Identifying the microbial taxa that consistently respond to soil warming across time and space
Identifying the microbial taxa that consistently respond to soil warming across time and space
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DOI：
10.1111/gcb.13557
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发表时间：
2017-05-01
影响因子：
11.6
通讯作者：
Fierer, Noah
中科院分区：
文献类型：
--
作者：
Oliverio, Angela M.;Bradford, Mark A.;Fierer, Noah
土壤微生物群落是许多陆地生态地球化学过程的关键驱动力。然而，我们目前缺乏对这些土壤群落将如何应对全球气温预测上升而发生变化以及哪些微生物谱系将受到最大影响的普遍理解。在这里，使用从北美18个地点收集的土壤的高通量标记基因测序，包括在100天的实验室孵育实验中，我们确定了一组丰富的和几乎无处不在的土壤微生物的核心，随着土壤温度的升高，相对丰度发生变化。然后，我们通过将该实验室实验的结果与210种土壤的数据进行比较，验证并缩小了我们的温度敏感微生物列表，这些土壤代表了多个独立的全球实地研究，这些研究在空间梯度上进行采样，平均年温度范围很广。我们的研究结果揭示了可预测的和一致的温度反应的核心组189无处不在的土壤细菌和古菌类群，这些类群在广泛的土壤类型表现出类似的温度反应。这些微生物“生物指标”有助于了解土壤微生物群落如何对变暖作出反应，并区分土壤变暖对微生物群落的直接和间接影响。那些被发现对温度敏感的类群代表了广泛的谱系，温度响应的方向不能单独从系统发育预测，这表明温度响应很难从简单地描述土壤微生物群落在广泛的分类或系统发育水平的分辨率预测。总之，这些结果奠定了基础，更预测性地了解土壤微生物群落如何应对土壤变暖，以及变暖如何最终导致土壤生物地球化学过程的变化。
Soil microbial communities are the key drivers of many terrestrial biogeochemical processes. However, we currently lack a generalizable understanding of how these soil communities will change in response to predicted increases in global temperatures and which microbial lineages will be most impacted. Here, using high-throughput marker gene sequencing of soils collected from 18 sites throughout North America included in a 100-day laboratory incubation experiment, we identified a core group of abundant and nearly ubiquitous soil microbes that shift in relative abundance with elevated soil temperatures. We then validated and narrowed our list of temperature-sensitive microbes by comparing the results from this laboratory experiment with data compiled from 210 soils representing multiple, independent global field studies sampled across spatial gradients with a wide range in mean annual temperatures. Our results reveal predictable and consistent responses to temperature for a core group of 189 ubiquitous soil bacterial and archaeal taxa, with these taxa exhibiting similar temperature responses across a broad range of soil types. These microbial ` bioindicators' are useful for understanding how soil microbial communities respond to warming and to discriminate between the direct and indirect effects of soil warming on microbial communities. Those taxa that were found to be sensitive to temperature represented a wide range of lineages and the direction of the temperature responses were not predictable from phylogeny alone, indicating that temperature responses are difficult to predict from simply describing soil microbial communities at broad taxonomic or phylogenetic levels of resolution. Together, these results lay the foundation for a more predictive understanding of how soil microbial communities respond to soil warming and how warming may ultimately lead to changes in soil biogeochemical processes.