Transient, Tidal Time-scale, Nitrogen Transformations in an Estuarine Turbidity Maximum—Fluid Mud System (The Gironde, South-west France)

Abril, Gwénaël; Riou, Stéphane; Etcheber, Henri; Frankignoulle, Michel; Wit, Rutger de; Middelburg, Jack J.

doi:10.1006/ecss.1999.0598

Cited by 101 publications

(74 citation statements)

References 43 publications

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“…6). Compared to other estuaries in the world, the maximum nitrifier density observed in the water column of the Pearl River Estuary was 3×10 3 cell mL −1 , which is close to the level in the fluid mud of the Gironde Estuary (4×10 3 cell mL −1 ) (Abril et al, 2000), but much lower than that in the Seine Estuary (Cébron and Garnier, 2005), where the nitrifier density is 3×10 7 cell mL −1 .…”

Section: Nitrifying Activity and Nitrifiersmentioning

confidence: 54%

“…The abundance of nitrifying bacteria (nitrifiers) was determined using the most probable number (MPN)-Griess technique (Abril et al, 2000;Man, 1975;Pauer and Auer, 2000). Prior to incubation, all the tubes, the culture media, and the NaCl solution (0.9%, for dilution) were sterilized in an autoclave at 120 • C for 20 min.…”

Section: Abundance Of Nitrifying Bacteriamentioning

confidence: 99%

“…However, nitrification rates in the Pearl River Estuary were lower than estuaries with high NH (de Bie et al, 2002;Somville, 1984). Elsewhere in the turbid water and fluid mud of the Gironde Estuary, the potential nitrification rate is very high, reaching 240-336 µmol N L −1 d −1 , although the NH + 4 concentration in the fluid mud is <15 µmol L −1 (Abril et al, 2000). This may suggest that nitrification reactions are also modulated by other environmental factors in addition to NH + 4 being the primary substrate.…”

Section: Nitrifying Activity and Nitrifiersmentioning

confidence: 99%

“…Particle aggregates provide microsites in which oxygen concentrations are usually lower than that in the surrounding waters, and this favors bacterial growth. The accumulation of particles in estuaries is shown to enhance the growth of the nitrifying population and nitrifying activity in the Gironde, Seine and Yellow River/Estuary (Abril et al, 2000;Brion et al, 2000;Xia et al, 2004). In August 2005, Station 2 showed a high nitrification rate despite a relatively low nitrifier density, which may be due to the high turbidity (total suspended solids (TSS) up to be 49 mg L −1 ).…”

Section: Nitrification Vs Nitrifier Activitymentioning

confidence: 99%

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Nitrification and inorganic nitrogen distribution in a large perturbed river/estuarine system: the Pearl River Estuary, China

Dai

Wang²,

Guo³

et al. 2008

Biogeosciences

227

176

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Abstract. We investigated the spatial distribution and seasonal variation of dissolved inorganic nitrogen in a large perturbed estuary, the Pearl River Estuary, based on three cruises conducted in winter (January 2005), summer (August 2005) and spring (March 2006). On-site incubation was also carried out for determining ammonium and nitrite oxidation rates (nitrification rates). We observed a year-round pattern of dramatic decrease in NH , accompanied by extremely high concentrations of ammonia (up to >800 µmol L −1 ) and nitrate (up to >300 µmol L −1 ). In summer, the upper estuary showed higher nitrification rates (ammonia oxidation rate ∼1.5-33.1 µmol N L −1 d −1 , nitrite oxidation rate ∼0.6-32.0 µmol N L −1 d −1 ) with lower concentrations of ammonia (<350 µmol L −1 ) and nitrate (<120 µmol L −1 ). The Most Probable Number test showed relatively lower nitrifier abundance in summer at most sampling stations, indicating a greater specific nitrification rate per cell in the warm season. Temperature appeared to control nitrification rates to a large degree in different seasons. Spatial variability of nitrification rates appeared to be controlled by a combination of many other factors such as nutrient concentrations, nitrifier abundance and dissolved oxygen (DO) concentrations. In addition to aerobic respiration, nitrification contributed significantly to the consumption of DO and production of free CO 2 at upper estuary. Nitrification-induced consumption accounted for up to approximately one third of the total waCorrespondence to: M. Dai (mdai@xmu.edu.cn) ter column community DO consumption in the upper estuary during the surveyed periods, boosting environmental stress on this large estuarine ecosystem.

