缙云山常绿阔叶林次生演替序列群落物种多样性动态研究

采用物种丰富度Ｓ和物种多样性香农指数Ｈ、物种均匀度指数Ｊ以多样性－面积曲线研究缙云山常绿阔叶林次生演替序列物种多样性近十年的变化，结果表明，１０年后，群落各层物种多样性指数均有下降趋势，草本层下降最为明显；群落及乔、灌木层的多样性指数（Ｓ，Ｈ，Ｊ）在演替中后期阶段均呈下降趋势，而演替前期的马尾松和林龄较短的混交林Ⅰ却有上升趋势；群落各层多样性最小面积按马尾松林、混交林到常绿阔叶林顺序增长，两个混交

A study on the dynamics of species diversity of the secondary succesional communities of evergreen broad-leaved forests on Jinyun Mountain

According to species richness(S), Shnnon-Weiner index(H)and sterve of diversity-area, we study on the dynamics of species diversity of the secondary succesional communities of evergreen broaded-leaved forests on Jinyun mountain about ten years. The results are follows: after ten years, the diversity indices of strata all share a tendency of decrease and the decrease is much more great in the herb strata. The diversity of communities as well as tree and shrub strata (S, H, J)tends to decrease during the middle and later periods of succession. However, in the early period of succession, that of Pinus forest and the younger mixed forests tend to increase. The minimum sample area of strata diversity of communities increase in the order of pinus forest, mixed forest and evergreen broad-leaved forest. As to the mixed forests, the minimum sample area is the in the direct proportion with S and in diverse proportion with J. The minimum sample area of the herb stratum is mainly affected by S but those of the tree and shrub stratum are mainly affected by J. As to the two highest communities, they have own different dominant species only because they are in different habitates.