Nitrogen removal processes coupled with nitrification in coastal sediments off the north East China Sea

Chang, Yen‐Chiang; Yin, Guoyu; Hou, Lijun; Liu, Min; Han, Ping; Dong, Huicong; Liang, Xia; Gao, Dengzhou; Liu, Cheng

doi:10.1007/s11368-021-02964-5

Cited by 16 publications

(4 citation statements)

References 58 publications

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“…In addition, D total was significantly and positively correlated with the abundance of denitrification functional genes nirS and nroB , and R DNRA was also significantly and positively correlated with the abundance of DNRA functional gene nrfA . This conclusion is consistent with the research results of China’s Yangtze River estuary ( Zheng et al, 2021 ), Northeast China Sea ( Chang et al, 2021 ), and high-altitude rivers ( Zhang et al, 2020 ). This further proves that the nitrogen removal process of riparian sediments is mediated by the redox reaction of different microorganisms.…”

Section: Resultssupporting

confidence: 92%

“…Microcosmic experiments showed that there was a coupled Fe-N cycle in the riparian zone, and Fe(II) would promote the attenuation of NO 3 − -N through NDFO action, which reduced the reaction substrate of DNRA and inhibited the DNRA reaction. In contrast, NO 3 − and DOC provided electron acceptors and electron donors, respectively, for the DNRA reaction ( Li Z et al, 2020 ; Chang et al, 2021 ), which facilitated the DNRA reaction.…”

Section: Resultsmentioning

confidence: 99%

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Nitrogen removal in freshwater sediments of riparian zone: N-loss pathways and environmental controls

Ye,

Duan,

Sun

et al. 2023

Front. Microbiol.

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The riparian zone is an important location of nitrogen removal in the terrestrial and aquatic ecosystems. Many studies have focused on the nitrogen removal efficiency and one or two nitrogen removal processes in the riparian zone, and less attention has been paid to the interaction of different nitrogen transformation processes and the impact of in situ environmental conditions. The molecular biotechnology, microcosm culture experiments and 15N stable isotope tracing techniques were used in this research at the riparian zone in Weinan section of the Wei River, to reveal the nitrogen removal mechanism of riparian zone with multi-layer lithologic structure. The results showed that the nitrogen removal rate in the riparian zone was 4.14–35.19 μmol·N·kg−1·h−1. Denitrification, dissimilatory reduction to ammonium (DNRA) and anaerobic ammonium oxidation (anammox) jointly achieved the natural attenuation process of nitrogen in the riparian zone, and denitrification was the dominant process (accounting for 59.6%). High dissolved organic nitrogen and nitrate ratio (DOC:NO3−) would promote denitrification, but when the NO3− content was less than 0.06 mg/kg, DNRA would occur in preference to denitrification. Furthermore, the abundances of functional genes (norB, nirS, nrfA) and anammox bacterial 16S rRNA gene showed similar distribution patterns with the corresponding nitrogen transformation rates. Sedimentary NOX−, Fe(II), dissolved organic carbon (DOC) and the nitrogen transformation functional microbial abundance were the main factors affecting nitrogen removal in the riparian zone. Fe (II) promoted NO3− attenuation through nitrate dependent ferrous oxidation process under microbial mediation, and DOC promotes NO3− attenuation through enhancing DNRA effect. The results of this study can be used for the management of the riparian zone and the prevention and control of global nitrogen pollution.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Nitrogen removal in freshwater sediments of riparian zone: N-loss pathways and environmental controls

Ye,

Duan,

Sun

et al. 2023

Front. Microbiol.

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“…Denitrification rates in the NE New Zealand shelf were lower than those in other Pacific shelves and in the Atlantic Ocean with eutrophic settings. Average rates of surveyed studies in the Pacific of 530 ± 62 μ mol N m −2 d −1 (Christensen et al 2003; Farías et al 2004; Erler et al 2013; Song et al 2016; Na et al 2018; Chang et al 2021; Song et al 2021; Tan et al 2022) and the Atlantic Ocean of 542 ± 139 μ mol N m −2 d −1 (Canfield et al 1993; Lohse et al 1996; Vance‐Harris and Ingall 2005; Trimmer and Nicholls 2009; Fan et al 2015; Sokoll et al 2016; Kitidis et al 2017; Rosales Villa et al 2019) were threefold higher than our rates. In general, it appears that the availability of N sources, in particular NO x − concentrations, can be the potential main driver of denitrification in the majority of these eutrophic shelf sediments (Fig.…”

