Nitrogen Loss and Denitrification as Studied in Relation to Reductions in Nitrogen Loading in a Shallow, Hypertrophic Lake (Lake Søbygård, Denmark)

Jensen, Jens Peder; Kristensen, Peter; Christensen, Peter Bondo; Søndergaard, Martin

doi:10.1002/iroh.19920770104

Cited by 61 publications

(37 citation statements)

References 27 publications

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“…The extent of annual denitrification previously reported for Lake Søbygaard (35%-47% of total annual N loading [27]) was not fully achieved in this study (only 14%-35% of total annual N loading), which may explain why simulations did not fully reproduce minima of TN and inorganic N fractions during summer ( Figure 2C-E). Regular resuspension events caused by wind-induced shear stress and biological disturbances are known to have a major impact on the sediment-water nutrient exchange including nitrogen [48][49][50], subsequently enhancing denitrification [27,51]. Thus, low denitrification levels might be due to the relatively simple and empirical-based description of resuspension in PCLake [23].…”

Section: Model Calibration and Performancecontrasting

confidence: 68%

Climate Change Will Make Recovery from Eutrophication More Difficult in Shallow Danish Lake Søbygaard

Rolighed

Søndergaard

Bjerring

et al. 2016

Water

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Abstract:Complex lake ecosystem models can assist lake managers in developing management plans counteracting the eutrophication symptoms that are expected to be a result of climate change. We applied the ecological model PCLake based on 22 years of data from shallow, eutrophic Lake Søbygaard, Denmark and simulated multiple combinations of increasing temperatures (0-6 • C), reduced external nutrient loads (0%-98%) with and without internal phosphorus loading. Simulations suggest nitrogen to be the main limiting nutrient for primary production, reflecting ample phosphorus release from the sediment. The nutrient loading reduction scenarios predicted increased diatom dominance, accompanied by an increase in the zooplankton:phytoplankton biomass ratio. Simulations generally showed phytoplankton to benefit from a warmer climate and the fraction of cyanobacteria to increase. In the 6 • C warming scenario, a nutrient load reduction of as much as 60% would be required to achieve summer chlorophyll-a levels similar to those of the baseline scenario with present-day temperatures.

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Section: Model Calibration and Performancecontrasting

confidence: 68%

Climate Change Will Make Recovery from Eutrophication More Difficult in Shallow Danish Lake Søbygaard

Rolighed

Søndergaard

Bjerring

et al. 2016

Water

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“…Also, we know from on site inspection that P enriched organic sediments rarely exist in the river and channel sections. According to Jensen et al (1992b) and Seitzinger (1988) nitrogen losses are mainly caused by two processes: denitrification and sedimentation. Both, nitrate reduction (Chapra, 1997) and settling of particulate N (Scheffer, 1998) can be described by first order kinetics.…”

Section: Quantification Of Nutrient Retentionmentioning

confidence: 99%

“…That is, the concentrations' rate of change depends linearily on the respective concentrations. Since Jensen et al (1992b) found denitrification in lakes to be closer related to the concentration of TN rather than to NO − 3 , a lumped first order term was tested for the description of total nitrogen retention (Eq. 2).…”

Section: Quantification Of Nutrient Retentionmentioning

confidence: 99%

Analysis and simulation of nutrient retention and management for a lowland river-lake system

Kneis

Knoesche

Bronstert

2006

Hydrol. Earth Syst. Sci.

