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Biogeography and impact of nitrous oxide reducers in rivers across a broad environmental gradient on emission rates
Environmental Microbiology ( IF 4.3 ) Pub Date : 2024-05-17 , DOI: 10.1111/1462-2920.16622
Sibo Zhang 1, 2 , Xinghui Xia 3 , Leilei Yu 3 , Shaoda Liu 3 , Xiaokang Li 4 , Junfeng Wang 3 , Yue Zheng 5 , Lanfang Han 1, 2 , Qian Tan 1, 2 , Zhifeng Yang 1, 2
Affiliation  

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.

中文翻译:


生物地理学和跨越广泛环境梯度的河流中一氧化二氮还原剂对排放率的影响



减少一氧化二氮(N 2 O)分为两个进化枝,号Z我和号Z二.这些进化枝在生态位及其对氮的影响方面存在显着差异2陆地环境中的 O 排放。然而,我们对N的理解2目前水生系统中的 O 减少剂是有限的。本研究调查了号Z我-和号Z II型N型2河流中的 O 还原剂及其对 N 的影响2氧气排放。我们的研究结果表明,河流沉积物具有很高的氮容量2 O减少量,超越N 2高氮条件下产氧量2常开/常开3 ‐ 比率条件。这项研究以及淡水系统中的其他研究表明号Z我在河流中更经常占据优势。虽然微生物含有号Z我和号Z II 对于减少 N 至关重要2 O排放量,净贡献号Z含II的微生物更为显着。这可以归因于尼尔基因与以下基因同时出现的频率更高号Z我的基因比同号Z Ⅱ基因。每个分支内部的多样性也发挥了作用,号Z II 物种更有可能发挥 N 的作用2 O 在氮含量较高的溪流中下沉2氧气浓度。 总的来说,我们的研究结果为更好地理解 N 流的生物地理学奠定了基础2 O还原剂及其对N的影响2氧气排放。
更新日期:2024-05-17
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