Phosphorus cycling in a coastal marine sediment, Aarhus Bay, Denmark

Jensen, Henning S.; Mortensen, Pål B.; Andersen, Frede Østergaard; Rasmussen, Erik Michael; Jensen, Annie Aarup

doi:10.4319/lo.1995.40.5.0908

Cited by 340 publications

(227 citation statements)

References 27 publications

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“…The overall sediment oxygen uptake at all four sites was in the same order of magnitude as reported from the southern and the western Baltic (Balzer 1984;Jensen et al 1995), the northern Baltic (Nedwell et al 1983), and the transition between the Baltic and the North Sea (Jørgensen and Revsbech 1989).…”

Section: Discussionsupporting

confidence: 61%

Seasonal oxygen, nitrogen and phosphorus benthic cycling along an impacted Baltic Sea estuary: regulation and spatial patterns

et al. 2014

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The regulatory roles of temperature, eutrophication and oxygen availability on benthic nitrogen (N) cycling and the stoichiometry of regenerated nitrogen and phosphorus (P) were explored along a Baltic Sea estuary affected by treated sewage discharge. Rates of sediment denitrification, anammox, dissimilatory nitrate reduction to ammonium (DNRA), nutrient exchange, oxygen (O 2 ) uptake and penetration were measured seasonally. Sediments not affected by the nutrient plume released by the sewage treatment plant (STP) showed a strong seasonality in rates of O 2 uptake and coupled nitrification-denitrification, with anammox never accounting for more than 20 % of the total dinitrogen (N 2 ) production. N cycling in sediments close to the STP was highly dependent on oxygen availability, which masked temperaturerelated effects. These sediments switched from low N loss and high ammonium (NH 4 ? ) efflux under hypoxic conditions in the fall, to a major N loss system in the winter when the sediment surface was oxidized. In the fall DNRA outcompeted denitrification as the main nitrate (NO 3 -) reduction pathway, resulting in N recycling and potential spreading of eutrophication. A comparison with historical records of nutrient discharge and denitrification indicated that the total N loss in the estuary has been tightly coupled to the total amount of nutrient discharge from the STP. Changes in dissolved inorganic nitrogen (DIN) released from the STP agreed well with variations in sedimentary N 2 removal. This indicates that denitrification and anammox efficiently counterbalance N loading in the estuary across the range of historical and present-day anthropogenic nutrient discharge. Overall low N/P ratios of the regenerated nutrient fluxes impose strong N limitation for the pelagic system and generate a high potential for nuisance cyanobacterial blooms.

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Section: Discussionsupporting

confidence: 61%

Seasonal oxygen, nitrogen and phosphorus benthic cycling along an impacted Baltic Sea estuary: regulation and spatial patterns

et al. 2014

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“…The difference was, however, not statistically significant, and the deposition and mineralization of organic Aquat Geochem (2016) 22:443-467 461 P are not temporally coupled to the benthic release of PO 4 3- (Jensen et al 1995). It is well established that Fe oxyhydroxides efficiently adsorb PO 4 3-, that upon reduction is released, typically in a ratio of 1:3 (Fe-P) (Gunners and Blomqvist 1997).…”

Section: Benthic Carbon and Nutrient Turnover In A Highly Irrigated Cmentioning

confidence: 99%

Benthic Carbon Mineralization and Nutrient Turnover in a Scottish Sea Loch: An Integrative In Situ Study

et al. 2016

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Based on in situ microprofiles, chamber incubations and eddy covariance measurements, we investigated the benthic carbon mineralization and nutrient regeneration in a *65-m-deep sedimentation basin of Loch Etive, UK. The sediment hosted a considerable amount of infauna that was dominated by the brittle star A. filiformis. The numerous burrows were intensively irrigated enhancing the benthic in situ O 2 uptake by *50 %, and inducing highly variable redox conditions and O 2 distribution in the surface sediment as also documented by complementary laboratory-based planar optode measurements. The average benthic O 2 exchange as derived by chamber incubations and the eddy covariance approach were similar (14.9 ± 2.5 and 13.1 ± 9.0 mmol m -2 day -1 ) providing confidence in the two measuring approaches. Moreover, the non-invasive eddy approach revealed a flow-dependent benthic O 2 flux that was partly ascribed to enhanced ventilation of infauna burrows during periods of elevated flow rates. The ratio in exchange rates of RCO 2 and O 2 was close to unity, confirming that the O 2 uptake was a good proxy for the benthic carbon mineralization in this setting. The infauna activity resulted in highly dynamic redox conditions that presumably facilitated an efficient degradation of both terrestrial and marine-derived organic material. The complex O 2 dynamics of the burrow environment also concurrently stimulated nitrification and coupled denitrification rates making the sediment an efficient sink for bioavailable nitrogen. Furthermore, bioturbation mediated a high efflux of dissolved phosphorus and silicate. The study documents a high spatial and temporal variation in benthic solute exchange with important implications for benthic turnover of organic carbon and nutrients. However, more long-term in situ investigations with like approaches are required to fully understand how environmental events and spatio-temporal variations interrelate to the overall biogeochemical functioning of coastal sediments.

