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首页> 外文期刊>Mycologia >Vertical distribution of fungal communities in tallgrass prairie soil.
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Vertical distribution of fungal communities in tallgrass prairie soil.

机译：高草草原土壤中真菌群落的垂直分布。

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We used 454 sequencing of the internal transcribed spacer region to characterize fungal communities in tallgrass prairie soils subdivided into strata 0-10, 10-20, 30-40 and 50-60 cm deep. The dataset included more than 14 000 fungal sequences distributed across Basidiomycota, Ascomycota, basal fungal lineages and Glomeromycota in order of decreasing frequency. As expected the community richness and diversity estimators tended to decrease with increasing depth. Although species richness was significantly reduced for samples from the deeper profiles, even the deepest stratum sampled contained richness of more than a third of that in the topmost stratum. More importantly, nonparametric multidimensional scaling (NMS) ordination analyses indicated that the fungal communities differed across vertical profiles, although only the topmost and deepest strata were significantly different when the NMS axis scores were compared by ANOVA. These results emphasize the importance of considering the fungal communities across the vertical strata because the deeper soil horizons might maintain a distinct community composition and thus contribute greatly to overall richness. The majority of operational taxonomic units (OTUs) declined in frequency with increasing depth, although a linear regression analysis indicated that some increased with increasing depth. The OTUs and BLAST-assigned taxa that showed increasing frequencies were mainly unculturable fungi, but some showed likely affinities to families Nectriaceae and Venturiaceae or to genus Pachnocybe. Although the ecological roles of the fungi in the deeper strata remain uncertain, we hypothesize that the fungi with preferences for deeper soil have adequate access to substrates and possess environmental tolerances that enable their persistence in those environments.Digital Object Identifier http://dx.doi.org/10.3852/09-316
机译：我们使用内部转录间隔区的454测序来表征高草草原土壤中的真菌群落，该土壤细分为0-10、10-20、30-40和50-60厘米深的地层。该数据集包括分布在担子菌，子囊菌，基底真菌谱系和球菌中的14000多个真菌序列，其频率递减。正如预期的那样，社区的丰富度和多样性估计数倾向于随着深度的增加而减少。尽管从更深的剖面来看，样品的物种丰富度显着降低，但即使是最深的采样层，其丰富度也超过了最顶层的三分之一。更重要的是，非参数多维定标（NMS）排序分析表明，真菌群落在垂直剖面上有所不同，尽管在使用ANOVA比较NMS轴得分时，只有最顶层和最深层显着不同。这些结果强调了考虑整个垂直地层的真菌群落的重要性，因为较深的土壤层可能会保持独特的群落组成，从而极大地促进了总体丰富度。大多数操作生物分类单位（OTU）的频率随着深度的增加而下降，尽管线性回归分析表明，有些随着深度的增加而增加。 OTU和BLAST分配的分类单元显示频率增加，主要是不可培养的真菌，但有些显示可能与Nectriaceae和Venturiaceae家族或 Pachnocybe 属相似。尽管真菌在较深地层中的生态作用仍不确定，但我们假设偏爱较深土壤的真菌具有足够的基质接触能力，并具有允许其在这些环境中持久存在的环境耐受性.Digital Object Identifier http：// dx。 doi.org/10.3852/09-316

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