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首页> 外文期刊>Botanical Journal of the Linnean Society >Floristics of the dunbar valley serpentinite site, Songimvelo game reserve, South Africa
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Floristics of the dunbar valley serpentinite site, Songimvelo game reserve, South Africa

机译：南非邓伊姆维洛禁猎区，邓巴谷蛇纹石遗址的植物区系

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摘要

The Dunbar Valley serpentinite outcrop has a flora comprising 254 taxa (species and below) in 172 genera and 63 families. Dunbar Valley has more species than other studied serpentinite sites in the Barberton Greenstone Belt (BGB). The genus Senecio is the most speciose genus in the BGB. The level of species endemism at Dunbar Valley is 2.0%. Most of the serpentinite endemics in the BGB show phytogeographical affinities with the Sudano-Zambezian Region. Six modified-Whittaker plots, three on serpentinite and three on non-serpentinite soils, were sampled. Sorenson's index was 0.312, indicating low similarity in species between serpentinite and non-serpentinite sites (beta-diversity) at Dunbar Valley, as at other sites in the BGB. alpha-diversity (using the Shannon-Wiener index) for the serpentinite was 2.631 +/- 0.901 and for the non-serpentinite, 2.886 +/- 0.130. However, a Student's t-test showed no significant difference in alpha-diversity between the two habitats. There was also no significant difference in species richness between serpentinite and non-serpentinite sites. Total species showed negative correlations with total nickel, altitude and serpentinite outcrop size (area) for six sites in the BGB. Number of endemic taxa showed no correlation with environmental variables.
机译：邓巴谷蛇纹石露头的植物群包括172个属和63个科的254个分类单元（物种及以下）。邓巴谷（Dunbar Valley）的物种比巴伯顿绿石带（BGB）中其他研究过的蛇纹岩遗址多。千里光属是BGB中最特殊的属。邓巴谷地区的物种特有度为2.0％。 BGB中的大多数蛇纹岩特有种都显示出与Sudano-Zambezian地区的植物地理亲缘关系。采样了六个修改后的Whittaker样地，其中三个在蛇纹石上，三个在非蛇纹石上。索伦森指数为0.312，表明邓巴谷的蛇纹岩和非蛇纹石站点之间的物种相似度很低（β多样性），与BGB中的其他站点相似。蛇纹石的α-多样性（使用香农-维纳指数）为2.631 +/- 0.901，非蛇纹石的α-多样性为2.886 +/- 0.130。但是，Student's t检验显示两种生境之间的alpha多样性没有显着差异。蛇纹石和非蛇纹石站点之间的物种丰富度也没有显着差异。 BGB中六个地点的总物种与总镍，高度和蛇纹岩露头大小（面积）呈负相关。地方生物分类群的数量与环境变量没有相关性。

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