Dissimilatory nitrate reduction to ammonium and responsible microorganisms in two Chinese and Australian paddy soils

Yin, Shixue; Chen, D; Chen, L.M; Edis, Robert

doi:10.1016/s0038-0717(02)00049-4

Cited by 151 publications

(71 citation statements)

References 20 publications

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“…For instance, Tobias et al, (2001) and Yin et al, (2002) claimed that NH 4 + -N generated from DNRA was mainly immobilized in the soil ON pool, while Scott The characteristics of soil N concentrations along time were in line with some previous investigations (Yin et al, 2002;Scott et al, 2008;Lu et al, 2015).…”

Section: Relative Potential Of Soil Dnrasupporting

confidence: 85%

“…As soon as the pre-incubation After all amendments were added, the flasks were immediately incubated in the dark at 25 o C. It is generally believed that DNRA is a fast process (Yin et al, 2002;Lu et al, 2013). In order to make our investigation comparable to previous ones, 12 h and 24 h were …”

Section: Experimental Set-upmentioning

confidence: 99%

“…Relative potential of DNRA, which also refers to the contribution of DNRA to total dissimilatory one of which is NH 4 + -N immobilization (Tobias et al, 2001;Yin et al, 2002;Zhang et al, 2014). For instance, Tobias et al, (2001) and Yin et al, (2002) claimed that NH 4 + -N generated from DNRA was mainly immobilized in the soil ON pool, while Scott The characteristics of soil N concentrations along time were in line with some previous investigations (Yin et al, 2002;Scott et al, 2008;Lu et al, 2015).…”

Section: Relative Potential Of Soil Dnramentioning

confidence: 99%

“…Because of the different productions, DNF has been not only considered as a major pathway of N loss in soil-plant systems (Gong et al, 2013), but also the major biological process responsible for global increases in atmospheric N 2 O (Baggs, 2008;Morley et al, 2014). In contrast, DNRA conserves N in soils as NH 4 + , thus retaining N levels of soils (Yin et al, 2002;Koop-Jakobsen and Giblin, 2010). For a long time, DNF is considered as the predominant pathway to remove NO 3 - (Burgin and Hamilton, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Carbon source on dissimilatory nitrate reduction to ammonium in Costal Wetland sediments

Liu

Han

et al. 2016

J. Soil Sci. Plant Nutr.

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15 N atom% of NO 3 --N is 20%). The results showed that soil DNRA rates varied from 0.018-0.497 mg N kg -1 dry soil d -1 during the whole incubation, and the rates differed significantly among treatments following the order: oxalate> citrate> glucose> acetate> malate>no exogenous C addition over the first 12-h incubation. This was possibly caused by the different decomposition rates of various OC sources, which further influenced the available energy provided for DNRA microorganisms. Soils with no addition of exogenous C showed low soil DNRA rates, presumably because of the low C/NO 3 -ratio as well as energy availability. The relative lower soil DNRA rates over the 24-h incubation indicated that DNRA is a fast process. Our results suggest that DNRA could be controlled by OC sources, especially organic acids, demonstrating that the widespread use of glucose in soil laboratory studies might limit our understanding on the effects of OC on soil DNRA process.

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Section: Relative Potential Of Soil Dnrasupporting

confidence: 85%

Section: Experimental Set-upmentioning

confidence: 99%

Section: Relative Potential Of Soil Dnramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Carbon source on dissimilatory nitrate reduction to ammonium in Costal Wetland sediments

Liu

Han

et al. 2016

J. Soil Sci. Plant Nutr.

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“…The ratio of the moles of N 2 produced to the moles of NO 3 Ϫ removed decreased down the estuary, while the ratio of the moles of NH 4 ϩ produced to the moles of NO 3 Ϫ removed increased (Table 1), indicating a decrease in the potential for DN and an increase in the potential for DNRA down the estuary. This change in the relative significance of DN and DNRA has been attributed previously (4,12,16,48) to increases in the ratio of electron donors to electron acceptors in soils or sediments, which stimulate DNRA relative to DN, and in the present case is due probably to the decrease in nitrate concentrations in the water column toward the mouth of the estuary. There is currently no way of directly measuring available organic matter within sediments.…”

Section: Discussionsupporting

confidence: 75%

Changes in Benthic Denitrification, Nitrate Ammonification, and Anammox Process Rates and Nitrate and Nitrite Reductase Gene Abundances along an Estuarine Nutrient Gradient (the Colne Estuary, United Kingdom)

