Sorption and release of phosphorus in a peaty sediment

Keizer, Peer; Buysman, M. C. N. P.; Cappenberg, T.E.

doi:10.1080/03680770.1989.11898836

Cited by 4 publications

(6 citation statements)

References 8 publications

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“…The modelled diffusive flux approximately equals the flux measured in sediment cores (Boers & Van Hese, 1988;Keizer et al, 1991); it has decreased a little since the restoration measures (Figs. 9 and 10).…”

Section: Simulationsmentioning

confidence: 58%

“…Ryding & Forsberg, 1977;De Pinto, 1981;Sas, 1989). In Lake Loosdrecht, where the direct phosphorus mobilisation due to diffusion is very small (Keizer et al, 1991) the cause of the decreased retention lies in the high efficiency of phosphorus utilisation by the phytoplankton and in the high resuspension. The observed retention coefficients comply with empirical relations with lake depth and water retention time (OECD, 1982;Lijklema et al, 1988;Sas, 1989).…”

Section: Discussionmentioning

confidence: 99%

“…The dissolved phosphorus in the interstitial water is again assumed to be in chemical equilibrium with the adsorbed form. However, since the anoxic conditions in most of the sediment except in the upper few millimeters, the adsorption capacity of the sediment is less than that in the water (Keizer et al, 1991). Dissolved phosphorus can diffuse from the pore water to the surface water or can get lost by downward seepage.…”

Section: Processes In the Sedimentmentioning

confidence: 99%

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A mathematical model of the phosphorus cycle in Lake Loosdrecht and simulation of additional measures

1992

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The phosphorus cycle in the ecosystem of the shallow, hypertrophic Loosdrecht lakes (The Netherlands) was simulated by means of the dynamic eutrophication model PCLOOS. The model comprises three algal groups, zooplankton, fish, detritus, zoobenthos, sediment detritus and some inorganic phosphorus fractions. All organic compartments are modelled in two elements, carbon and phosphorus. Within the model system, the phosphorus cycle is considered as completely closed. Carbon and phosphorus are described independently, so that the dynamics of the P/C ratios can be modelled. The model has been partly calibrated by a method based on Bayesian statistics combined with a Range Check procedure.Simulations were carried out for Lake Loosdrecht for the periods before and after the restoration measures in 1984, which reduced the external phosphorus loading to the lake from ca. 2 mgP m-* d-' to lmgPm-*d-l.The model outcome was largely comparable with the measured data. Total phosphorus has slowly decreased from an average 130 PgP l-' to ca. 80 PgP l-', but chlorophyll-a (ca. 15opg1-', summer-averaged) and seston concentrations (8-15 mgC l-') hardly changed since the restoration measures. About two-thirds of the seston consisted of detritus, while the phytoplankton remained dominated by filamentous cyanobacteria. The P/C ratio of the seston decreased from ca. 1.0% to 0.7 %, while the P/C ratios of zooplankton, zoobenthos and fish have remained constant and are much higher. The system showed a delayed response to the decreased phosphorus loading until a new equilibrium was reached in ca. five years. Major reasons for the observed resilience of the lake in responding to the load reduction are the high phosphorus assimilation efficiency of the cyanobacteria and the high internal recycling of phosphorus. A further reduction of nutrient loading, perhaps in combination with additional measures like biomanipulation, will be the most fruitful additional restoration measure.