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Section: Nitrifying Activity and Nitrifiersmentioning

confidence: 54%

Section: Abundance Of Nitrifying Bacteriamentioning

confidence: 99%

Section: Nitrifying Activity and Nitrifiersmentioning

confidence: 99%

Section: Nitrification Vs Nitrifier Activitymentioning

confidence: 99%

See 2 more Smart Citations

Nitrification and inorganic nitrogen distribution in a large perturbed river/estuarine system: the Pearl River Estuary, China

Dai

Wang²,

Guo³

et al. 2008

Biogeosciences

227

176

View full text Add to dashboard Cite

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“…This may be partly due to the fact that most previously published N 2 O data in Table 2 covered the full salinity range of 0-30 while N 2 O data in this study were mainly from the high salinity area (salinity of 20-30) of the Changjiang Estuary. High N 2 O were usually observed at the inner estuaries, especially at the low salinity in the vicinity of turbidity maximum zone (TMZ) (Barnes and Owens, 1999;Law et al, 1992;Abril et al, 2000). Turbidity maximum existed all year round in the river mouth of the Changjiang (Li and Chen, 1998).…”

Section: Computation Of Sea-to-air Fluxesmentioning

confidence: 99%

Nitrous oxide in the Changjiang (Yangtze River) Estuary and its adjacent marine area: Riverine input, sediment release and atmospheric fluxes

Zhang

Liu

et al. 2010

Biogeosciences

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Abstract. Dissolved nitrous oxide (N 2 O) was measured in the waters of the Changjiang (Yangtze River) Estuary and its adjacent marine area during five surveys covering the period of [2002][2003][2004][2005][2006]. Dissolved N 2 O concentrations ranged from 6.04 to 21.3 nM, and indicate great temporal and spatial variations. Distribution of N 2 O in the Changjiang Estuary was influenced by multiple factors and the key factor varied between cruises. Dissolved riverine N 2 O was observed monthly at station Xuliujing of the Changjiang, and ranged from 12.4 to 33.3 nM with an average of 19.4 ± 7.3 nM. N 2 O concentrations in the river waters showed obvious seasonal variations with higher values occurring in both summer and winter. Annual input of N 2 O from the Changjiang to the estuary was estimated to be 15.0 × 10 6 mol/yr. N 2 O emission rates from the sediments of the Changjiang Estuary in spring ranged from −1.88 to 2.02 µmol m −2 d −1 , which suggests that sediment can act as either a source or a sink of N 2 O in the Changjiang Estuary. Average annual sea-toair N 2 O fluxes from the studied area were estimated to be 7.7 ± 5.5, 15.1 ± 10.8 and 17.0 ± 12.6 µmol m −2 d −1 using LM86, W92 and RC01 relationships, respectively. Hence the Changjiang Estuary and its adjacent marine area are a net source of atmospheric N 2 O.

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The Amazon shelf sediments, a reactor that fuels intense nitrogen cycling at the seabed

Choisnard

Burtscher

Förster

et al. 2023

Limnology & Oceanography

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Large river plumes such as the Amazon River Plume are known as regions of intense biological, chemical, and physical forcing affecting the delivery and speciation of nutrients. On the shelf, sediments may act as a net source or sink of dissolved inorganic nitrogen (DIN) for the water column depending on the preservation of organic matter (OM) and its remineralization pathways in benthic environments. Previous studies on sediments of the Amazon shelf suggested that the seabed mainly acted as a sink of DIN, with denitrification as the main loss process. However, the Amazon Basin faced drastic changes over the past decades, with climate change, deforestation, and damming potentially impacting the DIN and OM loads to the estuary. These perturbations might have led to changes in benthic remineralization, calling for updates of previously studied benthic remineralization processes on the Amazon shelf. Our analysis of eight short cores confirmed the occurrence of intense recycling of mostly terrestrial material (> 60%) in the river mouth, and little organic carbon was remaining in shelf sediments. We measured a sediment oxygen demand of ~ 23 mmol m−2 d−1, which can explain the ammonification and nitrification of all the organic nitrogen (N) reaching the sediment, underlining the importance of the seabed as a sink for organic N species. Therefore, in spite of the changes in the Amazon Basin, nitrification still seems to be balanced by denitrification, as, similarly to previous results, no DIN diffused out of the sediment.

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Transient, Tidal Time-scale, Nitrogen Transformations in an Estuarine Turbidity Maximum—Fluid Mud System (The Gironde, South-west France)

Cited by 101 publications

References 43 publications

Nitrification and inorganic nitrogen distribution in a large perturbed river/estuarine system: the Pearl River Estuary, China

Nitrification and inorganic nitrogen distribution in a large perturbed river/estuarine system: the Pearl River Estuary, China

Nitrous oxide in the Changjiang (Yangtze River) Estuary and its adjacent marine area: Riverine input, sediment release and atmospheric fluxes

The Amazon shelf sediments, a reactor that fuels intense nitrogen cycling at the seabed

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