Effects of policy measures implemented in Denmark on nitrogen pollution of the aquatic environment

Kronvang, Brian; Andersen, Hans Estrup; Børgesen, Christen Duus; Dalgaard, Tommy; Larsen, Søren E.; Bøgestrand, Jens; Blicher-Mathiasen, Gitte

doi:10.1016/j.envsci.2007.10.007

Cited by 201 publications

(142 citation statements)

References 9 publications

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“…In addition, more recent regional reductions seen in nutrient exports [e.g., total landbased N load to Danish coastal waters has been reduced by ca. 50 % since 1990 (Kronvang et al 2008)] may not be adequately reflected by adopting a calibration window from 1970 to 2000 (these impacts, however, are quantified under the validation period in Tables 1, 2).…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

Future Nutrient Load Scenarios for the Baltic Sea Due to Climate and Lifestyle Changes

Hägg

Lyon

Wällstedt

et al. 2013

AMBIO

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Dynamic model simulations of the future climate and projections of future lifestyles within the Baltic Sea Drainage Basin (BSDB) were considered in this study to estimate potential trends in future nutrient loads to the Baltic Sea. Total nitrogen and total phosphorus loads were estimated using a simple proxy based only on human population (to account for nutrient sources) and stream discharges (to account for nutrient transport). This population-discharge proxy provided a good estimate for nutrient loads across the seven sub-basins of the BSDB considered. All climate scenarios considered here produced increased nutrient loads to the Baltic Sea over the next 100 years. There was variation between the climate scenarios such that sub-basin and regional differences were seen in future nutrient runoff depending on the climate model and scenario considered. Regardless, the results of this study indicate that changes in lifestyle brought about through shifts in consumption and population potentially overshadow the climate effects on future nutrient runoff for the entire BSDB. Regionally, however, lifestyle changes appear relatively more important in the southern regions of the BSDB while climatic changes appear more important in the northern regions with regards to future increases in nutrient loads. From a whole-ecosystem management perspective of the BSDB, this implies that implementation of improved and targeted management practices can still bring about improved conditions in the Baltic Sea in the face of a warmer and wetter future climate.

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Section: Discussion and Concluding Remarksmentioning

confidence: 99%

Future Nutrient Load Scenarios for the Baltic Sea Due to Climate and Lifestyle Changes

Hägg

Lyon

Wällstedt

et al. 2013

AMBIO

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“…5) regarding nutrient losses to aquatic systems adversely impacting reservoir water quality. Based on watershed models as that applied in the present study, such tools may also allow spatial differentiation of crop-specific fertilizer norms, which is common in several Western countries (Kronvang et al 2008). Awareness of spatial vulnerability may improve the layout and selection of areas for implementation of measures such as ditches and wetlands (Jiang et al 2007) that locally lower agricultural non-point source nutrient exports -as called for by Tang et al (2012).…”

Section: Lessons Learnt and The Way Forwardmentioning

confidence: 99%

Assessing ways to combat eutrophication in a Chinese drinking water reservoir using SWAT

Nielsen

Trolle

et al. 2013

Mar. Freshwater Res.

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Abstract. Across China, nutrient losses associated with agricultural production and domestic sewage have triggered eutrophication, and local managers are challenged to comply with drinking water quality requirements. Evidently, the improvement of water quality should be targeted holistically and encompass both point sources and surface activities within the watershed of a reservoir. We expanded the ordinary Soil Water Assessment Tool -(SWAT) with a widely used empirical equation to estimate total phosphorus (TP) concentrations in lakes and reservoirs. Subsequently, we examined the effects of changes in land and livestock management and sewage treatment on nutrient export and derived consequences for water quality in the Chinese subtropical Kaiping (Dashahe) drinking water reservoir (supplying 0.4 million people). The critical load of TP was estimated to 13.5 tonnes yr À1 in order to comply with the minimum drinking water requirements, which corresponds to 87% of the simulated load to the reservoir at present. Both the implementation of buffer zones along rivers and removal of sewage discharges showed marked improvement in reservoir water quality. Future research should focus on both hydrological model performance and nutrient transport pathways, which are challenged by a complex artificially altered water infrastructure in the form of ditches, channels and ponds in monsooninfluenced subtropical watersheds.

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“…In Denmark, agriculture accounted for approximately 81% of the N load to Danish watercourses and about 70% of the N inputs to the sea via water courses and atmospheric deposition during 1989-1996(Hansen et al, 2000a. However, the nitrate leaching from agriculture in Denmark has been substantially reduced through governmental regulations setting standards for rates of manure and fertilizer application, use of catch crops (Kronvang et al, 2008) and encouraging additional measures such as organic farming (Askegaard et al, 2005). However, despite the decrease in N concentrations observed in surface water (Jeppesen et al, 2011) further reductions in N leaching are needed to achieve the goals of good ecological status of the aquatic environment as required by the EU Water Framework Directive.…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature and precipitation on nitrate leaching from organic cereal cropping systems in Denmark

Jabloun

Schelde

Tao

et al. 2015

European Journal of Agronomy

112

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a b s t r a c tThe effect of variation in seasonal temperature and precipitation on soil water nitrate (NO 3 N) concentration and leaching from winter and spring cereals cropping systems was investigated over three consecutive four-year crop rotation cycles from 1997 to 2008 in an organic farming crop rotation experiment in Denmark. Three experimental sites, varying in climate and soil type from coarse sand to sandy loam, were investigated. The experiment included experimental treatments with different rotations, manure rate and cover crop, and soil nitrate concentrations was monitored using suction cups. The effects of climate, soil and management were examined in a linear mixed model, and only parameters with significant effect (P < 0.05) were included in the final model. The model explained 61% and 47% of the variation in the square root transform of flow-weighted annual NO 3 N concentration for winter and spring cereals, respectively, and 68% and 77% of the variation in the square root transform of annual NO 3 N leaching for winter and spring cereals, respectively. Nitrate concentration and leaching were shown to be site specific and driven by climatic factors and crop management. There were significant effects on annual N concentration and NO 3 N leaching of location, rotation, previous crop and crop cover during autumn and winter. The relative effects of temperature and precipitation differed between seasons and cropping systems. A sensitivity analysis revealed that the predicted N concentration and leaching increased with increases in temperature and precipitation.

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Effects of policy measures implemented in Denmark on nitrogen pollution of the aquatic environment

Cited by 201 publications

References 9 publications

Future Nutrient Load Scenarios for the Baltic Sea Due to Climate and Lifestyle Changes

Future Nutrient Load Scenarios for the Baltic Sea Due to Climate and Lifestyle Changes

Assessing ways to combat eutrophication in a Chinese drinking water reservoir using SWAT

Effect of temperature and precipitation on nitrate leaching from organic cereal cropping systems in Denmark

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