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56 results for “Denitrification”
Soil properties shape the heterogeneity of denitrification and N2O emissions across large-scale flooded paddy soils
<p>The dataset's contents include the relative abundance of different denitrifier types at the genus level across eight different flooded paddy soils. This dataset categorizes denitrifier types in its first column labeled 'Type.' The second column, 'Genus,' associates each type with various species at the genus level. Subsequent columns present the relative abundance of these species in diverse sampling locations. Researchers can leverage this dataset to derive more patterns regarding the differences within specific dominant denitrifier species. No ethical considerations are pertinent to the utilization of this dataset.</p>
Variations and controlling factors of soil denitrification rate
<p>The denitrification process profoundly affects soil nitrogen (N) availability and generates its byproduct, nitrous oxide, as a potent greenhouse gas. There are large uncertainties in predicting global denitrification because its controlling factors remain elusive. In this study, we compiled 4301 observations of denitrification rates across a variety of terrestrial ecosystems from 214 papers published in the literature. The averaged denitrification rate was 3516.3 ± 91.1 µg N kg<sub>−1</sub> soil day<sub>−1</sub>. The highest denitrification rate was 4242.3 ± 152.3 µg N kg<sub>−1</sub> soil day<sub>−1</sub> under humid subtropical climates, and the lowest was 965.8 ± 150.4 µg N kg−1 under dry climates. The denitrification rate increased with temperature, precipitation, soil carbon and N contents, as well as microbial biomass carbon and N, but decreased with soil clay contents. The variables related to soil N contents (e.g., nitrate, ammonium, and total N) explained the variation of denitrification more than climatic and edaphic variables (e.g., mean annual temperature (MAT), soil moisture, soil pH, and clay content) according to structural equation models. Soil microbial biomass carbon, which was influenced by soil nitrate, ammonium, and total N, also strongly influenced denitrification at a global scale. Collectively, soil N contents, microbial biomass, pH, texture, moisture, and MAT accounted for 60% of the variation in global denitrification rates. The findings suggest that soil N contents and microbial biomass are strong predictors of denitrification at the global scale.</p>
Combined effects of stream hydrology and land use on basin-scale hyporheic zone denitrification in the Columbia River Basin
<p><strong>This data includes inputs and outputs of a coupled carbon-nitrogen river corridor model (RCM) for the Columbia River Basin and sensitivity results with varying substrate concentrations, and random forest model results with key model inputs/watershed/stream variables. The detailed descriptions of the individual files are included in the readme.txt file. </strong></p>
Unaccounted N2O source to the atmosphere from agriculture through groundwater denitrification and use for irrigation
<p>Nitrous oxide (N<sub>2</sub>O), a potent greenhouse gas, is produced in cultivated soils and this production is enhanced by the application of reactive nitrogen in the form of fertilizers. Part of fertilizers applied is not taken up by crops, leading to their accumulation in the groundwater where they can evolve into N<sub>2</sub>O through nitrification/denitrification. Based on chemical and isotopic measurements of nitrate (NO<sub>3</sub><sup>-</sup>) and N<sub>2</sub>O in Indian groundwater, we report for the first-time evidence for the widespread occurrence of denitrified NO<sub>3</sub><sup>-</sup> and of high concentrations of N<sub>2</sub>O (>2000% of saturation). The accumulation of N<sub>2</sub>O is high in regions where groundwater is intensely abstracted for irrigation, releasing this accumulated N<sub>2</sub>O into the atmosphere. Using annual mean groundwater abstraction for irrigation in India, which is the highest in the globe, we estimated that 0.06 to 20 GgN<sub>2</sub>O/y is effluxed to the atmosphere, which adds 0.1 to 20% of the N<sub>2</sub>O flux emitted by agricultural soils in India. This so far unidentified source around the globe may thus contribute significantly to the imbalance in the global N<sub>2</sub>O budget.</p>
Carcass decay inhibits denitrification indirectly by regulating the microbiota and physicochemical properties in a model water system
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Soil properties shape the heterogeneity of denitrification and N2O emissions across large-scale flooded paddy soils
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Variations and controlling factors of soil denitrification rate
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Denitrification rates in mountain lake sediments
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Relative importance between nitrification and denitrification to N2O from a global perspective
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Data from: Quantifying soil gaseous nitrogen losses from nitrification and denitrification based on nitrogen isotope model
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Global patterns and drivers of coupling between anammox and denitrification processes across inland aquatic ecosystems
<p>Here, we reported a dataset regarding global anammox and denitrification rates from inland aquatic ecosystems. </p>
Oxygen sensitivity of denitrification in the aquatic environments
<p>This dataset includes new measurements of denitrification (nitrate reduction to nitrite, nitrite reduction to N2O and N2) in response to manipulated oxygen concentration changes in Chesapeake Bay. Observations of oxygen sensitivity of denitrification in other aquatic environments (e.g., open ocean oxygen minimum zones) are compiled from previous studies for comparison. </p> <p>Please see the paper below for details:</p> <p>Tang, W., Fortin, S. G., Intrator, N., Lee, J. A., Kunes, M. A., Jayakumar, A., ... & Ward, B. B. (2025). Similar Oxygen Sensitivities of Different Steps of Denitrification in Estuarine Waters. <em>Environmental Science & Technology</em>. <span>59 (</span><span>14),</span><span> 7165–7175. </span><a title="DOI URL" href="https://doi.org/10.1021/acs.est.5c02248">https://doi.org/10.1021/acs.est.5c02248</a></p>
Disentangling the roles of plant functional diversity and plaint traits in regulating plant nitrogen accumulation and denitrification in freshwaters
