Biogeography and impact of nitrous oxide reducers in rivers across a broad environmental gradient on emission rates

IF 4.3 2区 生物学 Q2 MICROBIOLOGY Environmental microbiology Pub Date : 2024-05-16 DOI:10.1111/1462-2920.16622
Sibo Zhang, Xinghui Xia, Leilei Yu, Shaoda Liu, Xiaokang Li, Junfeng Wang, Yue Zheng, Lanfang Han, Qian Tan, Zhifeng Yang
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Abstract

Microbial communities that reduce nitrous oxide (N2O) are divided into two clades, nosZI and nosZII. These clades significantly differ in their ecological niches and their implications for N2O emissions in terrestrial environments. However, our understanding of N2O reducers in aquatic systems is currently limited. This study investigated the relative abundance and diversity of nosZI- and nosZII-type N2O reducers in rivers and their impact on N2O emissions. Our findings revealed that stream sediments possess a high capacity for N2O reduction, surpassing N2O production under high N2O/NO3- ratio conditions. This study, along with others in freshwater systems, demonstrated that nosZI marginally dominates more often in rivers. While microbes containing either nosZI and nosZII were crucial in reducing N2O emissions, the net contribution of nosZII-containing microbes was more significant. This can be attributed to the nir gene co-occurring more frequently with the nosZI gene than with the nosZII gene. The diversity within each clade also played a role, with nosZII species being more likely to function as N2O sinks in streams with higher N2O concentrations. Overall, our findings provide a foundation for a better understanding of the biogeography of stream N2O reducers and their effects on N2O emissions.

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大环境梯度河流中氧化亚氮还原剂的生物地理学及其对排放率的影响
减少一氧化二氮(N2O)的微生物群落分为两个支系:nosZI 和 nosZII。这两个支系在生态位和对陆地环境中一氧化二氮排放的影响方面存在很大差异。然而,目前我们对水生系统中 N2O 还原剂的了解还很有限。本研究调查了河流中 nosZI 型和 nosZII 型氧化亚氮还原剂的相对丰度和多样性及其对氧化亚氮排放的影响。我们的研究结果表明,河流沉积物具有很强的 N2O 还原能力,在高 N2O/NO3- 比率条件下,其生成量超过了 N2O 生成量。这项研究以及在淡水系统中进行的其他研究表明,nosZI 在河流中更多地占据微弱优势。虽然含有 nosZI 和 nosZII 的微生物在减少 N2O 排放方面至关重要,但含有 nosZII 的微生物的净贡献更为显著。这可能是因为 nir 基因与 nosZI 基因共存的频率高于与 nosZII 基因共存的频率。每个支系内部的多样性也起到了一定作用,在 N2O 浓度较高的溪流中,nosZII 物种更有可能发挥 N2O 汇的作用。总之,我们的发现为更好地了解溪流一氧化二氮还原剂的生物地理学及其对一氧化二氮排放的影响奠定了基础。
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来源期刊
Environmental microbiology
Environmental microbiology 环境科学-微生物学
CiteScore
9.90
自引率
3.90%
发文量
427
审稿时长
2.3 months
期刊介绍: Environmental Microbiology provides a high profile vehicle for publication of the most innovative, original and rigorous research in the field. The scope of the Journal encompasses the diversity of current research on microbial processes in the environment, microbial communities, interactions and evolution and includes, but is not limited to, the following: the structure, activities and communal behaviour of microbial communities microbial community genetics and evolutionary processes microbial symbioses, microbial interactions and interactions with plants, animals and abiotic factors microbes in the tree of life, microbial diversification and evolution population biology and clonal structure microbial metabolic and structural diversity microbial physiology, growth and survival microbes and surfaces, adhesion and biofouling responses to environmental signals and stress factors modelling and theory development pollution microbiology extremophiles and life in extreme and unusual little-explored habitats element cycles and biogeochemical processes, primary and secondary production microbes in a changing world, microbially-influenced global changes evolution and diversity of archaeal and bacterial viruses new technological developments in microbial ecology and evolution, in particular for the study of activities of microbial communities, non-culturable microorganisms and emerging pathogens
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