Plant communities mediate the interactive effects of invasion and drought on soil microbial communities
Plant communities mediate the interactive effects of invasion and drought on soil microbial communities
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DOI：
10.1038/s41396-020-0614-6
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发表时间：
2020-02-19
期刊：
影响因子：
11
通讯作者：
Flory, S. Luke
中科院分区：
文献类型：
--
作者：
Fahey, Catherine;Koyama, Akihiro;Flory, S. Luke
土壤微生物群落在生态系统应对不断加剧的人为全球变化中发挥着重要作用。然而，我们目前对土壤微生物如何应对相互作用的全球变化因素以及植物群落结构的变化是否会介导土壤微生物的反应知之甚少。我们使用了一个现场实验，以评估在土壤中的真菌和细菌群落的变化，植物入侵，实验干旱，以及它们的组合。此外，我们评估了入侵和干旱的直接与间接途径的相对重要性，通过相关的植物群落结构方程模型的变化。我们发现，真菌群落的入侵和干旱，其中真菌丰富度是最低的入侵环境条件下，但最高的入侵在干旱条件下的交互式结构。细菌丰富度在干旱下较低，但不受入侵。植物群落的变化，包括较低的植物丰富度和较高的根生物量，缓和了入侵对微生物丰富度的直接影响。真菌和细菌的功能群，包括病原菌，互惠，氮代谢，也受到植物群落变化的影响。总之，植物群落介导了相互作用的全球变化驱动因素对土壤微生物群落结构的影响，对群落动态和生态系统功能具有重要的潜在影响。
Soil microbiomes could play a major role in ecosystem responses to escalating anthropogenic global change. However, we currently have a poor understanding of how soil microbes will respond to interacting global change factors and if responses will be mediated by changes in plant community structure. We used a field experiment to assess changes in soil fungal and bacterial communities in response to plant invasion, experimental drought, and their combination. In addition, we evaluated the relative importance of direct versus indirect pathways of invasion and drought through changes in associated plant communities with structural equation models. We found that fungal communities were interactively structured by invasion and drought, where fungal richness was lowest with invasion under ambient conditions but highest with invasion under drought conditions. Bacterial richness was lower under drought but unaffected by invasion. Changes in the plant community, including lower plant richness and higher root biomass, moderated the direct effects of invasion on microbial richness. Fungal and bacterial functional groups, including pathogens, mutualists, and nitrogen metabolizers, were also influenced by plant community changes. In sum, plant communities mediated the effects of interacting global change drivers on soil microbial community structure, with significant potential consequences for community dynamics and ecosystem functions.