钱江源国家公园珍稀植物长柄双花木群落结构及物种多样性分析

    Community structure and species diversity of rare plant Disanthus cercidifolius var. longipes in Qianjiangyuan National Park

    • 摘要: 了解珍稀植物长柄双花木群落结构,可为该物种保护提供基础。以钱江源国家公园长柄双花木Disanthus cercidifolius var. longipes群落为对象,采用标准样地法研究了该群落的植物种类组成、数量特征、物种多样性、群落的垂直和径阶结构。结果表明: 长柄双花木群落共有维管束植物108种,隶属于47科88属;群落垂直结构明显,乔木层优势树种为长柄双花木和杉木Cunninghamia lanceolata,灌木层优势种有窄基红褐柃Eurya rubiginosa var. attenuata、矩形叶鼠刺Itea chinensis var. oblonga、薄叶山矾Symplocos anomala,草本层则以狗脊蕨Woodwardia japonica为优势种;群落中植物的生活型以高位芽植物数量最多,占85.2%;地理成分以泛热带科、属为最多,分别占科、属总数的20.90%、20.78%;植物的Shannon-Wiener 多样性指数、Simpson 优势度指数和Pielou 均匀度指数均表现为乔木层>灌木层>草本层;群落的树高和径阶结构均为倒“J”字型,长柄双花木单一种的径阶分布则呈现正偏态分布。综上,钱江源国家公园长柄双花木群落为成熟稳定的结构,更新状态良好,长柄双花木单一种处于增长型种群演替阶段。

       

      Abstract: Understanding the community structure of the rare plant Disanthus cercidifolius var. longipes can provide a basis for the conservation of this species.Using standard plot method, the plant species, quantitative characteristics, species diversity and vertical and radial structure of the Disanthus cercidifolius var. longipes community in Qiangjiangyuan National Park were studied. The results showed that the plant species in the community were rich, with 108 vascular plant species belonging to 47 families and 88 genera; the vertical structure was obvious, with Cunninghamia lanceolata and D. cercidifolius var. longipes as the dominant species in the canopy layer, Eurya rubiginosa var. attenuata, Itea chinensis var. oblonga and Symplocos anomala as the dominant species in the shrub layer, and Woodwardia japonica as the dominant species in the herb layer; the life form of plants with the highest number of terminal buds was 85.2%; the geographical components with the highest number of species were the subtropical genera and families, accounting for 20.90% and 20.78% of the total, respectively; the Shannon-Wiener diversity index, Simpson dominance index and Pielou evenness index all showed that the canopy layer was greater than the shrub layer and the herb layer; the tree height and diameter structure of the community were inverted "J"-shaped, and the diameter distribution of D. cercidifolius var. longipes alone was positively skewed. In summary, The community of D.cercidifolius var. longipes in Qianjiangyuan National Park has a mature and stable structure, and its renewal status is good. The single species of D. cercidifolius var. longipes is in the stage of population succession of the increasing type.

       

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