<p>1. There is a growing recognition that functional measures of diversity, based on quantification of functionally important species traits, are useful for explaining variation in ecosystem processes. However, the mechanisms linking functional diversity to different processes remain poorly understood, hindering development of a predictive framework for ecosystem functioning based on species traits.</p> <p>2. The current understanding of how the functional traits of aquatic plants (macrophytes) affect nitrogen (N) cycling by regulating microbial communities and their activity in freshwater habitats is particularly limited. Denitrifying bacteria are typically associated with the roots of both aquatic and terrestrial plants and denitrification is the main cause of loss of N from ecosystems. Disentangling the interplay between plants and microbial denitrifiers is key to understanding variation in rates of denitrification from local to landscape scales.</p> <p>3. In a mesocosm experiment, we varied the species richness (monocultures or two- species mixtures) and composition of macrophytes. We quantified effects of both macrophyte functional diversity, quantified as functional trait dissimilarity, and functional trait composition, quantified as community weighted mean trait values, on N removal in wetlands. We used structural equation modelling to disentangle the direct and indirect influences of traits on N accumulation in plant biomass, denitrification activity and abundance of key bacterial denitrification genes (<i>nirS</i>and <i>nirK</i>).</p> <p>4. Both functional diversity and functional trait composition regulated N removal, explaining 70 – 94% variation in the underlying ecosystem processes. Increased macrophyte functional diversity increased plant N accumulation, and indirectly enhanced denitrification by increasing denitrification gene abundance. Among traits, greater plant relative growth rates, specific leaf area and aboveground biomass increased plant N accumulation. Denitrification activity increased with increasing belowground biomass but decreased with increasing root diameter.</p> <p><span><span><span><span><span><span><span><span><span><span><span>5. These findings improve our understanding of N removal in freshwater wetlands dominated by macrophytes, and have broad ecological implications for wetland management targeting enhanced ecosystem services. Our results highlight the potential for optimising denitrification and plant N accumulation in wetlands and thereby improving water purification by increasing macrophyte functional diversity and ensuring the presence of key traits in macrophyte assemblages.</span></span></span></span></span></span></span></span></span></span></span></p>
Data from: Influence of natural and novel organic carbon sources on denitrification in forest, degraded urban, and restored streams
Organic carbon is important in regulating ecosystem function, and its source and abundance may be altered by urbanization. We investigated shifts in organic carbon quantity and quality associated with urbanization and ecosystem restoration, and its potential effects on denitrification at the riparian–stream interface. Field measurements of streamwater chemistry, organic carbon characterization, and laboratory-based denitrification experiments were completed at two forested, two restored, and two unrestored urban streams at the Baltimore Long-Term Ecological Research site, Maryland, USA. Dissolved organic carbon (DOC) and nitrate loads increased with runoff according to a power-law function that varied across sites. Stable isotopes and molar C:N ratios suggested that stream particulate organic matter (POM) was a mixture of periphyton, leaves, and grass that varied across site types. Stable-isotope signatures and lipid biomarker analyses of sediments showed that terrestrial organic carbon sources in streams varied as a result of riparian vegetation. Laboratory experiments indicated that organic carbon amendments significantly increased rates of denitrification (35.1 ± 9.4 ng N·[g dry sediment]−1·h−1; mean ± SE) more than nitrate amendments (10.4 ± 4.0 ng N·[g dry sediment]−1·h−1) across streamflow conditions and sites. Denitrification experiments with naturally occurring carbon sources showed that denitrification was significantly higher with grass clippings from home lawns (1244 ± 331 ng N·g dry sediment−1·h−1), and overall unrestored urban sites showed significantly higher denitrification rates than restored and forest sites. We found that urbanization influences organic carbon sources and quality in streams, which can have substantial downstream impacts on ecosystem services such as denitrification.
Nitrification, denitrification, and related functional genes under elevated CO2: a meta-analysis in terrestrial ecosystems
<p>This file encompasses the data that support the findings of the study entitled "Nitrification, denitrification, and related functional genes under elevated CO<sub>2</sub>: a meta-analysis in terrestrial ecosystems" by Robin Gineyts and Audrey Niboyet in Global Change Biology.</p>
Data from: Effect of organic matters on anammox coupled denitrification system: when nitrite nitrogen was sufficient
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Data from: Influence of natural and novel organic carbon sources on denitrification in forest, degraded urban, and restored streams
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Effects of salinity on the simultaneous anammox and denitrification process: performance, sludge morphology, and shifts in microbial communities
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Disentangling the roles of plant functional diversity and plaint traits in regulating plant nitrogen accumulation and denitrification in freshwaters
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Data from: Optimization of nitrogen and carbon removal with simultaneous partial nitrification, anammox, and denitrification (SNAD) in membrane bioreactor (MBR)
<p>In this study, a membrane bioreactor (MBR) was used to achieve both nitrogen and carbon removal by a simultaneous partial nitrification, anammox, and denitrification (SNAD) process. During the entire experiment, the optimal operating parameters as determined by response surface methodology (RSM) were a C/N value of 1.16, a DO value of 0.84 mg·L<sup><span>-1</span></sup>, and an aerobic time (<i><span>T</span></i><i><sub><span><span>ae</span></span></sub></i>) of 15.75 min. Under these conditions, the SNAD process achieved efficient and stable nitrogen and carbon removal; the total inorganic nitrogen (TIN) removal efficiency and chemical oxygen demand (COD) removal efficiency were 92.31% and 95.67%, respectively. With the formation of granular sludge, the membrane fouling rate (MFR) decreased significantly from 35.0 Pa·h<sup><span>-1</span></sup> at SNAD start-up to 19.9 Pa·h<sup><span>-1</span></sup> during stable operation. Fluorescence in situ hybrid (FISH) analyse confirmed the structural characteristics and the relative ratio of AerAOB, AnAOB, and DNB in the SNAD system.</p>
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