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首页> 外文期刊>The Science of the Total Environment >Increasing aridity affects soil archaeal communities by mediating soil niches in semi-arid regions
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Increasing aridity affects soil archaeal communities by mediating soil niches in semi-arid regions

机译：干旱增加通过介导半干旱地区的土壤生态位而影响土壤古细菌群落

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Soil archaea plays a vital role in the functioning of dryland ecosystems, which are expected to expand and get drier in the future as a result of climate change. However, compared with bacteria and fungi, the impacts of increasing aridity on archaea in these ecosystems remain largely unknown. Here, soil samples were collected along a typical aridity gradient in semi-arid regions in Inner Mongolia, China, to investigate whether and how the increasing aridity affects archaeal communities. The results showed that archaeal richness linearly decreased with increasing aridity. After partialling out the effects of soil properties based on partial least squares regression, the significant aridity-richness relationship vanished. The composition of archaeal communities was distributed according to the aridity gradient. These variations were largely driven by the changes in the relative abundance of Thaumarchaeota, Euryarchaeota and unclassified phyla. Niche-based processes were predominant in structuring the observed archaeal aridity-related pattern. The structural equation models further showed that aridity indirectly reduced archaeal richness through improving soil electrical conductivity (EC) and structured community composition by changing soil total nitrogen (TN). These results suggested that soil salinization and N-losses might be important mechanisms underlying the increasing aridity-induced alterations in archaeal communities, and highlighted the importance of soil niches in mediating the indirect impacts of increasing aridity on archaea. (c) 2018 Elsevier B.V. All rights reserved.
机译：土壤古细菌在旱地生态系统的功能中起着至关重要的作用，由于气候变化，旱地生态系统有望在未来扩大并变得更干燥。但是，与细菌和真菌相比，干旱在这些生态系统中对古细菌的影响仍然未知。在这里，在中国内蒙古半干旱地区，按照典型的干旱梯度收集土壤样品，以调查干旱的增加是否以及如何影响古细菌群落。结果表明，古细菌的丰富度随着干旱的增加呈线性下降。在基于偏最小二乘回归分析了土壤性质的影响之后，明显的干旱-丰富度关系消失了。古细菌群落的组成根据干旱梯度分布。这些变异很大程度上是由Thaumarchaeota，Euryarchaeota和未分类门的相对丰度的变化驱动的。基于生态位的过程在构建观察到的古细菌干旱相关模式方面占主导地位。结构方程模型进一步表明，干旱通过改变土壤总氮（TN）来提高土壤电导率（EC）和结构化群落组成，从而间接降低了古生菌的丰富度。这些结果表明，土壤盐碱化和氮损失可能是干旱引起的古细菌群落变化增加的重要机制，并强调了土壤生态位在调解干旱对古细菌间接影响中的重要性。 （c）2018 Elsevier B.V.保留所有权利。

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