Diurnal variation of nitrogen cycling in coastal, marine sediments

Jensen, Hanne Bak; Jørgensen, Kirsten S.; Sørensen, Jan

doi:10.1007/bf00394726

Cited by 64 publications

(28 citation statements)

References 27 publications

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“…In general, the measured SOD values and pore-water nutrient profiles typified those measured in other estuarine and ocean environments, such as those reported by Aller (1980), Berner (1980), Jenkins and Kemp (1984), Jensen et al (1995), Jorgensen and Sorensen (1985), Klump and Martens (1981), Schulz (2006), and Zimmerman, Montgomery, and Carlson (1985) among others. The SOD measurements demonstrate that a large potential exists for O 2 uptake by the sediment, thereby explaining the reported sag in water column DO during the summer.…”

Section: Discussionsupporting

confidence: 77%

In Situ Benthic Nutrient Flux and Sediment Oxygen Demand in Barnegat Bay, New Jersey

Wilson

dePaul

2017

Journal of Coastal Research

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Section: Discussionsupporting

confidence: 77%

In Situ Benthic Nutrient Flux and Sediment Oxygen Demand in Barnegat Bay, New Jersey

Wilson

dePaul

2017

Journal of Coastal Research

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“…Emission rates of N 2 0 from the sediment were measured directly on cores as described by Jensen et al (1984). Water and air volumes of 25 m1 each were maintained over the sediment and the water was stirred to facilitate a natural gas exchange.…”

Section: Methodsmentioning

confidence: 99%

Seasonal cycles of 02, N03- and S042- reduction in estuarine sediments: the significance of an N03- reduction maximum in spring

Jørgensen¹,

Sørensen²

1985

Mar. Ecol. Prog. Ser.

163

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Rates of oxygen uptake, denitrification, nitrate reduction to ammonia, and sulfate reduction were measured in a Danish estuary over 1.5 yr. In sediments near the sea entrance, O2 and SO?, -reduction dominated and the relative contributions of the 4 processes were 65, 3. 5 and 27 %. respectively, of the total electron flow. In sediments near the river outlet, sulfate became limiting while nitrate was more abundant. This shifted the relative contributions towards nitrate reduction: 44. 4, 33 and 19%, respectively. At low salinities, depth of the sulfate reduction zone (4 to 10 cm), but not maximum reduction rate, was limited by low sulfate concentrations in the overlying water. The nitrate zone varied from 0.5 to 5 cm depth over the year. Oxygen uptake and sulfate reduction varied seasonally in accordance with temperature. Reduction of nitrate to N, and to NH:, as well as emission of N,O the atmosphere, showed a short maximum in spring and were relatively constant throughout the rest of the year. The spring maximum coincided with a rapid water-temperature increase and a high influx of nitrate from the main river. Annual emission of N 2 0 corresponded to only 1 to 5 % of the measured denitrification. Annual loss of combined nitrogen by denitrification in sediments corresponded to 5 % of nitrate influx from the river.

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“…The microphytobenthic oxygen production in our laboratory study is thus not unrealistically high compared with in situ conditions at a depth of 15 m. As the Kattegat has a mean depth of only 23 m, the microphytobenthic algae may play a significant role in the regulation of oxygen conditions at the sedimentwater interface, as well as the nutrient exchange processes The effect of microphytobenthic algae on oxygen conditions may be more dramatic than our measurements indicate, because die1 changes in the interstitial water in the top few mm of the sediment may be much larger due to altered light conditions than the changes in the overlying water measured in this study (cf. Revsbech & Jargensen 1986, Jensen et al 1984.…”

Section: Oxygen Fluxmentioning

confidence: 99%

“…Consequently, some recent investigations, both in marine and fresh water areas, have aimed at demonstrating the effect of benthic microalgae on sediment-water nutrient flux by comparing flux rates under different light conditions (Andersen & Kristensen 1988, Carlton & Wetzel 1988, Kelderman et al 1988, Sundback & Graneli 1988, Rizzo 1990 or by manipulating benthic microalgal abundance in situ (Hansson 1989). Microalgal influence on sediment-water nutrient flux has been shown to be due both to nutrient uptake and the oxygenation of the sediment/water interface by microalgal photosynthesis (Jensen et al 1984, Andersen & Kristensen 1988, Carlton & Wetzel 1988.…”

Section: Introductionmentioning

confidence: 99%

Influence of sublittoral microphytobenthos on the oxygen and nutrient flux between sediment and water. A laboratory continuous-flow study

Sundbäck¹,

Enoksson²,

Granéli³

et al. 1991

Mar. Ecol. Prog. Ser.

164

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Influence of sublittoral microphytobenthos on the flux of oxygen and inorganic nutrients ( N , P, Si) at the sediment-water interface was studied using undisturbed cores of sandy and muddy sediment incubated in a laboratory continuous-flow system, either in darkness or with a 16/8 h L/D cycle at in situ light level during summer. Sediment was collected In July at 15 m depth in a non-tidal, stratified bay in SE Kattegat. To test whether the higher content of inorganic nutrients below the halocline, compared with surface waters, could stimulate microphytobenthic growth, 2 levels of nutrient concentrations were used. Diel variations were found In L/D cores, but not in darkened cores, for oxygen, dissolved inorganic nitrogen and phosphorus content in the water overlying the sediment. The flux of NH4+, NO3-and ~0~~-out of the sediment decreased during light periods and occasionally a net uptake was recorded. Light-induced O2 production, and correlations between A fluxes (differences between day and night fluxes of 0, and nutrients), chlorophyll a content and algal cell numbers in the sediment, indicate that the decreased outflux of IN and POA3-was mediated by photosynthetic organisms. Diel variations were not studied for silicon, but a significantly lower outflux, or even an uptake, of Si(OH), from L/D cores supports this conclusion. This suggests that diatoms play a major role in the nutrient flux between sediment and water. Also, the differences in pore-water nutrient gradients between LID and dark cores point to the importance of sediment-associated organisms. Daily (24 h) net fluxes of nutrients were primarily out of the sediment, but the magnitude depended on both light conditions and sediment type. Daily net outflux was significantly lower in U D cores than in darkened cores for all nutrients except NO3-in muddy cores and NO2-in sandy cores. Net uptake in L/D cores was recorded for Si(OH)4 and NO3-In sandy sediment. Outflux of nutrients was significantly higher from muddy sediments in comparison w~t h sandy sediments (except NO3-), especially in permanent darkness. No significant effect of nutrient enrichment on the abundance of sublittoral benthic microalgae could be shown. Results suggest that m~crophytobenthos can influence sediment-water exchange of inorganic nutrients even at sublittoral depths, and when measuring nutrient flux in permanently darkened cores from depths around 15 m in the Kattegat, summer flux rates will be overestimated by a factor varying between 2 and 6, depending on sediment type.

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Diurnal variation of nitrogen cycling in coastal, marine sediments

Cited by 64 publications

References 27 publications

In Situ Benthic Nutrient Flux and Sediment Oxygen Demand in Barnegat Bay, New Jersey

In Situ Benthic Nutrient Flux and Sediment Oxygen Demand in Barnegat Bay, New Jersey

Seasonal cycles of 02, N03- and S042- reduction in estuarine sediments: the significance of an N03- reduction maximum in spring

Influence of sublittoral microphytobenthos on the oxygen and nutrient flux between sediment and water. A laboratory continuous-flow study

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