Section: Discussionmentioning

confidence: 99%

Denitrification, anammox, and DNRA in oligotrophic continental shelf sediments

Cheung,

Hillman,

Pilditch

et al. 2024

Limnology & Oceanography

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Continental shelf sediments are considered hotspots for nitrogen (N) removal. While most investigations have quantified denitrification in shelves receiving large amounts of anthropogenic nutrient supply, we lack insight into the key drivers of N removal on oligotrophic shelves. Here, we measured rates of N removal through denitrification and anammox by the revised‐isotope pairing technique (r‐IPT) along the Northeastern New Zealand shelf. Denitrification dominated total N2 production at depths between 30 and 128 m with average rates (± SE) ranging from 65 ± 28 to 284 ± 72 μmol N m−2 d−1. N2 production by anammox ranged from 3 ± 1 to 28 ± 11 μmol N m−2 d−1 and accounted for 2–19% of total N2 production. DNRA was negligible in these oligotrophic settings. Parallel microbial community analysis showed that both Proteobacteria and Planctomycetota were key taxa driving denitrification. Denitrification displayed a negative correlation with oxygen penetration depth, and a positive correlation with macrofauna abundance. Our denitrification rates were comparable to oligotrophic shelves from the Arctic, but were lower than those from nutrient‐rich Pacific and Atlantic shelves. Based on our results and existing IPT measurements, the global shelf denitrification rate was reassessed to be 53.5 ± 8.1 Tg N yr−1, equivalent to 20 ± 2% of marine N removal. We suggest that previous estimates of global shelf N loss might have been overestimated due to sampling bias toward areas with high N loads in the Northern Hemisphere.

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“…Within this cycle, denitrification is the biological process that reduces NO 3 − to molecular nitrogen (N 2 ) through the formation of nitrite (NO 2 − ), nitric oxide (NO), and nitrous oxide (N 2 O) under oxygen (O 2 )-limited conditions via the enzymes encoded by the napA/narG, nirK/nirS, norB, and nosZ genes, respectively [6][7][8]. Denitrification in sediments has been reported, with particular focus on N 2 O emissions [9][10][11][12], an anthropogenic greenhouse gas about 300 times as potent as carbon dioxide (CO 2 ) that accounts for about 12% of global greenhouse emissions [13,14].…”

Section: Introductionmentioning

confidence: 99%

Anthropogenic Nitrate Contamination Impacts Nitrous Oxide Emissions and Microbial Communities in the Marchica Lagoon (Morocco)

et al. 2023

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Lagoon systems are often confined, and their waters are poorly renewed, which makes them vulnerable to pollutants’ accumulation. Here, the impact of different sources of anthropogenic contamination (domestic, urban, industrial, and agricultural) on the nitrate (NO3−) content, emission of the greenhouse gas nitrous oxide (N2O), abundance of total bacterial archaeal, nitrifying, and denitrifying communities, and diversity and composition of bacterial communities in the sediments of the RAMSAR-protected Marchica lagoon (Nador, Morocco) was investigated. Six lake sites differing in NO3− concentration were selected. Wastewater coming from industrial activities results in the greatest concentration of NO3− in sediments and emissions of N2O. Increased carbon to nitrogen content in sites near domestic activities resulted in an increase in the abundance of total bacterial and archaeal communities, as well as nitrification and denitrification genes, but low N2O emissions due to a greater presence of microorganisms involved in N2O production over those able to reduce N2O. Significant differences in bacterial community composition between sites were observed, with the NO3− content being the main driver of these changes. Increased NO3− content in the sampling sites significantly reduced bacterial diversity. Bacterial genera involved in the degradation of organic and inorganic pollutants and nitrous oxide reduction, such as Robiginitalea, Symbiobacterium, Bacillus, Fusibacter, Neptunomonas, Colwellia, and Alteromonas, were the most abundant in the lagoon. The results suggest that the type of anthropogenic contamination directly impacts the nitrate content in the sediments of the Marchica lagoon, which determines variations in nitrous oxide emissions, nitrogen-cycling gene abundances, and bacterial diversity.

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Nitrogen removal processes coupled with nitrification in coastal sediments off the north East China Sea

Cited by 16 publications

References 58 publications

Nitrogen removal in freshwater sediments of riparian zone: N-loss pathways and environmental controls

Nitrogen removal in freshwater sediments of riparian zone: N-loss pathways and environmental controls

Denitrification, anammox, and DNRA in oligotrophic continental shelf sediments

Anthropogenic Nitrate Contamination Impacts Nitrous Oxide Emissions and Microbial Communities in the Marchica Lagoon (Morocco)

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