千岛湖天然次生林群落生态学研究

Community ecology of secondary vegetation in Qiandao Lake,Zhejiang Province

根据千岛湖次生林群落的样地调查资料 ,采用极点排序将千岛湖次生林群落划分为暖性针叶林、针阔混交林、落叶阔叶林和常绿阔叶林等 4种类型。通过对各类型群落均匀度、物种多样性指数和生态优势度的分析比较 ,认为随着演替的发展 ,群落均匀度和物种多样性指数增加 ,4种群落类型的均匀度值依次为 69 6,81 6,82 8和 89 6,多样性指数依次为2 33,2 82 ,2 67和 2 75 ;生态优势度下降 ,其值从 0 30 7下降到 0 1 5 8,但并不是演替的最高阶段物种多样性最大 ;通过对群落外貌、结构和种类成分的分析 ,认为封山育林是千岛湖区森林植被进展演替的有效途径 ,目前森林植被正在向演替系列的更高阶段发展 ,同时由于立地质量的差异导致了同一空间存在着不同的演替系列。图 2表 3参 1

The community types in Qiandao Lake were classified into warm coniferous forest,conifer and broad leaved mixed forest,deciduous broad leaved forest,evergreen broad leaved forest by the two dimention polar ordination.The species diversity index,community evenness index and the ecological dominance were compared for different community type.The diversity and evenness indices increased with the plant community succession,the order of the diversity index of the four types of vegetations is 2 33,2 82,2 67 and 2 75,and the order of evenness index is 69 6,81 6,82 8 and 89 6.But the indices of mature forest were not the highest,while the ecological dominance index dicreased from 0 307 to 0 158.In addition,the community physiognomy,structure and the important value of the dominant trees were analyzed.The result showed that forest reservation was an effective measure for vegetation restoration and rehabilitation.Meanwile,the different site quality caused the different successional series in the same space.