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Section: Simulationsmentioning

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Section: Processes In the Sedimentmentioning

confidence: 99%

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A mathematical model of the phosphorus cycle in Lake Loosdrecht and simulation of additional measures

1992

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“…However, recent analyses revealed that only 10% of the estimated total phosphorus loading of the past 50 years is found back in the upper 10 cm of the sediment. The remainder could have been washed out by downward seepage (KEIZER and BUYSMAN, 1990). Finally, direct adsorption of phosphorus to detrital particles and subsequent slow release could be an extra resiliating factor by creating an extra phosphorus pool in the system (RIJKEBOER et a/., 1988).…”

Section: Net P Loss = External P Loading-p Outflow [Mgpm-2d -1]mentioning

confidence: 98%

Modelling phosphorus fluxes in the hypertrophic Loosdrecht Lakes

Janse

Aldenberg

1990

Hydrobiological Bulletin

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A dynamic, deterministic model is presented to simulate the phosphorus cycle and plankton growth in the shallow, hypertrophic Loosdrecht Lakes (The Netherlands) before and after restoration measures. Besides inorganic phosphorus (SRP) in both the surface water and the interstitial water, the model comprises three algal groups, zooplankton, fish, detritus, zoobenthos and upper sediment (all modelled both in carbon and in phosphorus). Within the model system, the phosphorus cycle is completely closed. Carbon and phosphorus are described independently, so that the dynamics of the P/C ratios can be modelled. Sediment processes are described in a simplified form.Simulated values are largely within the range of observed ones. The detrital fraction of the seston (= phytoplankton + detritus) varies from 50-60% in summer to about 90% in winter. SRP in the surface water is very low during most of the year. Sensitivity for external phosphorus input is larger for algal and detrital P than for algal and detrital C and chlorophyll-a. So the P/C ratio of the seston decreases following restoration measures, as is observed in the lakes, while the much higher P/C ratios of zooplankton and fish remain constant. Phosphorus mobilisation from the sediment decreases with decreasing external input. Adaptation of the model system to the reduced loading takes place within about two years.Sources of uncertainty in the model include the limited knowledge on selective grazing as well as ~on mortality and mineralisation processes.

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“…As a result of its morphometry (area 14.5 km 2, mean depth 1.8 m) and continuous wind-induced turbulence, the surface layer of the sediment remains aerobic throughout the year. Previous studies of the lake include investigations of primary production [29], porewater chemistry [22], phosphorus release from the sediment [ 12], and restoration perspectives [ 13].…”

Section: Sediment Samplingmentioning

confidence: 99%

Methane oxidation by methanotrophs and its effects on the phosphate flux over the sediment-water interface in a eutrophic lake

et al. 1992

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The effect of methane oxidation in aerobic sediment on oxygen consumption and phosphate flux was investigated in diffusion chambers. The diffusion chambers consisted of two compartments separated by a Teflon membrane. In the upper chamber a thin sediment layer was present and the lower chamber was continuously flushed with gas. The hydrophobic membrane allowed for diffusion of gases from the lower chamber through the sediment layer toward the headspace of the upper chamber. In experiments with a methane oxidation rate of 9.8 mmol m(-2) day(-1), the oxygen consumption rate increased by a factor of two compared with controls without methane oxidation (8.6 vs 17.7 mmol m(-2) day(-1)). Methane oxidation significantly decreased oxygen penetration depth (2.5-4.0 vs 1.0-2.0 mm). However, despite the shrinkage of the oxidized microlayer, no differences were found in phosphate flux across the sediment water interface. Batch experiments with standard additions of methane revealed that the growth of methanotrophic bacteria contributes to the phosphate uptake of aerobic sediment. From the batch experiments a molar ratio of carbon to phosphate of 45 mol:mol was calculated for the growth of methanotrophs. Results suggest that a decrease in chemical phosphate adsorption caused by a decrease in the oxygen penetration depth could be compensated for entirely by the growth of methanotrophic bacteria.

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Sorption and release of phosphorus in a peaty sediment

Cited by 4 publications

References 8 publications

A mathematical model of the phosphorus cycle in Lake Loosdrecht and simulation of additional measures

A mathematical model of the phosphorus cycle in Lake Loosdrecht and simulation of additional measures

Modelling phosphorus fluxes in the hypertrophic Loosdrecht Lakes

Methane oxidation by methanotrophs and its effects on the phosphate flux over the sediment-water interface in a eutrophic lake

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