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首页> 外文期刊>Applied Microbiology >Impact of Land Use on Arbuscular Mycorrhizal Fungal Communities in Rural Canada
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Impact of Land Use on Arbuscular Mycorrhizal Fungal Communities in Rural Canada

机译：土地使用对加拿大农村地区丛枝菌根真菌社区的影响

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The influence of land use on soil bio-resources is largely unknown. We examined the communities of arbuscular mycorrhizal (AM) fungi in wheat-growing cropland, natural areas, and seminatural areas along roads. We sampled the Canadian prairie extensively (317 sites) and sampled 20 sites in the Atlantic maritime ecozone for comparison. The proportions of the different AM fungal taxa in the communities found at these sites varied with land use type and ecozones, based on pyrosequencing of 18S rRNA gene (rDNA) amplicons, but the lists of AM fungal taxa obtained from the different land use types and ecozones were very similar. In the prairie, the Glomeraceae family was the most abundant and diverse family of Glomeromycota, followed by the Claroideoglomeraceae, but in the Atlantic maritime ecozone, the Claroideoglomeraceae family was most abundant. In the prairie, species richness and Shannon's diversity index were highest in roadsides, whereas cropland had a higher degree of species richness than roadsides in the Atlantic maritime ecozone. The frequencies of occurrence of the different AM fungal taxa in croplands in the prairie and Atlantic maritime ecozones were highly correlated, but the AM fungal communities in these ecozones had different structures. We conclude that the AM fungal resources of soils are resilient to disturbance and that the richness of AM fungi under cropland management has been maintained, despite evidence of a structural shift imposed by this type of land use. Roadsides in the Canadian prairie are a good repository for the conservation of AM fungal diversity.
机译：土地使用对土壤生物资源的影响在很大程度上尚不清楚。我们检查了小麦种植农田，自然地区和道路上的半自然地区的丛枝菌根（AM）真菌群落。我们对加拿大大草原进行了广泛采样（317个站点），并在大西洋海洋生态区中采样了20个站点进行比较。根据18S rRNA基因（rDNA）扩增子的焦磷酸测序，在这些地点发现的群落中不同AM真菌类群的比例随土地利用类型和生态区而异，但从不同土地利用类型和生态区非常相似。在大草原，Glomeraceae家族是Glomeromycota家族中数量最多，种类最多的，其次是Claroideoglomeraceae，但在大西洋海洋生态区中，Claroideoglomeraceae家族数量最多。在草原上，路边的物种丰富度和香农多样性指数最高，而大西洋海洋生态区中的农田比路边的物种丰富度更高。草原和大西洋海洋生态区农田中不同AM真菌类群的发生频率高度相关，但这些生态区的AM真菌群落结构不同。我们得出结论，尽管有证据表明此类土地利用会引起结构性变化，但土壤的AM真菌资源具有抗干扰的能力，并且在农田管理下AM真菌的丰富性得以保持。加拿大大草原的路边是保存AM真菌多样性的好地方。

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