凉水国家级自然保护区森林群落林下物种多样性

该文采用多样性指数、丰富度指数、均匀度指数等对凉水自然保护区森林群落林下灌木层和草本层的物种多样性进行研究.结果表明,用物种多样性指数、均匀度指数测度凉水自然保护区森林群落林下物种多样性,都反映出基本一致的趋势.其总体多样性顺序为:原始红松林>人工落叶松林>槭树红松林>阔叶红松林>云冷杉红松林>人工红松林>椴树红松林>白桦林.各群落林下总的丰富度主要受草本层丰富度的影响.云冷杉红松林和人工红松林的灌木层多样性指数均高于草本层,其他6种不同林型中,灌木层的物种丰富度、多样性指数都低于草本层.各林型的灌木层与草本层间的均匀度差异不大.通过群落主成分分析,得出第一主成分和第二主成分即物种丰富度指数S和物种多样性指数D的累积贡献率达98.945%,基本上反映了原来6个变量的信息.

Species diversity of undergrowth of forest communities in Liangshui Nature Reserve,northeastern China.

Using the indices of diversity,richness and evenness,the species diversity of shrub and herb layers under forest communities in Liangshui Nature Reserve was studied in this paper.The results showed that using the indices of diversity and evenness of the vegetation under forest communities,the total diversity order was Primary Korean pine forest>larch plantation>Acer-Korean pine forest>broadleaf-Korean pine forest>spruce-fir-Korean pine forest>Korean pine plantation>Tilia amurensis-Korean pine forest>Birch forest.The total richness index of each community was mainly influenced by the richness of the herb layers.The diversity indices of the shrub layers of spruce-fir-Korean pine forest and Korean pine plantation were higher than that of the herb layers.In the other six communities,the indices of diversity and richness of the shrub layers were lower than those of the herb layers.The difference of the evenness index between the shrub and herb in every community was very small.Through analyzing the main composition of the community,the accumulative contribution rate of the first main composition(species richness) and the second composition(species diversity) reached 98.945%,and the two indices basically reflected the information of the other six original variables.