Microbial community response to a decade of simulated global changes depends on the plant community
Microbial community response to a decade of simulated global changes depends on the plant community
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DOI：
10.1525/elementa.2021.00124
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发表时间：
2021-01-01
影响因子：
3.9
通讯作者：
Martiny, Jennifer B. H.
中科院分区：
文献类型：
--
作者：
Finks, Sarai S.;Weihe, Claudia;Martiny, Jennifer B. H.
全球变化，如干旱增加和大气氮沉降，扰乱了调节陆地生态系统功能的微生物和植物群落。然而，很少有研究考虑微生物对全球变化的反应如何受到与植物群落相互作用的影响。为了开始解决微生物-植物相互作用的作用，我们测试了微生物群落对全球变化的反应取决于植物群落的假设。我们从洛马岭全球变化实验（Loma Ridge Global Change Experiment）中采集的395个植物凋落物样本中分析了细菌和真菌群落的特征。洛马岭全球变化实验是在南加州进行的一项长达十年的全球变化实验，该实验操纵了两个相邻生态系统（草地和沿海鼠尾草灌木丛）的降雨和氮水平。不同生态系统间细菌和真菌组成的差异与植物群落组成的差异是平行的。除了直接的主要影响外，全球变化还以依赖生态系统的方式改变了微生物组成，这支持了我们的假设。干旱处理和生态系统之间的相互作用解释了近5%的细菌群落组成变化，与干旱对生态系统无关的影响解释的变化相似。出乎意料的是，我们发现干旱对细菌组成的主要影响大约是氮添加的四倍，而氮添加并未改变真菌或植物组成。总的来说，这些发现强调了在考虑全球变化实验结果跨生态系统的可转移性时考虑植物-微生物相互作用的重要性。
Global changes such as increased drought and atmospheric nitrogen deposition perturb both the microbial and plant communities that mediate terrestrial ecosystem functioning. However, few studies consider how microbial responses to global changes may be influenced by interactions with plant communities. To begin to address the role of microbial-plant interactions, we tested the hypothesis that the response of microbial communities to global change depends on the plant community. We characterized bacterial and fungal communities from 395 plant litter samples taken from the Loma Ridge Global Change Experiment, a decade-long global change experiment in Southern California that manipulates rainfall and nitrogen levels across two adjacent ecosystems, a grassland and a coastal sage scrubland. The differences in bacterial and fungal composition between ecosystems paralleled distinctions in plant community composition. In addition to the direct main effects, the global change treatments altered microbial composition in an ecosystem-dependent manner, in support of our hypothesis. The interaction between the drought treatment and ecosystem explained nearly 5% of the variation in bacterial community composition, similar to the variation explained by the ecosystem-independent effects of drought. Unexpectedly, we found that the main effect of drought was approximately four times as strong on bacterial composition as that of nitrogen addition, which did not alter fungal or plant composition. Overall, the findings underscore the importance of considering plant-microbe interactions when considering the transferability of the results of global change experiments across ecosystems.