The fate of N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O consumed in soils

Vieten, B.; Conen, Franz; Seth, Barbara; Alewell, Christine

doi:10.5194/bgd-4-3331-2007

Cited by 11 publications

(8 citation statements)

References 18 publications

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“…Sanford et al (2012) suggested that nondenitrifying populations with a broad range of metabolisms and habitats are potentially significant contributors to N 2 O consumption, therefore controlling N 2 O emissions. However, the mechanisms and controls of N 2 O consumption in soil are not clear, and various biochemical routes have been identified in addition to the classical reduction of N 2 O during denitrification (van Groenigen et al 2015); these routes include dissimilative reduction, a direct assimilatory N 2 O fixation via nitrogenase (Vieten et al 2008;Farías et al 2013). Recently, Wu et al (2013) reported a significant N 2 O consumption occurring under aerobic conditions, with a rising N 2 O consumption with increased soil moisture content, and the complete blockage of N 2 O consumption with the sterilization of oxic soil.…”

Section: Discussion Environmental Conditions In the Reloncaví Estuarymentioning

confidence: 99%

Spatial Distribution of Nitrous Oxide (N2O) in the Reloncaví Estuary–Sound and Adjacent Sea (41°–43° S), Chilean Patagonia

Yevenes

Bello

Sanhueza-Guevara

2016

Estuaries and Coasts

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Fjords and estuaries exchange large amounts of solutes, gases, and particulates between fluvial and marine systems. These exchanges and their relative distributions of compounds/particles are partially controlled by stratification and water circulation. The spatial and vertical distributions of N 2 O, an important greenhouse gas, along with other oceanographic variables, are analyzed from the Reloncaví estuary (RE) (~41°30′ S) to the gulf of Corcovado in the interior sea of Chiloé (43°45′ S) during the austral winter. Freshwater runoff into the estuary regulated salinity and stratification of the water column, clearly demarking the surface (<5 m depth) and subsurface layer (>5 m depth) and also separating estuarine and marine influenced areas. N 2 O levels varied between 8.3 and 21 nM (corresponding to 80 and 170 % saturation, respectively), being significantly lower (11.8 ± 1.70) at the surface than in subsurface waters in the Reloncaví estuary (14.5 ± 1.73). Low salinity and NO 3 − , NO 2 − , and PO 4 3− levels, as well as high Si(OH) 4 values were associated with low surface N 2 O levels. Remarkably, an accumulation of N 2 O was observed in the subsurface waters of the Reloncaví sound, associated with a relatively high consumption of O 2 . The sound is exposed to increasing anthropogenic impacts from aquaculture and urban discharge, occurring simultaneously with an internal recirculation, which leads to potential signals of early eutrophication. In contrast, within the interior sea of Chiloé (ISC), most of water column was quasi homohaline and occupied by modified subantarctic water (MSAAW), which was relatively rich in N 2 O (12.6 ± 2.36 nM) and NO 3 − (18.3 ± 1.63 μM). The relationship between salinity, nutrients, and N 2 O revealed that water from the open ocean, entering into ISC (the Gulf of Corcovado) through the Guafo mouth, was the main source of N 2 O (up to 21 nM), as it gradually mixed with estuarine water. In addition, significant relationships between N 2 O excess vs. AOU and N 2 O excess vs. NO 3 − suggest that part of N 2 O is also produced by nitrification. Our results show that the estuarine and marine waters can act as light source or sink of N 2 O to the atmosphere (air-sea N 2 O fluxes ranged from −1.57 to 5.75 μmol m −2 day −1 ), respectively; influxes seem to be associated to brackish water depleted in N 2 O that also caused a strong stratification, creating a barrier to gas exchange.

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Section: Discussion Environmental Conditions In the Reloncaví Estuarymentioning

confidence: 99%

Spatial Distribution of Nitrous Oxide (N2O) in the Reloncaví Estuary–Sound and Adjacent Sea (41°–43° S), Chilean Patagonia

Yevenes

Bello

Sanhueza-Guevara

2016

Estuaries and Coasts

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“…This is in agreement with the faster in situ rates of N 2 O consumption observed in well‐drained soils under American beech in the OGF compared to well‐drained soils in the SMF (Figure 5). Both denitrifier and nitrifier denitrification may have been responsible for atmospheric N 2 O consumption [ Wrage et al , 2001; Vieten et al , 2008] and Castro et al [1993] also reported N 2 O consumption in spruce‐fir forest soils under condition of low soil NO 3 concentration and high soil moisture. Dong et al [1998], Goossens et al [2001] and Peichle et al [2010] also observed consumption of N 2 O in temperate deciduous forest soils ranging from −14 to −1584 g N μ g m −2 d −1 .…”

