Nitrogen cycling processes in sediments of the Pearl River Estuary: Spatial variations, controlling factors, and environmental implications

Huang, Fangjuan; Lin, Xianbiao; Hu, Weifang; Zeng, Fang; He, Lei; Yin, Kedong

doi:10.1016/j.catena.2021.105545

Cited by 74 publications

(48 citation statements)

References 84 publications

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“…This is consistent with several previous incubation experiments, which found that Fe 2+ addition has been shown to stimulate DNRA but not denitrification in some previous incubation experiments [47,48]. Additionally, we found our measure denitrification rates were negatively correlated with Fe 2+ , and there was no significant correlation between anammox rates and Fe 2+ (Figure 3), which is inconsistent with previous studies [12,49]. Most previous studies generally demonstrated that Fe 2+ can serve as an electron donor for NO x − reduction in the denitrification and anammox processes (Equations ( 1) and ( 2)).…”

Section: Effects Of Environmental Variables On No X − Reduction Proce...supporting

confidence: 74%

“…Previous studies have shown that N loss in pond surface sediments was higher than in other natural habitats (including tidal rivers, marines, and reservoirs) due to human nutrients and organic matter inputs [51]. The nirS (3.80 ± 0.47 × 10 8 copies g −1 and 8.01 ± 2.27 × 10 8 copies g −1 in mangrove and aquaculture, respectively) and nrfA (4.58 ± 0.19 × 10 8 copies g −1 and 3.11 ± 0.43 × 10 8 copies g −1 in mangrove and aquaculture, respectively) genes were detected with high copy numbers in aquaculture and mangrove surface sediments, being higher than those reported for marine, estuarine, and coastal sediments [4,9,12,13,52]. The ANAMMOX 16S gene abundances (2.57 ± 0.32 × 10 6 copies g −1 and 10.3 ± 0.48 × 10 6 copies g −1 in mangrove and aquaculture, respectively) in this study are of considerable value when compared with other aquaculture [51,53] and mangrove ecosystems [27].…”

Section: Effects Of Environmental Variables On No X − Reduction Proce...mentioning

confidence: 68%

“…The membrane inlet mass spectrometry (MIMS, Hiden Analytical Ltd., Warrington, UK) was used to analyze the concentrations of generated 29 N 2 and 30 N 2 . Calculation of denitrification and anammox rates were conducted according to previous literature [9,12].…”

Section: Sediment Incubation Experimentsmentioning

confidence: 99%

“…The coastal wetland is a critical link between the land and the sea, which plays an important role in the removal of nutrients [10]. In general, the excess reactive N in estuarine and coastal ecosystems mostly comes in the form of NO 3 − and NH 4 + [11][12][13][14]. Thus, our research mainly focuses on sediment NO x − reduction processes, which play a dominant role in estuarine and coastal ecosystems.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Aquaculture Reclamation on Sediment Nitrates Reduction Processes in Mangrove Wetland

Lin

Huang

2022

JMSE

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Sediment denitrification, anaerobic ammonium oxidation (anammox), and nitrate dissimilation to ammonium (DNRA) play an important role in controlling the dynamics of nitrates (NOx−) and their fate in estuarine and coastal ecosystems. However, the effects of land-use change on NOx− reduction processes in mangrove sediments are still unclear. Here, we used a mud experiment method combined with a 15N stable isotope tracer method to study the mechanism and ecological environment of the change of land use pattern on the sediment NOx− reduction processes in mangrove wetlands. Our study showed that most physicochemical parameters, NOx− reduction rates, and their gene abundances varied considerably. The denitrification, anammox, and DNRA rates in mangrove sediment cores were in a range of 1.04–4.24 nmol g−1 h−1, 0.14–0.36 nmol g−1 h−1, and 0–2.72 nmol g−1 h−1, respectively. The denitrification, anammox, and DNRA rates in aquaculture sediment cores were in a range of 1.06–10.96 nmol g−1 h−1, 0.13–0.37 nmol g−1 h−1, and 0–1.96 nmol g−1 h−1, respectively. The highest values of denitrification, anammox, DNRA, the contribution of denitrification and DNRA to total NOx− reduction (DEN% and DNRA%), gene abundances (nirS, Amx 16S rRNA, and nrfA), total organic carbon (TOC), total nitrogen (TN), and TOC/TN in sediments were generally found in the top layer (0–5 cm) and then decreased with depth, while the contribution of anammox to total NOx− reduction (ANA%), Fe2+, and Fe2+/Fe3+ were generally increased with sediment depth in both mangrove and aquaculture ecosystems. When mangrove wetlands are transformed into pools, some properties (including TOC, TN, and Fe3+), DNRA rates, DRNA%, and nrfA gene abundances were decreased, while some properties (including NH4+, TOC/TN, Fe2+, and Fe2+/Fe3+), denitrification rates, DEN%, nirS, and ANAMMOX 16S gene abundances were increased. Sediment organic matter (TOC and TN) content and Fe2+ both affected NO3− reduction rates, with organic matter the most prominent factor. Thus, aquaculture reclamation enhances N loss while reducing N retention in sediments of mangrove wetlands, which plays an important role in regulating the source and fate of reactive N in mangrove ecosystems.

