ABSTRACT The overall aim of performing nitrate trend analyses in oxic groundwater is to document ... more ABSTRACT The overall aim of performing nitrate trend analyses in oxic groundwater is to document the effect of regulation of Danish agriculture on N pollution. The design of the Danish Groundwater Monitoring Programme is presented and discussed in relation to performance of statistical consistence nitrate trend analyses. Three types of data are crucial. Firstly, long and continuous time-series from the national groundwater monitoring network enable a statistically systematic analysis of distribution, trends and trend reversals in the groundwater nitrate concentration. Secondly, knowledge about the N surplus in Danish agriculture since 1950 from Denmark Statistics is used as an indicator of the potential loss of N. Thirdly, groundwater recharge age determination are performed in order to allow linking of the first two dataset. Recent results published in Hansen et al. (2011 & 2012) will be presented. Since the 1980s, regulations implemented by Danish farmers have succeeded in optimizing the N (nitrogen) management at farm level. As a result, the upward agricultural N surplus trend has been reversed, and the N surplus has reduced by 30-55% from 1980 to 2007 depending on region. The reduction in the N surplus served to reduce the losses of N from agriculture, with documented positive effects on nature and the environment in Denmark. In groundwater, the upward trend in nitrate concentrations was reversed around 1980, and a larger number of downward nitrate trends were seen in the youngest groundwater compared with the oldest groundwater. However, on average, approximately 48% of the oxic monitored groundwater has nitrate concentrations above the groundwater and drinking water standards of 50 mg/l. Furthermore, trend analyses show that 33% of all the monitored groundwater has upward nitrate trends, while only 18% of the youngest groundwater has upward nitrate trends according to data sampled from 1988-2009. A regional analysis shows a correlation between a high level of N surplus in agriculture, high concentrations of nitrate in groundwater and the largest number of downward nitrate trends in groundwater in the livestock-dense northern and western parts of Denmark compared with the south-eastern regions with lower livestock densities. These results indicate that the livestock farms dominating in northern and western parts of Denmark have achieved the largest reductions in N surpluses. Hansen, B., Thorling, L., Dalgaard, T. & Erlandsen, M., 2011. Trend Reversal of Nitrate in Danish groundwater - a Reflection of Agricultural Practices and Nitrogen Surpluses since 1950. Environmental Science & Technology, 45 (1), 228-234. Hansen, B., Dalgaard, T., Thorling, L., Sørensen, B. & Erlandsen, M., 2012. Regional analysis of groundwater nitrate concentrations and trends in Denmark in regard to agricultural influence. Biogeosciences, 9, 3277-3286.
Zeitschrift für Geomorphologie, Supplementary Issues, 2010
Abstract. Soil-water erosion is a major cause of landscape degradation in Mediterranean karst en-... more Abstract. Soil-water erosion is a major cause of landscape degradation in Mediterranean karst en-vironments, including Lebanon. This paper proposes visual erosion features (ie exposed roots, earth pillars, soil drift and etching, linear channels) that can be used as proofs of the ...
ABSTRACT With more than 60% of the land farmed, with vulnerable freshwater and marine environment... more ABSTRACT With more than 60% of the land farmed, with vulnerable freshwater and marine environments, and with one of the most intensive, export-oriented livestock sectors in the world, the nitrogen (N) pollution pressure from Danish agriculture is severe. Consequently, a series of policy action plans have been implemented since the mid 1980s with significant effects on the surplus, efficiency and environmental loadings of N. This paper reviews the policies and actions taken and their ability to mitigate effects of reactive N (Nr) while maintaining agricultural production. In summary, the average N-surplus has been reduced from approximately 170 kg N ha−1 yr−1 to below 100 kg N ha−1 yr−1 during the past 30 yrs, while the overall N-efficiency for the agricultural sector (crop + livestock farming) has increased from around 20–30% to 40–45%, the N-leaching from the field root zone has been halved, and N losses to the aquatic and atmospheric environment have been significantly reduced. This has been achieved through a combination of approaches and measures (ranging from command and control legislation, over market-based regulation and governmental expenditure to information and voluntary action), with specific measures addressing the whole N cascade, in order to improve the quality of ground- and surface waters, and to reduce the deposition to terrestrial natural ecosystems. However, there is still a major challenge in complying with the EU Water Framework and Habitats Directives, calling for new approaches, measures and technologies to mitigate agricultural N losses and control N flows.
... 1 Det Jordbrugsvidenskabelige Fakultet Institut for Jordbrugsproduktion og Miljø 2 Danmarks M... more ... 1 Det Jordbrugsvidenskabelige Fakultet Institut for Jordbrugsproduktion og Miljø 2 Danmarks Miljøundersøgelser Institut for Ferskvandsøkologi tommy.dalgaard@agrsci.dk ... Imidlertid sker de største absolutte tab på husdyrbrug, og en optimering af samspillet mel-lem husdyr-og ...
