石蒜生长对杂草群落组成及物种多样性的影响

Influence of Lycoris radiata Growth on the Composition and Diversity of Weed Communities

摘要:

通过野外调查，研究了石蒜(Lycoris radiata)对群落杂草组成和物种多样性的影响。结果表明：石蒜的生长能减少群落中物种的种类，降低群落中杂草的密度，并减少商陆(Phytolacca acinosa)、蹄盖蕨(Athyrium frizellia)及禾本科(Gramineae)几个物种的数量，群落的物种多样性指数降低，群落均匀度提高。群落相似度与没有石蒜分布的群落相比显著降低。说明石蒜改变了杂草的群落结构，有利于限制杂草的发生危害。

Abstract:

The field investigation was carried out in the communities, in which Lycoris radiata was distributed. The result showed as following: (1) Species composition of the communities and weed density were decreased by the growth of L. radiate. (2) Population density of Phytolacca acinosa, Athyrium frizellia and some species of Gramineae were rapidly decreased as well, which reduced the indecies of species diversity and increased the evenness of weed communities. (3) Indecies of Jaccard’s and Sorensen’s similarity of the communities, where L. radiata was distributed, were significantly different from those without L. radiata. All these indicated that L. radiata obviously changed the composition and structure of weed communities, and effectively controlled the growth of weeds.