity of ten plantations in Xishan area of Beijing was studied by using the indices of richness, diversity and evenness. The results showed that: ① The Shannon Wiener index H of most communities was between 15 and 30, (2) The species richness index and Shannon Wiener index of the first sub-layer of tree species were lower than that of the second sub-tree layer in the different plantation community, while the Simpson index was the opposite; ③ Among different plantations, species richness and Shannon Wiener index were higher in the plantations of Quercus mongolica and Pinus armandi. (4) The species richness and Shannon Wiener index of the herb layer were higher than those of the shrub layer and the tree layer, but no significant difference between the tree layer and the shrub layer ; ⑤The diversity index of each community varied from herb to shrub layer to arbor layer.