Plant functional diversity and soil properties control elevational diversity gradients of soil bacteria
Plant functional diversity and soil properties control elevational diversity gradients of soil bacteria
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DOI：
10.1093/femsec/fiz025
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发表时间：
2019-02
影响因子：
4.2
通讯作者：
Nobuhiko Shigyo;K. Umeki;T. Hirao
中科院分区：
文献类型：
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作者：
Nobuhiko Shigyo;K. Umeki;T. Hirao
海拔梯度代表了理解土壤微生物群落与环境因素之间关系的模型系统，但植物-土壤联系和气候条件对土壤微生物海拔多样性梯度(EDGs)的多重影响从未被探索过。在这里，我们研究了气候条件、植物多样性和土壤性质如何影响不同土壤深度的土壤细菌的EDG。在日本中部沿海拔梯度的60个植被调查样地中，对4个土壤深度的细菌群落进行了调查。在这项研究中，海拔梯度反映了气候条件，包括年平均温度和温度和降水的季节性。细菌多样性在表层土壤中随海拔升高而降低，而在深层土壤中与海拔无关。结构方程模拟表明，植物功能多样性直接影响土壤细菌多样性，其中叶片C/N比多样性对土壤细菌多样性的影响大于土壤性质。我们发现，土壤细菌的EDGs是由气候条件通过植物功能多样性和土壤性质间接影响的程度决定的，而不是气候条件对细菌多样性的直接影响。这些发现表明，土壤微生物的群落聚集与气候条件、植物功能多样性和土壤性质之间存在因果关系，这些因素决定了生态系统的可持续发展。
Elevational gradients represent model systems for understanding the relationships between soil microbial communities and environmental factors, but the multiple influences of plant-soil linkages and climate conditions on elevational diversity gradients (EDGs) of soil microbes have never been explored. Here, we examined how climate conditions, plant diversity and soil properties affect EDGs of soil bacteria at different soil depths. Bacterial communities were investigated at four soil depths in 60 vegetation survey plots along elevational gradients in central Japan. In this study, elevational gradients reflected climate conditions, including mean annual temperature and seasonality of temperature and precipitation. Bacterial diversity decreased with elevation in the surface soil, but showed no relationship with elevation in deep soils. The structural equation modeling showed that soil bacterial diversity was directly affected by plant functional diversity, where leaf C:N ratio diversity had stronger effects than soil properties. We found that EDGs of soil bacteria were determined by the degree of indirect effects of climate conditions, via plant functional diversity and soil properties, against the direct effect of climate conditions on bacterial diversity. These findings demonstrate that community assembly of soil microbes is causally linked with climate conditions, plant functional diversity and soil properties, which determine EDGs.