The Release of Nitrous Oxide from the Intertidal Zones of Two European Estuaries in Response to Increased Ammonium and Nitrate Loading

Kenny, C.; Yamulki, S.; Blackwell, Martin; Maltby, E.; French, Peter; Bírgand, François

doi:10.1007/s11267-004-3014-4

Cited by 16 publications

(9 citation statements)

References 10 publications

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“…Therefore, more N 2 O could be produced due to high nitrogen loads, which can be found in other studies (Wang et al, 2009;Kenny et al, 2004). For example, in the incubation study of LaMontagne et al (2003), a statistically significant positive correlation of dissolved N 2 O concentrations to nitrate concentrations was detected (r 2 = 0.872, P<0.0001).…”

Section: Seasonal Variations Of Dissolved N 2 O and Fluxessupporting

confidence: 53%

Seasonal and diurnal variations in N2O concentrations and fluxes from three eutrophic rivers in Southeast China

Yang

Yan

et al. 2011

J. Geogr. Sci.

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This study was performed at three eutrophic rivers in Southeast China aiming to determine the magnitude and patterns of dissolved N 2 O concentrations and fluxes over a seasonal (in 2009) and diurnal (24 h) temporal scale. The results showed that N 2 O concentrations varied from 0.28 to 0.38 (mean 0.32±0.04), 0.29 to 0.46 (mean 0.37±0.07), and 2.07 to 3.47 (mean 2.84±0.63) μg N-N 2 O L −1 in the Fengle, Hangbu and Nanfei rivers, respectively, in the diurnal study performed during the summer of 2008. The study found that mean N 2 O concentration and estimated N 2 O flux (67.89 ± 6.71 µg N-N 2 O m −2 h −1 ) measured from the Nanfei River with serious urban wastewater pollution was significantly higher than those from the Fengle and the Hangbu Rivers with agricultural runoff. In addition, the seasonal study during June and December of 2009 also showed that the mean N 2 O concentration (10.59±14.67 μg N-N 2 O L −1 ) and flux (236.87±449.74 µg N-N 2 O m −2 h −1 ) observed from the Nanfei River were significantly higher than those from the other two rivers. Our study demonstrated both N 2 O concentrations and fluxes exhibited seasonal and diurnal fluctuations. Over three consecutive days during the summer of 2008, N 2 O accumulation rates varied within the range of 3.91-7.21, 2.76-15.71, and 3.23-30.03 µg N-N 2 O m −2 h −1 for the Fengle, Hangbu and Nanfei Rivers, respectively, and exponentially decreased with time.

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Section: Seasonal Variations Of Dissolved N 2 O and Fluxessupporting

confidence: 53%

Seasonal and diurnal variations in N2O concentrations and fluxes from three eutrophic rivers in Southeast China

Yang

Yan

et al. 2011

J. Geogr. Sci.

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“…In the SJ and CM rivers, N 2 O concentration did not significantly correlate with NH 4 + concentration, but had significant positive correlation with NO 2 − con- [50,56,57,59] . N 2 O was mainly produced in sediment and then diffused into river water [46,57] .…”

Section: Effect Of Water Environmental Factors On N 2 O Concentrationmentioning

confidence: 82%

Methane and nitrous oxide concentration and emission flux of Yangtze Delta plain river net

Wang

Chen

Sun

et al. 2009

Sci. China Ser. B-Chem.

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Methane (CH 4 ) and nitrous oxide (N 2 O) saturation concentration and gas-water interface emission fluxin surface water of the Yangtze Delta plain river net were investigated in summer at representative sites including the upper reaches of the Huangpu River and the rivers in the Chongming Island. The results show that the CH 4 concentration in river water ranged from 0.30±0.03 to 6.66±0.14 μmol⋅L −1 , and N 2 O concentration ranged from 13.8±2.33 to 435±116 nmol⋅L −1 . River surface water had a very high saturation level of CH 4 (from 468±49.0% to 11560±235%) and that of N 2 O (from 175±29.5% to 4914±1304%). Dissolved oxygen (DO) was the primary factor controlling the CH 4 concentration in water. N 2 O concentration had significant negative correlation with salinity and a significant positive correlation with nitrate (NO 3 − ), nitrite (NO 2 − ), chemical oxygen demand (CODcr) concentration and pH of river water. CH 4 and N 2 O of river water were brought about mainly by methanogenesis and denitrification in river bottom sediment that diffused through sediment-water interface into the water body and then into atmosphere through the gas-water interface. The emission flux of CH 4 and N 2 O at river gas-water interface reached 778±59.8 and 236±63.6 μmol⋅m −2 ⋅h −1 , respectively in summer. The river net was a potential source of atmospheric CH 4 and N 2 O because of eutrophication of the water body.plain river net, CH 4 , N 2 O, concentration, gas-water interface, emission flux

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“…Higher ratios of denitrification potential to N input, ratios of 3 and 6, were described in Belfast and Strangford Loughs, Ireland by Livingstone et al (2000). Increased N 2 O production rates have been reported to be associated with more eutrophic environments coupled to high NO 3 À availability and consequently to higher denitrification rates (Seitzinger and Nixon, 1985;Middelburg et al, 1995;Kenny et al, 2004). In this study, however, N 2 O production was related to sediment organic matter content, and interestingly the highest N 2 O production did not coincide with the highest denitrification rates.…”

Section: Discussionmentioning

confidence: 96%

Potential rates and environmental controls of denitrification and nitrous oxide production in a temperate urbanized estuary

Teixeira

Magalhães

Boaventura

et al. 2010

Marine Environmental Research

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tial rates and environmental controls of denitrification and nitrous oxide production in a temperate urbanized estuary.Marine Environmental Research, Elsevier, 2010, 70 (5) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. The Douro estuary (NW Portugal) suffers from both problems: freshwater input of 19 nitrate and organic load from untreated wastewater discharges. To assess how these 20 factors might control sediment denitrification, a 12-month survey was designed. 21Denitrification potential and nitrous oxide (N 2 O) production were measured at different 22 locations using the slurry acetylene blockage technique. Denitrification rate ranged from 23 0.4 to 38 nmol N g -1 h -1 , increasing towards the river mouth following an urban 24 pollution gradient. N 2 O production, a powerful greenhouse gas implicated on the 25 destruction of the ozone layer, was significantly related with sediment organic matter 26 and accounted for 0.5 -47 % of the N gases produced. Additional enrichment 27 experiments were consistent with the results found in the environment, showing that 28 sediments from the upper less urban stretch of the estuary, mostly sandy, respond 29

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The Release of Nitrous Oxide from the Intertidal Zones of Two European Estuaries in Response to Increased Ammonium and Nitrate Loading

Cited by 16 publications

References 10 publications

Seasonal and diurnal variations in N2O concentrations and fluxes from three eutrophic rivers in Southeast China

Seasonal and diurnal variations in N2O concentrations and fluxes from three eutrophic rivers in Southeast China

Methane and nitrous oxide concentration and emission flux of Yangtze Delta plain river net

Potential rates and environmental controls of denitrification and nitrous oxide production in a temperate urbanized estuary

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