Nitrate ammonification and its relationship to the accumulation of ammonium in a Vertisol subsoil

Page, K. L.; Dalal, Ram C.; Menzies, Neal W.

doi:10.1071/sr02100

Cited by 16 publications

(7 citation statements)

References 23 publications

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“…The significant correlations between NO 3 − reduction and NH 4 + recovery are in agreement with findings by Page et al . (2003) and Tusneem (1970), that reported that NO 3 − is reduced to NH 4 + under O 2 -limited conditions, similarly to the current experiment. This process requires an electron source generally in the form of C; hence there are significant differences in NH 4 + appearance and NO 3 − reduction as influenced by different C sources (Mohan and Cole, 2007; Soussana and Lemaire, 2014).…”

Section: Discussionsupporting

confidence: 88%

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Evaluating the potential of different carbon sources to promote denitrification

et al. 2020

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Abstract Organic carbon (C) plays an essential role in the denitrification process as it supplies energy for N2O, N2 and CO2 producing reactions. The objectives of this study were to: (i) rank the reactivity of different C compounds found in manures based on their availability for denitrification and (ii) explore C-quality in different C sources based on their capacity to promote denitrification. Evaluation of different C-sources in promoting denitrification was conducted based on the molar ratio of CO2 production to NO3− reduction after incubation. Results of the first experiment (a 12-day investigation) showed that glucose and glucosamine were highly reactive C compounds with all applied NO3− being exhausted by day 3, and glucosamine had significantly high amount of NH4+-N present at end of the experiment. The glucose and glucosamine treatments resulted in significantly greater cumulative CO2 production, compared to the other treatments. In the second experiment (a 9-day investigation), all NO3− had been depleted by day 6 and 9 from acetic acid and glucose, respectively, and the greatest cumulative CO2 production was from acetic acid. The CO2 appearance to NO3− molar ratios revealed that glucose and glucosamine were compounds with highly available C in the first experiment. In the second experiment, the pig slurry and acetic acid were found to be C-sources that promoted potential denitrification. The application of slurry to soil results in the promotion of denitrification and this depends on the availability of the C compounds it contains. Understanding the relationship between C availability and denitrification potential is useful for developing denitrification mitigation strategies for organic soil amendments.

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Section: Discussionsupporting

confidence: 88%

“…This process occurs in anaerobic conditions; however, its importance in soils remains uncertain (Yonebayashi and Hattori, 1980). The significant correlations between NO 3 − reduction and NH 4 + recovery are in agreement with findings by Page et al (2003) and Tusneem (1970), that reported that NO 3…”

Section: Ranking the Reactivity Of Carbon Compoundssupporting

confidence: 88%

Evaluating the potential of different carbon sources to promote denitrification

et al. 2020

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“…The soil oxidation state is a principal factor that influences the importance of DNRA compared to denitrification (Matheson et al, 2002;Brunel et al, 1992) with DNRA by bacteria and fungi occurring under more reducing (anoxic) conditions (Takaya, 2002;Yin et al, 2002;Page et al, 2003). On the other hand, other studies showed that DNRA is less sensitive to variable redox conditions (Pett-Ridge et al, 2006) and less sensitive to O 2 than denitrification (Fazzolari et al, 1998).…”

Section: Environmental Conditions For Dnramentioning

confidence: 99%

“…The studies by Ambus et al (1992) and Dhondt et al (2003) both point to the occurrence of DNRA under more reduced conditions compared to denitrification. However, some studies indicated that DNRA and denitrification can occur simultaneously in soil (Paul and Beauchamp, 1989;Morley and Baggs, 2010), possibly in different micro-sites that differ in redox state. Furthermore, in contrast to Ambus et al (1992), slurry incubations with soil from a riparian zone by Davis et al (2008) resulted in higher DNRA rates in the surface soil (0-15 cm) compared to sub-soil (130-155 cm).…”

Section: N Labelling To Confirm Dnra Occurrencementioning

confidence: 99%

Assessment of the importance of dissimilatory nitrate reduction to ammonium for the terrestrial nitrogen cycle

