Ecological Distribution and Diversity of Key Functional Genes for Denitrification in Surface Sediments of the Northern South China Sea: Implications for Potential N2O Emissions
Ecological Distribution and Diversity of Key Functional Genes for Denitrification in Surface Sediments of the Northern South China Sea: Implications for Potential N2O Emissions
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南海北部表层沉积物反硝化关键功能基因的生态分布和多样性：对潜在 N2O 排放的影响
DOI：
10.3389/fmars.2022.912402
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发表时间：
2022-06
影响因子：
3.7
通讯作者：
Aimin Long
中科院分区：
文献类型：
--
作者：
Hua Xiang;Yiguo Hong;Jiapeng Wu;Aimin Long
反硝化作用是氮汇和N 2 O排放的重要途径，但海洋沉积物中反硝化作用关键功能基因的生态分布及其潜在N 2 O排放的研究知之甚少。本研究分析了南海北方表层沉积物中反硝化关键功能基因nir和nosZ的丰度、生态分布和多样性。结果表明，nir S和nir K的基因丰度分别为10 5 ~ 10 8和10 6 ~ 10 7拷贝·g-1。nos Z II/ nos Z I基因丰度比在浅海和深海沉积物中为1.28-9.88，表明南海北方沉积物中nos Z II基因在N2 O还原中起主导作用。此外，nir /nosZ在深海表层沉积物中的丰度比明显高于浅海表层沉积物，这表明深海沉积物可能比浅海沉积物具有更强的N2 O排放潜力。nir S、nos Z I和nos Z II基因群落的生态分布随水深变化而变化，浅海和深海沉积物中反硝化基因对环境因子的敏感性不同。水温是影响深海沉积物中nir S基因丰度和群落分布的主要因素。硝酸盐是形成浅海沉积物中nos Z I和nos Z II基因群落的主要因素。我们的研究提供了nir和nosZ基因的生态分布和多样性模式，并强调了这些关键功能基因在南海北方表层沉积物潜在N2 O排放中的作用。
Denitrification is an important pathway for nitrogen sink and N 2 O emissions, but little is known about the ecological distribution of key functional genes of denitrification and their potential N 2 O emissions in marine sediments. In this study, we analyzed the abundance, ecological distribution, and diversity of key functional genes ( nir and nos Z) for denitrification in the northern South China Sea (SCS) surface sediments. Our results showed that the gene abundances varied from 10 5 to 10 8 and from 10 6 to 10 7 copies·g -1 for the nir S and nir K, respectively. The nos Z II/ nos Z I gene abundance ratios were 1.28–9.88 in shallow-sea and deep-sea sediments, suggesting that the nos Z II gene should play a dominant role in N 2 O reduction in the northern SCS sediments. Moreover, the significantly higher abundance ratios of nir / nos Z in deep-sea surface sediments implied that there might be stronger N 2 O emissions potential in deep-sea sediments than in shallow-sea sediments. The ecological distribution profiles of the nir S, nos Z I, and nos Z II gene communities varied with water depth, and denitrification genes in shallow-sea and deep-sea sediments differed in their sensitivity to environmental factors. Water temperature was the major factor affecting both the abundance and the community distribution of the nir S gene in deep-sea sediments. Nitrate was the major factor shaping the community of nos Z I and nos Z II genes in shallow-sea sediments. Our study provides a pattern of ecological distribution and diversity for the nir and nos Z genes and emphasizes the role of these key functional genes in potential N 2 O emissions of the northern SCS surface sediments.
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影响因子：
5.2
作者：
Domeignoz-Horta LA;Spor A;Bru D;Breuil MC;Bizouard F;Léonard J;Philippot L
通讯作者：
Philippot L
影响因子：
9.7
作者：
Graf, Daniel R. H.;Zhao, Ming;Hallin, Sara
通讯作者：
Hallin, Sara
湖泊中一氧化二氮积累的遗传和环境控制。
影响因子：
3.7
作者：
Saarenheimo J;Rissanen AJ;Arvola L;Nykänen H;Lehmann MF;Tiirola M
通讯作者：
Tiirola M
影响因子：
30.7
作者：
D. Makowski
通讯作者：
D. Makowski
影响因子：
4.4
作者：
S. Hallin;P. Lindgren
通讯作者：
S. Hallin;P. Lindgren