Section: Discussionmentioning

confidence: 99%

Biogeochemical controls on methane, nitrous oxide, and carbon dioxide fluxes from deciduous forest soils in eastern Canada

Ullah¹,

Moore²

2011

J. Geophys. Res.

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[1] The exchange of the important trace gases, methane (CH 4 ), nitrous oxide (N 2 O), and carbon dioxide (CO 2 ), between forested soils and the atmosphere can show great temporal and spatial variability. We measured the flux of these three gases over 2 years along catenas at two forested sites, to determine the important controls. Well-drained soils consumed atmospheric CH 4 , while poorly drained swamp soils embedded in depressions were a source. CH 4 fluxes could be predicted primarily by temperature and moisture, and tree cover exerted an influence mainly through the creation of large soil porosity, leading to increased consumption rates. In contrast, there were very poor relationships between N 2 O fluxes and environmental variables, reflecting the complex interactions of microbial, edaphic, and N cycling processes, such as nitrification in well-drained soils and denitrification in poorly drained soils, which led to N 2 O production (or consumption) in soils and hence larger variability. At the broad temporal and spatial scale, soil C:N ratio was a good predictor of N 2 O emission rates, through its influence upon N cycling processes. Soil CO 2 emission rates showed less spatial and temporal variability, and were controlled by temperature and moisture. The source strength, in global warming potential of CH 4 and N 2 O fluxes in CO 2 equivalents, was reduced markedly when trace gas fluxes from 5 to 15% poorly drained soils were included in the net global warming potential calculation of whole forested watersheds. Soils drainage class integrates many of the biogeochemical processes controlling the flux of these gases providing a framework for extrapolating results.

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“…From July to October, under light conditions, besides the diffusing into marsh sediment directly, N 2 O could diffuse with O 2 from the stomata to the rhizosphere when S. mariqueter photosynthesized and the stomata were open, where it was consumed by coupled nitrify denitrification [ Vieten et al , 2008; Moseman‐Valtierra et al , 2011]. Under dark conditions, molecular diffusion was not the main transporting mechanism of N 2 O emission.…”

Section: Discussionmentioning

confidence: 99%

Effect of Scirpus mariqueter on nitrous oxide emissions from a subtropical monsoon estuarine wetland

Deng

et al. 2012

J. Geophys. Res.

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[1] The effects of the wetland plant Scirpus mariqueter on nitrous oxide (N 2 O) emissions in Yangtze estuary, China, were investigated using an in situ static chamber technique. Field measurements spanned the entire growing season (May to October) and encompassed a wide range of weather conditions typical of the subtropical monsoon climate of this region. Simultaneous measurement of carbon dioxide (CO 2 ) and anatomical measurements were conducted to experimentally determine the gas transport mechanisms of S. mariqueter on N 2 O flux. S. mariqueter had a significant effect on N 2 O flux. Based on the comparison of light-dark and clipped-unclipped gas flux, N 2 O flux was negatively correlated with NEE (p < 0.0001) and NPP (p < 0.001) under light conditions when S. mariqueter was present but positively with temperatures in the dark condition or when S. mariqueter was clipped. Besides the plant uptake corresponding to the N 2 O negative flux in light chamber, it is reasonable to assume that because of the limitation of nitrate in sediment, coupled nitrification-denitrification is the main process of N 2 O producing. O 2 transported into the S. mariqueter rhizosphere during photosynthesis stimulated denitrifier also would consume the N 2 O and would be induced to the N 2 O diffusing from atmosphere into sediment. Although photosynthetic activity of S. mariqueter attenuated N 2 O flux significantly over the course of the entire study period, creating a net sink for atmospheric

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The fate of N<sub>2</sub>O consumed in soils

Cited by 11 publications

References 18 publications

Spatial Distribution of Nitrous Oxide (N2O) in the Reloncaví Estuary–Sound and Adjacent Sea (41°–43° S), Chilean Patagonia

Spatial Distribution of Nitrous Oxide (N2O) in the Reloncaví Estuary–Sound and Adjacent Sea (41°–43° S), Chilean Patagonia

Biogeochemical controls on methane, nitrous oxide, and carbon dioxide fluxes from deciduous forest soils in eastern Canada

Effect of Scirpus mariqueter on nitrous oxide emissions from a subtropical monsoon estuarine wetland

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