Dissimilatory nitrate reduction to ammonium conserves nitrogen in anthropogenically affected subtropical mangrove sediments in Southeast China

Cao, Wenzhi; Jing-xin, Yang; Li, Ying; Liu, Baoli; Wang, Feifei; Chang, Chang-Tang

doi:10.1016/j.marpolbul.2016.06.068

Cited by 62 publications

(21 citation statements)

References 43 publications

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“…The net increase in NH 4 –N by the end of incubation implied that mineralization prevails over nitrification processes over depths greater than 10 cm (Figure ). In addition, dissimilatory nitrate reduction to ammonium (DNRA) could also contribute to NH 4 –N accumulation (Cao et al, ; Fernandes et al, ). The importance of DNRA was not explicitly evaluated here but was expected to be minor since availability of nitrite and nitrate in pore water was relatively low.…”

Section: Discussionmentioning

confidence: 99%

Major Processes Shaping Mangroves as Inorganic Nitrogen Sources or Sinks: Insights From a Multidisciplinary Study

et al. 2019

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Mangrove wetlands support numerous ecosystem services including nutrient cycling and carbon sequestration and storage (blue carbon). Mangrove sediments may serve as a nitrogen source or sink to the hydrosphere and atmosphere at both regional and global scales. However, major mechanisms controlling the connection between the mangrove and the adjacent tidal creek (nitrogen cycling in sediments and outfluxing) remain unclear. A multidisciplinary study based on intensive investigation, incorporating detailed sediment profiling, multi‐isotopes analysis, sediment incubation, and microbiological identification was conducted in the Yunxiao mangrove reserve and Zhangjiang Estuary in southeast China. Here we show that mineralization and denitrification are major processes shaping mangroves as an ammonium source and nitrate sink. Enrichment of ammonium in pore water (10–40 cm in depth) likely resulted from strong ammonification with limited nitrification in the anaerobic sediments. Denitrification played a key role in nitrate removal from pore waters while producing N2O and N2. Decreasing δ15N‐N2O and associated δ15N:δ18O ratio suggested that most of the outgassing N2O was derived from incomplete denitrification in sediment pore water. Overall, there was a net export of dissolved inorganic nitrogen from mangroves toward the estuary in winter and spring but a net import to mangroves in summer and fall, mainly driven by tidal pumping with seasonal variation of bio‐uptake. These findings highlight the role of mangrove wetlands in regulating nutrient status and carbon budget in coastal areas.

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Section: Discussionmentioning

confidence: 99%

Major Processes Shaping Mangroves as Inorganic Nitrogen Sources or Sinks: Insights From a Multidisciplinary Study

et al. 2019

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“…In this study, the NH 4 + concentrations were larger than NO X − concentrations, which provided abundant substrate for Feammox (Table ). Our previous studies have shown that dissimilatory nitrate reduction to ammonium (DNRA) played an important role in converting nitrate to ammonium, resulting in the accumulation of NH 4 + (Cao et al ., ). Moreover, large rates of denitrification deplete the nitrate and nitrite pools (Alongi, ), and large rates of ammonification and N fixation also contribute to the production of ammonium (Alongi et al ., ).…”

Section: Discussionmentioning

confidence: 97%

“…Denitrifying bacteria are abundant in mangrove sediments (Alongi, ; Fernandes et al ., ), and rates of denitrification can be large, which makes ammonium the most common form of nitrogen observed in mangrove sediments. Dissimilatory nitrate reduction to ammonium (DNRA) also plays an important role in converting nitrate to ammonium, which results in its accumulation (Cao et al ., ). Moreover, iron content in mangrove sediments is appreciable (Chandan, ; Krishnan & Bharathi, ).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen loss through anaerobic ammonium oxidation coupled with iron reduction in a mangrove wetland

Guan

Cao

Wang

et al. 2018

European J Soil Science

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Summary Anaerobic ammonium oxidation coupled with iron(III) reduction (Feammox) with dinitrogen, nitrite or nitrate as end‐products is the most recently discovered nitrogen cycling process. This reaction has been observed in tropical forest soils, paddy soils and intertidal wetlands. However, Feammox has not been measured in mangrove wetlands. In this study, sediment slurry incubation experiments were combined with isotope tracing and acetylene inhibition techniques. Feammox was detected in mangrove sediments and ‘bare flats’ (mud flats without mangrove), with potential rates of 0.48 (±0.03 SE) mg N kg−1 day−1 (accounting for 6.4% of the total nitrogen loss through N2) and 0.38 (±0.02 SE) mg N kg−1 day−1 (accounting for 6.7% of the total nitrogen loss through N2), respectively. Microbially reducible iron(III) was added, which significantly (P < 0.01) increased the Feammox rate in contrast to no addition of iron(III). It was estimated that a loss of 12.33 t N year−1 was associated with Feammox in mangrove sediments of the Jiulong River Estuary, accounting for 0.04% of the total external inorganic nitrogen transported into the estuary. Overall, these findings demonstrate that Feammox can act as a nitrogen loss mechanism in mangroves. Highlights Feammox was investigated by ammonium 15N labelled isotopic tracing technique. Feammox rates in mangrove were larger than those in mud flats without mangrove. The nitrogen loss contribution of Feammox in mangrove was less than in other ecosystems. Tidal fluctuations and the large TOC would accelerate the Feammox process.

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“…In the DNRA process, NADH is biologically oxidized to produce NH 4 + using NO 3 − /NO 2 − as electron acceptors (Burgin and Hamilton, 2007). While denitri cation permanently removes nitrogen, DNRA effectively protects and recycles nitrogen and reduces nutrient loss during denitri cation (Cao et al, 2016;Zhao et al, 2020). Both the denitri cation and DNRA processes use nitrate as the reaction substrate, and there is a competitive relationship between the two reactions.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Dissimilatory Nitrate Reduction to Ammonium (DNRA) Microbial Communities in Sediments of Urban River Network Along the Huangpu River, china

Zhang

Zhuang

Ahmad

et al. 2021

Preprint

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Dissimilatory nitrate reduction to ammonium (DNRA) is an essential intermediate step in the nitrogen cycle, linking the oxidation and reduction processes of nitrogen compounds. But the detailed research on the environmental nitrogen cycling in urban river networks based on DNRA communities and the functional gene nrfA is lacking. In this study, the flow line of the Huangpu River in Shanghai was analyzed using isotope tracer, quantitative real-time PCR, and high-throughput sequencing techniques to evaluate the role of DNRA on the stability of the river network and marine. The significant positive correlation between the rate of DNRA and sediment organic carbon was identified. At the genus level, Anaeromyxobacter is the most dominant. Notably, both heterotrophic and autotrophic DNRA species were discovered. This study added diversity to the scope of urban freshwater river network ecosystem studies by investigating the distribution of DNRA bacteria along the Huangpu River.

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Dissimilatory nitrate reduction to ammonium conserves nitrogen in anthropogenically affected subtropical mangrove sediments in Southeast China

Cited by 62 publications

References 43 publications

Major Processes Shaping Mangroves as Inorganic Nitrogen Sources or Sinks: Insights From a Multidisciplinary Study

Major Processes Shaping Mangroves as Inorganic Nitrogen Sources or Sinks: Insights From a Multidisciplinary Study

Nitrogen loss through anaerobic ammonium oxidation coupled with iron reduction in a mangrove wetland

Investigation of Dissimilatory Nitrate Reduction to Ammonium (DNRA) Microbial Communities in Sediments of Urban River Network Along the Huangpu River, china

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