Nitrogen loss through denitrification, anammox and Feammox in a paddy soil

Ding, Bangjing; Zhang, Hui; Luo, Weiwei; Sun, Siyu; Cheng, Fan; Li, Zhengkui

doi:10.1016/j.scitotenv.2021.145601

Cited by 52 publications

(14 citation statements)

References 28 publications

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“…Although deep soils/sediments contain ~33% of total N [37] and 35-58% of total microbial biomass [38,39], measured rates in our study were generally highest in the top layer samples (0-5 cm) and declined significantly with depth (Figure 2). Hence, the results in this work assembled patterns reported in previous studies observed in various ecosystems, such as paddies [40], estuaries [41], coasts [42], coastal wetlands [43] and marines [44], with the decline mainly attributed to the vertical profiles of oxygen supply and available substrate concentrations. Compared with anammox, this non-linear pattern of decline with depth in denitrification and DNRA is more obvious in this study (Figure 2).…”

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

confidence: 84%

“…In addition, gene abundances decreased with sediment depth following the decrease in sediment organic matter in this study. Biomass and microbial abundance can directly affect the N-cycling activities in soils/sediments of various ecosystems [40,42,43]. Hence, the vertical spatial patterns of sediment NO x − reduction processes in this study were remarkably affected by the bioavailability of organic matter and microbial abundances.…”

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

confidence: 69%

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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: 84%

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

confidence: 69%

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

Lin

Huang

2022

JMSE

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“…Feammox process has also been reported in wetland soil, [51][52][53] riparian zones, 54 paddy soil, 55,56 agricultural drainage ditches, 57 and ocean sediments 58 by the application of 15 N-labelled NH 4 +based isotopic tracing techniques (Table 1). Apparently, the Feammox process is common in natural environments, especially in shallow soils or sediments.…”

Section: New Nh 4 + Oxidation Alternatives and Reaction Conditionsmentioning

confidence: 86%

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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“…Moreover, Fe(II) oxidation and Fe(III) reduction are coupled to N biogeochemical processes in flooded paddy soils [ 38 ]. Paddy soils are key habitats for microorganisms involved in Feammox, a major N loss pathway, with potential major bacterial drivers such as Geobacter, Pseudomonas, and Thiobacillus [ 39 , 40 , 41 ]. Reduced forms of Fe(II) would be oxidized by microaerophilic or nitrate-reducing Fe oxidizers that are ubiquitous in paddy soils, which accelerates the turnover of N [ 42 ].…”

Section: Introductionmentioning

confidence: 99%

Straw Incorporation with Nitrogen Amendment Shapes Bacterial Community Structure in an Iron-Rich Paddy Soil by Altering Nitrogen Reserves

Wang

Lin

et al. 2021

Microorganisms

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Incorporation of crop straw into the soil along with inorganic fertilization is a widespread agricultural practice and is essential in nutrient-scarce soils, such as iron-rich (ferruginous) paddy soils. The responses of soil bacterial communities to straw incorporation under different nitrogen inputs in iron-rich soils remain unclear. Therefore, 6000 kg ha−1 dry wheat (Triticum aestivum L. cv. Zhengmai 12) straw was applied to a rice paddy with and without nitrogen amendment (0, 80, 300, and 450 kg ha−1 N as urea), to investigate its effects on soil fertility and bacterial community structure. Organic matter, total nitrogen, and water contents tended to decrease in straw-incorporated soils with different nitrogen inputs. Proteobacteria was the dominant bacterial phylum across all treatments (26.3–32.5% of total sequences), followed by Chloroflexi, Acidobacteria, and Nitrospirae. Up to 18.0% of all the taxa in the bacterial communities were associated with iron cycling. Straw incorporation with nitrogen amendment increased the relative abundance of iron oxidizers, Gallionellaceae, while decreasing the relative abundance of iron reducers, Geobacteraceae. Bacterial community composition shifted in different treatments, with total nitrogen, water, and Fe(III) contents being the key drivers. Straw incorporation supplemented by 300 kg ha−1 N increased bacterial richness and enhanced all the predicted bacterial functions, so that it is recommended as the optimal nitrogen dosage in practice.

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Nitrogen loss through denitrification, anammox and Feammox in a paddy soil

Cited by 52 publications

References 28 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

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

Straw Incorporation with Nitrogen Amendment Shapes Bacterial Community Structure in an Iron-Rich Paddy Soil by Altering Nitrogen Reserves

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