Grazing weakens competitive interactions between active methanotrophs and nitrifiers modulating greenhouse-gas emissions in grassland soils.
Grazing weakens competitive interactions between active methanotrophs and nitrifiers modulating greenhouse-gas emissions in grassland soils.
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放牧削弱了活性甲烷氧化菌和硝化菌之间的竞争性相互作用，调节草地土壤中的温室气体排放
DOI：
10.1038/s43705-021-00068-2
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发表时间：
2021-12-09
期刊：
影响因子：
--
通讯作者：
Doglioli, Andrea
中科院分区：
文献类型：
--
作者：
Benavides, Mar;Conradt, Louis;Bonnet, Sophie;Berman-Frank, Ilana;Barrillon, Stephanie;Petrenko, Anne;Doglioli, Andrea
草地土壤是温室气体（GHG）甲烷（CH 4）和一氧化二氮（N2 O）的生物汇和源。导致这些温室气体排放的潜在机制，特别是放牧草原土壤中甲烷氧化微生物和氨氧化微生物之间的关系，仍然知之甚少。在这里，我们的特点是放牧对原位温室气体排放的影响，并阐明了草地土壤中甲烷氧化和硝化活性的活性微生物之间的关系。14个月的原位观测结果表明，放牧显著降低了CH4的吸收，增加了N2O的排放。基于DNA的稳定同位素探针（SIP）培养实验表明，放牧降低了草地土壤甲烷氧化和硝化过程，降低了活性甲烷氧化菌和硝化菌的多样性，从而削弱了活性甲烷氧化菌和硝化菌之间的竞争.这些结果构成了一个重大的进步，在我们的理解之间的推定关系甲烷和氨氧化微生物和随后的硝化和甲烷氧化的影响，这有助于更好地预测和模拟未来的温室气体排放平衡和活跃的微生物群落在放牧草地生态系统。
Grassland soils serve as a biological sink and source of the potent greenhouse gases (GHG) methane (CH4) and nitrous oxide (N2O). The underlying mechanisms responsible for those GHG emissions, specifically, the relationships between methane- and ammonia-oxidizing microorganisms in grazed grassland soils are still poorly understood. Here, we characterized the effects of grazing on in situ GHG emissions and elucidated the putative relations between the active microbes involving in methane oxidation and nitrification activity in grassland soils. Grazing significantly decreases CH4 uptake while it increases N2O emissions basing on 14-month in situ measurement. DNA-based stable isotope probing (SIP) incubation experiment shows that grazing decreases both methane oxidation and nitrification processes and decreases the diversity of active methanotrophs and nitrifiers, and subsequently weakens the putative competition between active methanotrophs and nitrifiers in grassland soils. These results constitute a major advance in our understanding of putative relationships between methane- and ammonia-oxidizing microorganisms and subsequent effects on nitrification and methane oxidation, which contribute to a better prediction and modeling of future balance of GHG emissions and active microbial communities in grazed grassland ecosystems.
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