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Abstract. In the context of the European Water Framework Directive, we studied the possible impact of reduced emissions on phosphorus and nitrogen concentrations in a lowland river-lake system (Havel River, Germany). As a prerequisite, we quantified the retention of nutrients in the river from mass balances and deduced its seasonal variation. We detected that about 30% of the total nitrogen input is retained within the surveyed river section. In contrast, phosphorus release from sediments was shown to cause a considerable increase in present P concentrations. Average net phosphorus release rates of about 20 mg P m −2 d −1 in late summer were estimated for the Havel Lakes. Based on the observed patterns of N retention and P release we parametrized a newly developed water quality simulation program (TRAM), which allows alternative model approaches of different complexity to be implemented and tested. To account for the future trend of internal P loading, the phosphorus excess in lake sediments was estimated from core samples and included in the model as a state variable. For analyzing scenarios of reduced nutrient emissisions, the water quality simulation program was linked to mesoscale hydrological catchment models for the first time. From scenario simulations we conclude that internal P loading is likely to counteract efforts of emission control for decades. Even by significant reductions in external P loads, a persistent phosphorus limitation of primary production can hardly be established in the analyzed time frame of 13 years. Though in the short run a continued reduction in nitrogen loads appears to be the more promising approach of eutrophication management, we recommend enhanced efforts to diminish both N and P emissions.

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“…Furthermore, a BMR nutrient budget for year 2008 [17], reported that over 60 % and 30% of nitrate and nitrite respectively that entered the reservoir were retained and permanently buried in the sediment, while the rest are estimated to be removed via denitrification. In Denmark, Jensen et al [18] found that nitrogen retention was indeed IConCEES 2015 05004-p.5 caused by denitrification. Akinbile et al [19] also did a study on addition to the analysis of phosphorus and nitrogen contents of the sediment in BMR and found out that the water was slightly polluted (Class III according to Malaysia Water Quality Index) at the highest concentration of nitrogen and phosphorus.…”

Section: -P4mentioning

confidence: 99%

Nutrient Concentration Distribution in Sediment and Overlying Water at Bukit Merah Reservoir, Perak

Talib

Yusoff

Hasan

et al. 2016

MATEC Web of Conferences

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Abstract. Bukit Merah Reservoir (BMR) is the oldest reservoir in Malaysia constructed to supply irrigation water to the Kerian Irrigation Scheme. Depletion of storage capacity due to sedimentation process is the most concerning issue of the reservoir recently. Sediment analysis is also very important when monitoring the substances that appear in the reservoir water. Environmental toxins, like heavy metals and hydrophobic organic components, as well as nutrients such as nitrogen and phosphorus are readily bond to the particulate matter. Factors in the reservoir that affect the particulate matter will aid the distribution of contaminants in the sediments. The contaminants in the sediments could have higher concentrations compared to those found in the overlying water. This means that the sediment plays an important role in the cycling of nutrients and distribution of contaminants in the ecosystem. The objectives of this research are to determine the relationship of nutrient and heavy metal content for sediment and overlying water. Nutrient profile information is provided from sediment sample analysis. Based on the data from the horizontal distribution of surface sediment phosphorus in BMR, it was apparent that the highest concentration occurred in the reservoir inlet from Sungai Kurau catchment area. Phosphorus and nitrogen in BMR have a similar trend of decreasing concentration from upstream to downstream. The phosphorus and nitrogen concentrations of surface sediment were in fact significantly correlated with phosphorus and nitrogen concentrations of surface water because of the high value of determination of correlation (R 2 ). As a conclusion, the deposition of sediments was found to bring along external nutrients. Variability of phosphorus and nitrogen concentrations in the sediment directly affects the quality of water which is very important for irrigation and domestic uses.

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Nitrogen Loss and Denitrification as Studied in Relation to Reductions in Nitrogen Loading in a Shallow, Hypertrophic Lake (Lake Søbygård, Denmark)

Cited by 61 publications

References 27 publications

Climate Change Will Make Recovery from Eutrophication More Difficult in Shallow Danish Lake Søbygaard

Climate Change Will Make Recovery from Eutrophication More Difficult in Shallow Danish Lake Søbygaard

Analysis and simulation of nutrient retention and management for a lowland river-lake system

Nutrient Concentration Distribution in Sediment and Overlying Water at Bukit Merah Reservoir, Perak

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