Dong

Smith

Papaspyrou

et al. 2009

Appl Environ Microbiol

201

138

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Estuarine sediments are the location for significant bacterial removal of anthropogenically derived inorganic nitrogen, in particular nitrate, from the aquatic environment. In this study, rates of benthic denitrification (DN), dissimilatory nitrate reduction to ammonium (DNRA), and anammox (AN) at three sites along a nitrate concentration gradient in the Colne estuary, United Kingdom, were determined, and the numbers of functional genes (narG, napA, nirS, and nrfA) and corresponding transcripts encoding enzymes mediating nitrate reduction were determined by reverse transcription-quantitative PCR. In situ rates of DN and DNRA decreased toward the estuary mouth, with the findings from slurry experiments suggesting that the potential for DNRA increased while the DN potential decreased as nitrate concentrations declined. AN was detected only at the estuary head, accounting for ϳ30% of N 2 formation, with 16S rRNA genes from anammox-related bacteria also detected only at this site. Numbers of narG genes declined along the estuary, while napA gene numbers were stable, suggesting that NAP-mediated nitrate reduction remained important at low nitrate concentrations. nirS gene numbers (as indicators of DN) also decreased along the estuary, whereas nrfA (an indicator for DNRA) was detected only at the two uppermost sites. Similarly, nitrate and nitrite reductase gene transcripts were detected only at the top two sites. A regression analysis of log(n ؉ 1) process rate data and log(n ؉ 1) mean gene abundances showed significant relationships between DN and nirS and between DNRA and nrfA. Although these log-log relationships indicate an underlying relationship between the genetic potential for nitrate reduction and the corresponding process activity, fine-scale environmentally induced changes in rates of nitrate reduction are likely to be controlled at cellular and protein levels.Estuaries are major conduits for the transport of anthropogenically derived nitrogen (e.g., from fertilizer runoff and from wastewater treatment plants) from land to sea (18,20). Estuarine sediments are now recognized as being an important location for the removal of inorganic nitrogen from this environment via benthic nitrate reduction to nitrogenous gases (21). Previously, we have utilized the isotope-pairing technique (22) to investigate rates of denitrification (DN) of nitrate to N 2 O and N 2 along the nitrate and salinity gradients in the hypernutrified Colne estuary, United Kingdom, and demonstrated that DN rates are highest at the estuary head, where nitrate levels are also at their highest (7, 9). However, DN represents only one of three key pathways relevant to nitrate reduction, with a recent review suggesting that the importance of DN in aquatic systems may be overstated (3). A substantial proportion of nitrate may alternatively be converted to ammonium (1, 16, 17) via dissimilatory nitrate reduction to ammonium (DNRA), in which case inorganic nitrogen is retained within the aquatic environment. Nitrite, usually derived from nitrate reduc...

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Dissimilatory nitrate reduction processes and associated contribution to nitrogen removal in sediments of the Yangtze Estuary

et al. 2015

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Dissimilatory nitrate reduction processes, including denitrification, anaerobic ammonium oxidation (ANAMMOX), and dissimilatory nitrate reduction to ammonium (DNRA), play an important role in controlling the nitrate dynamics and fate in estuarine and coastal environments. We investigated potential rates of denitrification, ANAMMOX, and DNRA in the sediments of the Yangtze Estuary via slurry incubation experiments combined with isotope-tracing techniques to reveal their respective contributions to total nitrate reduction in this hypereutrophic estuarine ecosystem. Measured rates of denitrification, ANAMMOX, and DNRA ranged from 0.06 to 4.51 μmol N kg À1 h À1, 0.01 to 0.52 μmol N kg À1 h À1, and 0.03 to 0.89 μmol N kg À1 h À1, respectively. These potential dissimilatory nitrate reduction process rates correlated significantly with salinity, sulfide, organic carbon, and nitrogen. Denitrification contributed 38-96% total nitrate reduction in the Yangtze Estuary, as compared to 3-45% for DNRA and 1-36% for ANAMMOX. In total, the denitrification and ANAMMOX processes removed approximately 25% of the external inorganic nitrogen transported annually into the estuary. In contrast, most external inorganic nitrogen was retained in the estuary and contributes substantially to the severe eutrophication of the Yangtze Estuary.

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Dissimilatory nitrate reduction to ammonium and responsible microorganisms in two Chinese and Australian paddy soils

Cited by 151 publications

References 20 publications

Effect of Carbon source on dissimilatory nitrate reduction to ammonium in Costal Wetland sediments

Effect of Carbon source on dissimilatory nitrate reduction to ammonium in Costal Wetland sediments

Changes in Benthic Denitrification, Nitrate Ammonification, and Anammox Process Rates and Nitrate and Nitrite Reductase Gene Abundances along an Estuarine Nutrient Gradient (the Colne Estuary, United Kingdom)

Dissimilatory nitrate reduction processes and associated contribution to nitrogen removal in sediments of the Yangtze Estuary

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