缙云山森林群落次生演替序列的垂直结构与物种多样性的关系

THE RELATIONSHIP BETWEEN VERTICAL STRUCTURE AND SPECIES DIVERSITY OF THE SECONDARY SUCCESSION OF THE FORESTS ON THE JINYUN MOUNTAIN

从垂直结构和物种多样性指数，测度分析了重庆市缙云山常绿阔叶林群落次生演替序列垂直结构与物种多样性的关系。结果表明，乔、灌木层物种丰富度相近，且明显低于草本层。各层的均匀度指数Ｊ与物种多样性指数Ｈ呈正相关，与生态优势度Ｄ呈负相关，并随演替进展向高均匀度低优势度发展。演替前期，各层物种多样性指数分异较大，演替后期，各层物种多样性指数分异较小，群落趋于相对稳定。

The relationship between the vertical structure in the secondary succession community of the evergreen broad leaved forests on the Jinyun Mountains in Chongqing and species diversity in them was estimated and analyzed based on their vertical structure and species diversity index. The abundance of species was shown to be similar in the tree stratum and the shrub stratum and conspicuously lower than that in the herb stratum. The evenness index J in various strata was in significant positive correlation with their species diversity index H and negatively correlated with their ecological dominance D. the communities seemed to be developing in a direction of higher species evenness and lower Simpson's dominance with the progress of succession. The diversity indices varied greatly in different strata at the earlier stages of succession and became more similar to each other at later stages of succession and the communities tended to be relatively stable.