Nitrate Addition Increases the Activity of Microbial Nitrogen Removal in Freshwater Sediment.
Nitrate Addition Increases the Activity of Microbial Nitrogen Removal in Freshwater Sediment.
复制标题
添加硝酸盐可提高淡水沉积物中微生物脱氮的活性
DOI：
10.3390/microorganisms10071429
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发表时间：
2022-07-15
期刊：
影响因子：
4.5
通讯作者：
中科院分区：
文献类型：
--
作者：
反硝化作用和厌氧氨氧化作用广泛存在于水生生态系统中，对氮污染的去除起着重要作用。然而，小水体对外部影响很敏感;携带营养物质和氧气的雨水径流流入水体，导致地球化学和微生物过程中断。尽管如此，很少有人知道这些短期的外部输入如何影响微生物过程中的氮去除小水体。为研究NO3-、NH 4+、溶解氧（DO）和有机碳对池塘沉积物中微生物脱氮的影响，采用泥浆培养实验和15 N示踪技术进行了调控实验。结果表明，NO3−（50至800 μmol L−1）的加入显著促进了反硝化速率，正如Michaelis-Menten动力学所预期的那样。上覆水中NO3−浓度较高的池塘对NO3−添加的反应更大。此外，N2 O的产生也被这样的NO3-的添加所促进。DO浓度从0升高到2 mg L-1显著抑制反硝化作用，之后没有观察到抑制作用的显著增加。有机碳的引入提高了反硝化速率。由于池塘沉积物中含有丰富的NH 4+，投加氨氮对氮的去除影响不大。此外，厌氧氨氧化率没有显着变化的任何修正案。
Denitrification and anammox occur widely in aquatic ecosystems serving vital roles in nitrogen pollution removal. However, small waterbodies are sensitive to external influences; stormwater runoff carrying nutrients and oxygen, flows into waterbodies resulting in a disruption of geochemical and microbial processes. Nonetheless, little is known about how these short-term external inputs affect the microbial processes of nitrogen removal in small waterbodies. To investigate the effects of NO3−, NH4+, dissolved oxygen (DO) and organic C on microbial nitrogen removal in pond sediments, regulation experiments have been conducted using slurry incubation experiments and 15N tracer techniques in this study. It was demonstrated the addition of NO3− (50 to 800 μmol L−1) significantly promoted denitrification rates, as expected by Michaelis-Menten kinetics. Ponds with higher NO3− concentrations in the overlying water responded more greatly to NO3− additions. Moreover, N2O production was also promoted by such an addition of NO3−. Denitrification was significantly inhibited by the elevation of DO concentration from 0 to 2 mg L−1, after which no significant increase in inhibition was observed. Denitrification rates increased when organic C was introduced. Due to the abundant NH4+ in pond sediments, the addition demonstrated little influence on nitrogen removal. Moreover, anammox rates showed no significant changes to any amendment.
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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：
4
作者：
Cai，Min;Li，Shuai;Wang，Yu
通讯作者：
Wang，Yu
磺胺二甲嘧啶对河口和沿海沉积物反硝化及相关 N2O 释放的影响
影响因子：
11.4
作者：
Hou, Lijun;Yin, Guoyu;Tong, Chunfu
通讯作者：
Tong, Chunfu
影响因子：
5.2
作者：
Holgerson, Meredith A.;Zappa, Christopher J.;Raymond, Peter A.
通讯作者：
Raymond, Peter A.
影响因子：
4.4
作者：
Henderson, Sherri L.;Dandie, Catherine E.;Goyer, Claudia
通讯作者：
Goyer, Claudia