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“…Jensen et al 1995). The burial efficiency of a sediment for P is thought to be influenced by a wide range of factors, including, for example, the rate of sediment accumulation, the b o t t o m -w a t e r r e d o x c o n d i t i o n s , t h e i n p u t o f Fe-(oxyhydr)oxides to a sediment and whether or not sinkswitching to authigenic Ca-P occurs (e.g.…”

Section: Burial Efficiency Of Pmentioning

confidence: 99%

“…The burial efficiency of total P, defined here as the percentage of the total P input at the sediment-water interface that is buried below 10-cm depth; (Jensen et al 1995) and of reactive P ('biologically available' P; (Ruttenberg 2003) was calculated from the burial rate of P at a depth of 10 cm and the measured phosphate efflux from the sediment following:…”

Section: Burial Efficiency Of Pmentioning

confidence: 99%

“…The burial efficiency is calculated as the percentage of the total input that is buried below a depth of 10 cm (e.g. Jensen et al 1995) (Ex-P + Fe-P + P org ) Burial efficiency 18 13 10 % Organic carbon and total P concentrations in the sediments deposited since the closure of the estuary, generally decline gradually with depth, with the exception of a maximum at the sediment-water interface and a number of smaller maxima in the upper 30 cm of the sediment (Fig. 13).…”

Section: Historical Records Of Oxygen Nutrients Chlorophyll-a and Cmentioning

confidence: 99%

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Phosphorus Cycling and Burial in Sediments of a Seasonally Hypoxic Marine Basin

Sulu-Gambari

Hagens

Behrends

et al. 2017

Estuaries and Coasts

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Recycling of phosphorus (P) from sediments contributes to the development of bottom-water hypoxia in many coastal systems. Here, we present results of a year-long assessment of P dynamics in sediments of a seasonally hypoxic coastal marine basin (Lake Grevelingen, the Netherlands) in 2012. Sequential phosphorus extractions (SEDEX) and X-ray absorption spectroscopy (XAS) indicate that P was adsorbed to Fe-(III)-(oxyhydr)oxides when cable bacteria were active in the surface sediments in spring. With the onset of summer h y p o x i a , s u l p h i d e -i n d u c e d d i s s o l u t i o n o f t h e Fe-(III)-(oxyhydr)oxides led to P release to the pore water and overlying water. The similarity in authigenic Ca-P concentrations in the sediment and suspended matter suggest that Ca-P is not formed in situ. The P burial efficiency was ≤ 32%. Hypoxia-driven sedimentary P recycling had a major impact on the water-column chemistry in the basin in 2012. Watercolumn monitoring data indicate up to ninefold higher surface water concentrations of phosphate in the basin in the late 1970s and a stronger hypoxia-driven seasonal P release from the sediment. The amplified release of P from the sediment in the past is attributed to the presence of a larger pool of Febound P in the basin prior to the first onset of hypoxia. Given that P is not limiting, primary production in the basin has not been affected by the decadal changes in P availability and recycling over the past 40 years. The changes in P dynamics on decadal time scales were not recorded in sediment profiles of total P or organic C/total P.

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Phosphorus cycling in a coastal marine sediment, Aarhus Bay, Denmark

Cited by 340 publications

References 27 publications

Seasonal oxygen, nitrogen and phosphorus benthic cycling along an impacted Baltic Sea estuary: regulation and spatial patterns

Seasonal oxygen, nitrogen and phosphorus benthic cycling along an impacted Baltic Sea estuary: regulation and spatial patterns

Benthic Carbon Mineralization and Nutrient Turnover in a Scottish Sea Loch: An Integrative In Situ Study

Phosphorus Cycling and Burial in Sediments of a Seasonally Hypoxic Marine Basin

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