Rütting¹,

Boeckx²,

Müller³

et al. 2011

Preprint

138

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The nitrogen (N) cycle contains two different processes of dissimilatory nitrate (NO3−) reduction, denitrification and dissimilatory NO3− reduction to ammonium (DNRA). While there is general agreement that the denitrification process takes place in many soils, the occurrence and importance of DNRA is generally not considered. Two approaches have been used to investigate DNRA in soil, (1) microbiological techniques to identify soil microorganisms capable of DNRA and (2) 15N tracing to elucidate the occurrence of DNRA and to quantify gross DNRA rates. There is evidence that many soil bacteria and fungi have the ability to perform DNRA. Redox status and C/NO3− ratio have been identified as the most important factors regulating DNRA in soil. 15N tracing studies have shown that gross DNRA rates can be a significant or even a dominant NO3− consumption process in some ecosystems. Moreover, a link between heterotrophic nitrification and DNRA provides an alternative pathway of ammonium (NH4+) production to mineralisation. Numerical 15N tracing models can be particularly useful when investigating DNRA in the context of other N cycling processes. With this review we summarise the importance and current knowledge of this often overlooked NO3− consumption process within the terrestrial N cycle. We strongly encourage considering DNRA as a relevant soil N process in future N cycling investigations

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“…This was supported by the significantly higher pheophytin-a concentrations found in surface sediments at this site in summer 2003 (11.4±3.6 mg m −2 ) compared with those in summer 2002 (3.7±0.4 mg m −2 ). In addition, Page et al (2003) state that the anoxic conditions of sediments may enhance the sediment nitrate reduction (i.e., denitrification and dissimilatory nitrate to ammonia, DRNA) and DRNA may be favored when conditions are sufficiently reduced and electron acceptors are in sufficiently short supply, so the reduction of nitrate to ammonium becomes necessary. Such highly reduced conditions may have developed at this site during summer 2003 to allow a rapid DRNA rate to occur, leading to a high ammonium NH þ 4 release from sediments and low NO À 3 + NO À 2 uptake rate.…”

Section: Temporal (Diel and Seasonal) Variations Of Din Fluxes Acrossmentioning

confidence: 98%

Spatial and Temporal Variability in Dissolved Inorganic Nitrogen Fluxes at the Sediment–Water Interface in Lake Illawarra, Australia

Morrison

West

et al. 2007

Water Air Soil Pollut

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In this study, benthic flux measurements of inorganic nitrogen (i.e., NH þ 4 , NO À 2 + NO À 3 ) were made using a batch incubation system at different stations (i.e., shallow sandy macrophyte and unvegetated beds, and deep central mud) over four seasons in Lake Illawarra, NSW, Australia, to study the influence of different primary producers (i.e., seagrasses, microphytobenthos (MPB) and macroalgae) and/or different sediment types (i.e., sand or mud) on the benthic fluxes. In general, nutrient fluxes displayed typical diel variations, with lower flux out of sediments (release) or enhanced uptake by the sediment in the light, due to the photosynthetic activities of the plant-MPB-sediment community in Lake Illawarra during photosynthetic periods. A distinct seasonal pattern of inorganic-N fluxes was also observed (e.g., the marked difference between summers 2002 and 2003). This may be explained by the seasonal variations in the biomass and activity (growing or decay phases) of MPB, seagrass and macroalgae, which may influence their nutrient assimilation and alter the chemical conditions of surface sediments that influence the benthic geochemical processes and thus benthic nutrient fluxes. On an annual basis, unvegetated sediments displayed net DIN effluxes, while seagrass beds showed a net DIN uptake, and the highest DIN uptakes coincided with the largest standing crop of seagrass and/or macroalgae and the highest levels of benthic community production. This may be due to the enhanced denitrification and/or assimilation activity by rooted plants and macroalgae, and the effect is most efficient during periods of net growth (e.g., in Spring 2002).

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Nitrate ammonification and its relationship to the accumulation of ammonium in a Vertisol subsoil

Cited by 16 publications

References 23 publications

Evaluating the potential of different carbon sources to promote denitrification

Evaluating the potential of different carbon sources to promote denitrification

Assessment of the importance of dissimilatory nitrate reduction to ammonium for the terrestrial nitrogen cycle

Spatial and Temporal Variability in Dissolved Inorganic Nitrogen Fluxes at the Sediment–Water Interface in Lake Illawarra, Australia

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