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金华南山珍稀濒危植物永瓣藤的群落结构

Community Structure of the Rare and Endangered Plant Monimopetalum chinense in Nanshan area of Jinhua

  • 摘要: 永瓣藤Monimopetalum chinense是国家二级重点保护野生植物,2018 年在金华南山首次记录到其野生分布,为浙江省分布新记录。揭示金华南山永瓣藤的群落结构,可为永瓣藤保护工作提供科学依据。通过对金华南山永瓣藤所在群落开展样方调查,分析了永瓣藤个体数量以及群落物种组成、垂直结构、物种多样性等群落特征。结果表明:永瓣藤个体数量较多,3个分布点共发现186株,低海拔次生灌丛和毛竹Phyllostachys edulis 林内均分布有较多的永瓣藤。该群落共包含84种植物,其中山茶科Theaceae、禾本科Poaceae、樟科Lauraceae 物种数量较多。永瓣藤群落垂直结构较不明显,杉木Cunninghamia lanceolata、毛竹、野漆Toxicodendron succedaneum是乔木层优势种,檵木Loropetalum chinense和阔叶箬竹Indocalamus latifolius是灌木层优势种,淡竹叶Lophatherum gracile、黑足鳞毛蕨Dryopteris fuscipes等是草本层优势植物。群落生物多样性指数均呈现草本层>灌木层>乔木层的规律。综上,金华南山的永瓣藤集中分布于路边次生灌丛和竹林,各物种重要值偏低,处于人为干扰较重的演替过渡阶段。永瓣藤种群可能随着群落向常绿阔叶林的发展而逐渐衰弱,建议采取就地保护为主,结合迁地保护与野化回归等措施进行保护。

     

    Abstract: Monimopetalum chinense, species of ClassⅡstate key protected wild plant in China, was discovered in 2018 in Nanshan area of Jinhua, marking a new distribution record for Zhejiang Province. Unraveling the community structure of M. chinense in this area provides a scientific basis for its conservation. Based on quadrat surveys conducted in the community where M. chinense grows in Nanshan, Jinhua, number of individuals, species composition, vertical structure and species diversity, etc. were analyzed. The results showed that a relatively large number of individuals was found and distributed more abundantly both in low-altitude secondary shrublands and in forests of Phyllostachys edulis, with a total of 186 plants identified across three distribution points. The community contained 84 species of plants, with a higher number of species belonging to the families Theaceae, Poaceae and Lauraceae. The vertical structure of the M. chinense community was not very distinct. The dominant species in tree layer included Cunninghamia lanceolata, P. edulis and Toxicodendron succedaneum, ones in the shrub layer were Loropetalum chinense and Indocalamus latifolius, ones in herbaceous layer covered Lopha therum gracile and Dryopteris fuscipes. The diversity indices of community followed the pattern: herbaceous layer > shrub layer > tree layer. Overall, M. chinense mainly distributed in roadside secondary shrublands and bamboo forests in the Nanshan area of Jinhua is in a transitional stage under the significant human disturbance, with relatively low species importance values. The population of M. chinense may gradually decline as the community develops towards evergreen broad-leaved forest. It is recommended that the priority of conservation should be placed upon in situ conservation, with ex situ measures and reintroduction as compatible choices.

     

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