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/s11267-005-3014-z

Cited by 7 publications

(9 citation statements)

References 11 publications

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“…Our study on N 2 O flux at Bhitarkanika mangrove showed highest emission during postmonsoon, which is predominantly due to the availability of highly nitrogenous compound (Corredor et al . 1999; Kenny et al . 2004).…”

Section: Discussionmentioning

confidence: 99%

Assessment of methane and nitrous oxide flux from mangroves along Eastern coast of India

2008

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Mangroves are considered to be a minor source of greenhouse gases (CH 4 and N 2 O) in pristine environmental condition. However, estimates of efflux suggest that anthropogenic activities have led to a pronounced increase in greenhouse gas emission. Along the east coast of India, mangroves vary substantially in area, physiography and freshwater input, which ultimately modify the biogeochemical processes operating within this ecosystem. An attempt has here been made to elucidate the existing variation and role of climatic variability on the emission of greenhouse gases from mangroves. The flux estimates of CH 4 and N 2 O have been quantified from Bhitarkanika mangrove accounting for spatial and temporal (seasonal) variation. The annual rates were estimated to be 0.096 · 10 9 g CH 4 year )1 and 5.8 · 10 3 g N 2 O year )1 for the whole mangrove area of the east coast of India. Upscaling these estimates yield an annual emission of 1.95 · 10 12 g CH 4 year )1 and 1.1 · 10 11 g N 2 O year )1 from worldwide mangrove areas. The influence of elevated nutrient inputs through anthropogenic influence enhances the emission of greenhouse gas. The present article shows the need to develop an inventory on greenhouse gas flux from mangrove ecosystem.

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Section: Discussionmentioning

confidence: 99%

Assessment of methane and nitrous oxide flux from mangroves along Eastern coast of India

2008

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“…Some studies observe estuarine bacterial activity directly, through incubation experiments (Kenny et al., ; Alongi et al., ; Chen et al., ), but most focus on the production of N 2 O, rather than consumption, so it is difficult to quantify the relative amount of these processes. However, significant negative N 2 O fluxes are recorded (e.g., Kreuzwieser et al., ; LaMontagne et al., ; Rajkumar et al., ; Adams et al., ).…”

Section: Controlling Factorsmentioning

confidence: 99%

Nitrous oxide fluxes in estuarine environments: response to global change

Murray

Erler

Eyre

2015

Global Change Biology

201

163

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Nitrous oxide is a powerful, long-lived greenhouse gas, but we know little about the role of estuarine areas in the global N2 O budget. This review summarizes 56 studies of N2 O fluxes and associated biogeochemical controlling factors in estuarine open waters, salt marshes, mangroves, and intertidal sediments. The majority of in situ N2 O production occurs as a result of sediment denitrification, although the water column contributes N2 O through nitrification in suspended particles. The most important factors controlling N2 O fluxes seem to be dissolved inorganic nitrogen (DIN) and oxygen availability, which in turn are affected by tidal cycles, groundwater inputs, and macrophyte density. The heterogeneity of coastal environments leads to a high variability in observations, but on average estuarine open water, intertidal and vegetated environments are sites of a small positive N2 O flux to the atmosphere (range 0.15-0.91; median 0.31; Tg N2 O-N yr(-1) ). Global changes in macrophyte distribution and anthropogenic nitrogen loading are expected to increase N2 O emissions from estuaries. We estimate that a doubling of current median NO3 (-) concentrations would increase the global estuary water-air N2 O flux by about 0.45 Tg N2 O-N yr(-1) or about 190%. A loss of 50% of mangrove habitat, being converted to unvegetated intertidal area, would result in a net decrease in N2 O emissions of 0.002 Tg N2 O-N yr(-1) . In contrast, conversion of 50% of salt marsh to unvegetated area would result in a net increase of 0.001 Tg N2 O-N yr(-1) . Decreased oxygen concentrations may inhibit production of N2 O by nitrification; however, sediment denitrification and the associated ratio of N2 O:N2 is expected to increase.

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“…Teixeira et al [21] found that N 2 O emissions at the sediment-water interface increased with seawater salinity. Kenny et al [22] found a strong positive correlation between N 2 O emission rates and ammonium concentration in a study concerning sediment nitrate concentrations in water, while Beaulieu et al [23] found no relationship between N 2 O yield and aquatic N-NO 3 in American streams.…”

Section: Introductionmentioning

confidence: 99%

“…Significantly different nitrification and denitrification rates and N 2 O emissions have been reported at the sediment-water interface in different aquatic ecosystems due to high ecosystem complexity and differences between given locations: such differences can occur even between two bodies of water in the same location [24,25]. In this study, from August 2014 to July 2015, we examined nitrification and denitrification rates and N 2 O fluxes at the sediment-water interface in Taihu Lake, a large and important lake in China where few studies [20][21][22] have focused on these processes, allowing us to determine the dominant N 2 O emission process.…”

Section: Introductionmentioning

confidence: 99%

N2O Fluxes and Rates of Nitrification and Denitrification at the Sediment–Water Interface in Taihu Lake, China

Liu

Zhong

Zheng

et al. 2018

Water

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Because of global concerns regarding pollution and eutrophication in fresh water, China's Taihu Lake has gained attention both for these issues and as a source of nitrous oxide (N 2 O) emissions. In this study, we investigated N 2 O fluxes and nitrification and denitrification rates at the sediment-water interface and analyzed monthly the relationships between these processes in different areas of Taihu Lake over a one-year period. Annual maximum nitrification and denitrification rate and N 2 O flux were observed during June in an algae-dominated area of the lake and measured 17.80, 235.51, and 31.49 µmol N m −2 h −1 , respectively. The nitrification rate ranged from 0 to 1.18 µmol N m −2 h −1 at other sampling sites, with less variation. The denitrification rate showed clear seasonal variation, with lower levels between August and January (0.01-8.57 µmol N m −2 h −1 ; average = 1.49 µmol N m −2 h −1) and a rapid increase between February and July (1.03-235.51 µmol N m −2 h −1 ; average = 41.73 µmol N m −2 h −1).The N 2 O flux ranged from −0.64 to 1.5 µmol N m −2 h −1 , with little variability except for a much higher rate (31.49 µmol N m −2 h −1) in June in algae-dominated areas. N 2 O flux was significantly positively correlated with nitrification and denitrification rates in most lake zones. By comparing the slopes of the regression equations, we found that N 2 O emissions from the sediment-water interface were influenced predominantly by nitrification, suggesting that lower N 2 O fluxes from the sediment-water interface in Taihu Lake are caused primarily by lower nitrification rates.

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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 7 publications

References 11 publications

Assessment of methane and nitrous oxide flux from mangroves along Eastern coast of India

Assessment of methane and nitrous oxide flux from mangroves along Eastern coast of India

Nitrous oxide fluxes in estuarine environments: response to global change

N2O Fluxes and Rates of Nitrification and Denitrification at the Sediment–Water Interface in Taihu Lake, China

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