ABSTRACT The overall aim of performing nitrate trend analyses in oxic groundwater is to document ... more ABSTRACT The overall aim of performing nitrate trend analyses in oxic groundwater is to document the effect of regulation of Danish agriculture on N pollution. The design of the Danish Groundwater Monitoring Programme is presented and discussed in relation to performance of statistical consistence nitrate trend analyses. Three types of data are crucial. Firstly, long and continuous time-series from the national groundwater monitoring network enable a statistically systematic analysis of distribution, trends and trend reversals in the groundwater nitrate concentration. Secondly, knowledge about the N surplus in Danish agriculture since 1950 from Denmark Statistics is used as an indicator of the potential loss of N. Thirdly, groundwater recharge age determination are performed in order to allow linking of the first two dataset. Recent results published in Hansen et al. (2011 & 2012) will be presented. Since the 1980s, regulations implemented by Danish farmers have succeeded in optimizing the N (nitrogen) management at farm level. As a result, the upward agricultural N surplus trend has been reversed, and the N surplus has reduced by 30-55% from 1980 to 2007 depending on region. The reduction in the N surplus served to reduce the losses of N from agriculture, with documented positive effects on nature and the environment in Denmark. In groundwater, the upward trend in nitrate concentrations was reversed around 1980, and a larger number of downward nitrate trends were seen in the youngest groundwater compared with the oldest groundwater. However, on average, approximately 48% of the oxic monitored groundwater has nitrate concentrations above the groundwater and drinking water standards of 50 mg/l. Furthermore, trend analyses show that 33% of all the monitored groundwater has upward nitrate trends, while only 18% of the youngest groundwater has upward nitrate trends according to data sampled from 1988-2009. A regional analysis shows a correlation between a high level of N surplus in agriculture, high concentrations of nitrate in groundwater and the largest number of downward nitrate trends in groundwater in the livestock-dense northern and western parts of Denmark compared with the south-eastern regions with lower livestock densities. These results indicate that the livestock farms dominating in northern and western parts of Denmark have achieved the largest reductions in N surpluses. Hansen, B., Thorling, L., Dalgaard, T. & Erlandsen, M., 2011. Trend Reversal of Nitrate in Danish groundwater - a Reflection of Agricultural Practices and Nitrogen Surpluses since 1950. Environmental Science & Technology, 45 (1), 228-234. Hansen, B., Dalgaard, T., Thorling, L., Sørensen, B. & Erlandsen, M., 2012. Regional analysis of groundwater nitrate concentrations and trends in Denmark in regard to agricultural influence. Biogeosciences, 9, 3277-3286.
Zeitschrift für Geomorphologie, Supplementary Issues, 2010
Abstract. Soil-water erosion is a major cause of landscape degradation in Mediterranean karst en-... more Abstract. Soil-water erosion is a major cause of landscape degradation in Mediterranean karst en-vironments, including Lebanon. This paper proposes visual erosion features (ie exposed roots, earth pillars, soil drift and etching, linear channels) that can be used as proofs of the ...
ABSTRACT With more than 60% of the land farmed, with vulnerable freshwater and marine environment... more ABSTRACT With more than 60% of the land farmed, with vulnerable freshwater and marine environments, and with one of the most intensive, export-oriented livestock sectors in the world, the nitrogen (N) pollution pressure from Danish agriculture is severe. Consequently, a series of policy action plans have been implemented since the mid 1980s with significant effects on the surplus, efficiency and environmental loadings of N. This paper reviews the policies and actions taken and their ability to mitigate effects of reactive N (Nr) while maintaining agricultural production. In summary, the average N-surplus has been reduced from approximately 170 kg N ha−1 yr−1 to below 100 kg N ha−1 yr−1 during the past 30 yrs, while the overall N-efficiency for the agricultural sector (crop + livestock farming) has increased from around 20–30% to 40–45%, the N-leaching from the field root zone has been halved, and N losses to the aquatic and atmospheric environment have been significantly reduced. This has been achieved through a combination of approaches and measures (ranging from command and control legislation, over market-based regulation and governmental expenditure to information and voluntary action), with specific measures addressing the whole N cascade, in order to improve the quality of ground- and surface waters, and to reduce the deposition to terrestrial natural ecosystems. However, there is still a major challenge in complying with the EU Water Framework and Habitats Directives, calling for new approaches, measures and technologies to mitigate agricultural N losses and control N flows.
... 1 Det Jordbrugsvidenskabelige Fakultet Institut for Jordbrugsproduktion og Miljø 2 Danmarks M... more ... 1 Det Jordbrugsvidenskabelige Fakultet Institut for Jordbrugsproduktion og Miljø 2 Danmarks Miljøundersøgelser Institut for Ferskvandsøkologi tommy.dalgaard@agrsci.dk ... Imidlertid sker de største absolutte tab på husdyrbrug, og en optimering af samspillet mel-lem husdyr-og ...
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