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

Liu, Xueqin; Han, Jun; Ma, Zhiwen; Wang, Quan; Li, L.-H

doi:10.4067/s0718-95162016005000029

Cited by 8 publications

(6 citation statements)

References 38 publications

(50 reference statements)

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“…This is also congruent with a recent study on DNRA in coastal wetland sediments, where other organic C substrates (i.e. oxalate, citrate, glucose) showed a higher stimulating effect on DNRA with respect to acetate (Liu et al, 2016).…”

Section: No3and Acetate Consumptionsupporting

confidence: 92%

Reactive nitrogen losses via denitrification assessed in saturated agricultural soils

et al. 2019

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Section: No3and Acetate Consumptionsupporting

confidence: 92%

Reactive nitrogen losses via denitrification assessed in saturated agricultural soils

et al. 2019

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“…This could be explained by different soil property between two soil types. Some studies also claimed that DNRA are not necessarily enhanced by organic carbon addition due to the high native C content or unfavorable redox conditions for DNRA microbes (Rütting et al, 2011;Liu et al, 2016). Rahman and colleagues (2019) also reported a greater improvement of DNRA activity by addition of natural organic carbon (NOC) substrates rather than acetate amendment in urban wetlands, and attributed this to the stimulation of NOC on fermentative DNRA by nitrate ammonifying bacteria.…”

Section: Discussionmentioning

confidence: 99%

Greater promotion of DNRA rates and nrfA gene transcriptional activity by straw incorporation in alkaline than in acidic paddy soils

Bai

Fang

et al. 2020

Soil Ecol. Lett.

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Dissimilarity nitrate reduction to ammonium (DNRA) is of significance in agriculture ecosystems as the process is beneficial to N retention in soils. However, how fertilization regimes influence DNRA rates and functional microbes in agriculture was rarely estimated. In the present study, a 2-year pot experiment was conducted in two contrasting paddy soils to evaluate the effects of straw and nitrogen addition on DNRA process and the related functional microbes, using stable isotope tracer and molecular ecology techniques. The results showed that the abundance and transcription activity of nitrite reductase encoding gene (nrfA) involved in DNRA process and DNRA rates were significantly higher in alkaline soils than in acidic soils. Straw incorporation significantly enhanced nrfA gene abundance and transcription activity, with a greater effect in alkaline soil than in acidic soil. The rates of DNRA, abundance and transcription activity of nrfA gene positively correlated to soil C/N and C/NO 3 induced by straw application. Sequencing analysis based on nrfA gene transcript showed that Deltaproteobacteria was the most dominant group in both soil types (30.9%-67.4%), while Gammaproteobacteria, Chloroflexi, Actinobacteria were selectively enriched by straw incorporation. These results demonstrated that DNRA activity can be improved by straw return practice in paddy soils while the effect will vary among soil types due to differentiated functional microbial communities and edaphic properties.

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“…Fermentation is the main pathway of DNRA (Burgin & Hamilton, 2007; Rahman et al., 2019). The fast degradations of organic matter could rapidly provide energy for sediment DNRA (Liu et al., 2016). However, on the contrary, the study of Salk et al.…”

Section: Discussionmentioning

confidence: 99%

“…Fermentation is the main pathway of DNRA (Burgin & Hamilton, 2007;Rahman et al, 2019). The fast degradations of organic matter could rapidly provide energy for sediment DNRA (Liu et al, 2016). However, on the contrary, the study of Salk et al (2017) found that DNRA were stimulated by seagrass detritus but not by algal detritus in a subtropical estuarine system.…”

Section: Organic Matter Of High Quality Enhances Dnramentioning

confidence: 99%

The shift from macrophytic to algal particulate organic matter favours dissimilatory nitrate reduction to ammonium over denitrification in a eutrophic lake

Jiang

Gao

et al. 2021

Freshwater Biology

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1. In eutrophic lakes, the shift from a macrophyte-dominated state to an algaedominated state changes the particulate organic matter (POM) sources, which in turn alters organic matter quality that is released and that sinks to the benthos.However, the influences of this shift on denitrification and dissimilatory nitrate reduction to ammonium (DNRA) are unclear in eutrophic lakes.2. Here, we elucidated how various POM sources influenced these nitrate reduction pathways in a eutrophic lake. The lake sediments from August were incubated under algae, macrophyte, and soil treatments in aquarium tanks. Potential denitrification and DNRA rates and related functional gene abundances were measured periodically. Meanwhile, the n-alkanes composition of POM and fluorescence excitation-emission matrices of dissolved organic matter were measured before and during incubations, respectively, to aid in the analysis of the potential mechanisms by which organic matter quality affect nitrate reduction.3. The results indicated that algal detritus was more labile and decomposed faster than other POM, coupled with higher DNRA rates and nrfA gene abundances.Macrophyte treatments resulted in nitrate accumulation and the increase of gene abundances related to denitrification, but no increase in denitrification rates was observed. In soil treatments, nitrate reduction processes were not significantly influenced by the addition of POM. Overall, compared with other sources, algae-derived POM can produce high-quality organic carbon, low dissolved oxygen and nitrate concentrations, which is more conducive to DNRA than denitrification. 4. A loss of macrophytes and increase in algal biomass will induce changes in autochthonous POM quality and potentially drive nitrogen recycling in eutrophic lakes.

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

Cited by 8 publications

References 38 publications

Reactive nitrogen losses via denitrification assessed in saturated agricultural soils

Reactive nitrogen losses via denitrification assessed in saturated agricultural soils

Greater promotion of DNRA rates and nrfA gene transcriptional activity by straw incorporation in alkaline than in acidic paddy soils

The shift from macrophytic to algal particulate organic matter favours dissimilatory nitrate reduction to ammonium over denitrification in a eutrophic lake

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