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Section: Effects Of Environmental Variables On No X − Reduction Proce...supporting

confidence: 74%

Section: Effects Of Environmental Variables On No X − Reduction Proce...mentioning

confidence: 68%

Section: Sediment Incubation Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Aquaculture Reclamation on Sediment Nitrates Reduction Processes in Mangrove Wetland

Lin

Huang

2022

JMSE

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“…N is a key nutrient that may biologically limit production in aquaculture ecosystems, and microbes play a pivotal role in N cycling [13]. Six key processes are important in microbial-mediated N cycling including N fixation, assimilatory nitrate reduction, nitrification, denitrification, anaerobic ammonium oxidation (ANAMMOX), and dissimilatory nitrate reduction to ammonium (DNRA) [14,15]. Notably, denitrification, ANAMMOX, and DNRA have been viewed as important mechanisms of dissimilatory nitrate reduction in environments, and the level of sulfide (S) greatly influences the predominance of these processes [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Metagenomic Insights into the Structure of Microbial Communities Involved in Nitrogen Cycling in Two Integrated Multitrophic Aquaculture (IMTA) Ponds

Liu

Shan

et al. 2022

JMSE

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The microbial structure and metabolic potential, particularly with regard to nitrogen (N) cycling, in integrated multitrophic aquaculture (IMTA) ponds with shrimp remain unclear. In this study, an analysis of microbial community taxonomic diversity and a metagenomic analysis of N-related genes were performed in a shrimp-crab pond (Penaeus japonicus-Portunus trituberculatus, SC) and a shrimp-crab-clam pond (P. japonicus-P. trituberculatus-Sinonovacula constricta, SCC) to evaluate microbial structure and N transformation capacities in these two shrimp IMTA ponds. The composition of the microbial communities was similar between SC and SCC, but the water and sediments shared few common members in either pond. The relative abundances of N cycling genes were significantly higher in sediment than in water in both SC and SCC, except for assimilatory nitrate reduction genes. The main drivers of the differences in the relative abundances of N cycling genes in SC and SCC were salinity and pH in water and the NO2- and NH4+ contents of pore water in sediment. These results indicate that the coculture of S. constricta in a shrimp-crab pond may result in decreased N cycling in sediment. The reduced N flux in the shrimp IMTA ponds primarily originates within the sediment, except for assimilatory nitrate reduction.

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A review on new ammonium oxidation alternatives for effective nitrogen removal from wastewater

Zhao

Feng

et al. 2022

J of Chemical Tech & Biotech

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As a highly oxidizing ion, ammonium (NH4+) is easily reduced by other reducing substances. Recently, NH4+ oxidation coupled with Fe3+, SO42−, and Mn4+ reduction (i.e., Feammox, Sulfammox, and Mnammox) has been confirmed and their collaborative roles in removing NH4+ have been revealed in several studies. However, only limited knowledge could be obtained on observed interactions with several variable parameters due to the exiguous research in this field, which makes it challenging to draw basic and mechanistic conclusions. This review focuses on these new NH4+ oxidation alternatives and provides a systematic and comprehensive overview of recent advances in these processes. Specifically, based on the summaries of their reaction conditions, nine influencing factors (including microorganisms, concentrations of reactants, pH, redox potential, temperature, organic carbon, oxygen concentration, salinity, and inhibitory substances) are discussed in detail. Then, the drawbacks of the three processes are pointed out. The results show that, at present, the practical engineering applications for NH4+ removal are not suitable due to their harsh reaction conditions and low removal efficiency. Finally, suggestions for further research on these processes are presented to inspire more interest from researchers in related fields and to promote and realize their large‐scale engineering application in the near future. © 2022 Society of Chemical Industry (SCI).

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Nitrogen cycling processes in sediments of the Pearl River Estuary: Spatial variations, controlling factors, and environmental implications

Cited by 74 publications

References 84 publications

Effect of Aquaculture Reclamation on Sediment Nitrates Reduction Processes in Mangrove Wetland

Effect of Aquaculture Reclamation on Sediment Nitrates Reduction Processes in Mangrove Wetland

Metagenomic Insights into the Structure of Microbial Communities Involved in Nitrogen Cycling in Two Integrated Multitrophic Aquaculture (IMTA) Ponds

A review on new ammonium oxidation alternatives for effective nitrogen removal from wastewater

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