宝天曼植物群落物种多样性研究

对宝天曼保护区植物群落物种多样性进行了研究。结果表明 ,物种丰富度指数、多样性指数和均匀度指数在群落梯度上的分布趋势基本一致 ,较好地反映了不同植物群落类型在物种组成方面的差异。草本层物种丰富度指数明显高于乔木层和灌木层 ,草本层物种丰富度指数在群落梯度上的变异最大 ,灌木层次之 ,乔木层最小。乔木层物种多样性指数小于灌木层和草本层 ,草本层和乔木层物种多样性指数在群落梯度上的变异程度明显大于灌木层。灌木层物种均匀度指数大于乔木层和草本层 ,草本层和乔木层均匀度指数在群落梯度上的变异程度大于灌木层。物种丰富度指数和多样性指数的较大值出现在高海拔和低海拔群落 ,较小值多出现在中等海拔群落。物种均匀度指数的较小值多出现在中等海拔群落 ,但其较大值在各海拔群落都有分布。草本层物种丰富度指数和多样性指数的较高值多分布在低海拔群落 ,较小值多分布在中等海拔群落 ;乔木层和灌木层的各种指数以及草本层的物种均匀度指数在海拔梯度上的分布规律不明显

STUDY ON SPECIES DIVERSITY OF PLANT COMMUNITIES IN BAOTIANMAN

Species diversity of plant communities in Baotianman was studied in this paper.Distribution trends of species richness indices,species diversity indices and species evenness indices along the community gradient were almost the same.They reflected the different species composition of different plant communities.Species richness indices of herb layer were higher than that of both tree and shrub layer,and its variations along the community gradient were higher than that of shurb layer,while shrub layer were higher than of tree layer.Species diversity indices of tree layer were lower than that of shrub and herb layer,variations of shrub layer along the community gradient were lower than that of both herb and tree layer obviously.Species evenness indices of shrub layer were higher than that of both tree and herb layer,and its variations along the community gradient were lower than that of both tree and herb layer.Species richness indices and diversity indices of the plant communities that distribute at both high and low altitude were higher than the plant communities at middle altitude.The plant communities at middle altitude had lower species evenness indices mostly,but higher values occurred in the plant communites at all altitude.The higher species richness indices and diversity indices of herb layer occurred at low altitude,the lower occurred at middle altitude.The patterns of all kinds of indices of tree and shrub layer and species evenness indices of herb layer along altitude gradient were variable.