A publication developed within Work Package 5 of the EUROHARP project: "Application of methodolog... more A publication developed within Work Package 5 of the EUROHARP project: "Application of methodologies to analyse nutrient pollution in a European River Basin Network".
The EC funded EUROHARP project encompasses 22 research institutes from 17 European countries (200... more The EC funded EUROHARP project encompasses 22 research institutes from 17 European countries (2002-2005). The overall objective of the EUROHARP work is to provide end-users with guidance for an appropriate choice of quantification tools to satisfy existing European requirements on harmonisation and transparency for quantifying diffuse nutrient losses, e.g. to facilitate the implementation of the Water Framework Directive and the Nitrates Directive. The project includes both the assessment of the performance of individual models and the applicability of the same models in catchments throughout Europe with different data availability and environmental condition. The basis for the performance and applicability studies is the compilation of a harmonised GIS/database for all catchment data and the analysis of these data (trends, watercourse retention).E
Årsliste 2005The EC funded EUROHARP project encompasses 22 research institutes from 17 European c... more Årsliste 2005The EC funded EUROHARP project encompasses 22 research institutes from 17 European countries (2002-2005). The overall objective of the EUROHARP work is to provide end-users with guidance for an appropriate choice of quantification tools to satisfy existing European requirements on harmonisation and transparency for quantifying diffuse nutrient losses, e.g. to facilitate the implementation of the Water Framework Directive and the Nitrates Directive. The project includes both the assessment of the performance of individual models and the applicability of the same models in catchments with different data availability and environmental condition throughout Europe. The basis for the performance and applicability studies is the compilation of a harmonised GIS/database for all catchment data and the analysis of these data (trends, watercourse retention)
Twenty-nine Danish streams were investigated in September 1998. The streams drained catchments of... more Twenty-nine Danish streams were investigated in September 1998. The streams drained catchments of varying hydrology, topography, soil type and land use. In each stream, the newly accumulated streambed sediment was sampled and subsequently analysed for pesticides. In each stream, five replicate macroinvertebrate samples were taken in the same sediments as the pesticide samples. In addition, five samples were taken in riffles to provide a complete picture of macroinvertebrate community composition. The number of detected pesticides reflected soil type and land use: in agricultural catchments on clay soils the average number of pesticides were 4.3±2.2; on sandy soils 2.6±1.0, while only 1.5±0.6 pesticides were found in streams without agricultural activities. The macroinvertebrate composition showed clear changes along this gradient of sediment pesticide concentrations. The number of the amphipod Gammarus pulex was negatively correlated with sediment pesticide concentration, while the number of Oligochaeta and Hirudinae was positively correlated. The findings indicate that pesticides have a potential to structure macroinvertebrate communities in Danish streams. However, agricultural impact is more than pesticides, and several other factors, such as channelisation, affect the macroinvertebrate community and these are not easily separated.
Årsliste 2005The EC funded EUROHARP project encompasses 22 research institutes from 17 European c... more Årsliste 2005The EC funded EUROHARP project encompasses 22 research institutes from 17 European countries (2002-2005). The overall objective of the EUROHARP work is to provide end-users with guidance for an appropriate choice of quantification tools to satisfy existing European requirements on harmonisation and transparency for quantifying diffuse nutrient losses, e.g. to facilitate the implementation of the Water Framework Directive and the Nitrates Directive. The project includes both the assessment of the performance of individual models and the applicability of the same models in catchments throughout Europe with different data availability and environmental condition. The basis for the performance and applicability studies is the compilation of a harmonised GIS/database for all catchment data and the analysis of these data (trends, watercourse retention).E
Årsliste 2005The EC funded EUROHARP project encompasses 22 research institutes from17 European co... more Årsliste 2005The EC funded EUROHARP project encompasses 22 research institutes from17 European countries (2002-2005). The overall objective of the EUROHARPwork is to provide end-users with guidance for an appropriate choice ofquantification tools to satisfy existing European requirements on harmonisationand transparency for quantifying diffuse nutrient losses, e.g. to facilitate theimplementation of the Water Framework Directive and the Nitrates Directive.The project includes both the assessment of the performance of individualmodels and the applicability of the same models in catchments throughoutEurope with different data availability and environmental condition. The basisfor the performance and applicability studies is the compilation of a harmonisedGIS/database for all catchment data and the analysis of these data (trends,watercourse retention)
Årsliste 2005The EC funded EUROHARP project encompasses 22 research institutes from17 European co... more Årsliste 2005The EC funded EUROHARP project encompasses 22 research institutes from17 European countries (2002-2005). The overall objective of the EUROHARPwork is to provide end-users with guidance for an appropriate choice ofquantification tools to satisfy existing European requirements on harmonisationand transparency for quantifying diffuse nutrient losses, e.g. to facilitate theimplementation of the Water Framework Directive and the Nitrates Directive.The project includes both the assessment of the performance of individualmodels and the applicability of the same models in catchments throughoutEurope with different data availability and environmental condition. The basisfor the performance and applicability studies is the compilation of a harmonisedGIS/database for all catchment data and the analysis of these data (trends,watercourse retention)
Årsliste 2005The EC funded EUROHARP project encompasses 22 research institutes from 17 European c... more Årsliste 2005The EC funded EUROHARP project encompasses 22 research institutes from 17 European countries (2002-2005). The overall objective of the EUROHARPwork is to provide end-users with guidance for an appropriate choice ofquantification tools to satisfy existing European requirements on harmonisationand transparency for quantifying diffuse nutrient losses, e.g. to facilitate theimplementation of the Water Framework Directive and the Nitrates Directive.The project includes both the assessment of the performance of individualmodels and the applicability of the same models in catchments throughoutEurope with different data availability and environmental condition. The basisfor the performance and applicability studies is the compilation of a harmonisedGIS/database for all catchment data and the analysis of these data (trends,watercourse retention)
Arsliste 2005 The report may also be downloaded from the EUROHARP web site: www.euroharp.org. Aut... more Arsliste 2005 The report may also be downloaded from the EUROHARP web site: www.euroharp.org. Authours and NIVA assume no liability for any loss resulting from the use of the results of this report.
Nitrogen lost from agriculture has altered the geochemistry of the biosphere, with pronounced imp... more Nitrogen lost from agriculture has altered the geochemistry of the biosphere, with pronounced impacts on aquatic ecosystems. We aim to elucidate the patterns and driving factors behind the N fluxes in lowland stream ecosystems differing about land-use and climatic-hydrological conditions. The climate-hydrology areas represented humid cold temperate/stable discharge conditions, and humid subtropical climate/flashy conditions. Three complementary monitoring sampling characteristics were selected, including a total of 43 streams under contrasting farming intensities. Farming intensity determined total dissolved N (TDN), nitrate concentrations, and total N concentration and loss to streams, despite differences in soil and climatic-hydrological conditions between and within regions. However, ammonium (NH4+) and dissolved organic N concentrations did not show significant responses to the farming intensity or climatic/hydrological conditions. A high dissolved inorganic N to TDN ratio was a...
Monitoring of agricultural mini-catchments (AMC) has been part of the Danish national monitoring ... more Monitoring of agricultural mini-catchments (AMC) has been part of the Danish national monitoring programme (National Monitoring Programme for Water and Nature) since 1989. Thus, nitrogen (N) concentrations and loads have been monitored in soil water, tile drains, and streams within five AMC. Moreover, extensive monitoring of N concentrations and loads in streams draining 46 mini-catchments has been conducted every year since 1989. This has resulted in two national datasets on trends in flow-weighted N concentrations relative to factors such as groundwater age and management history. We analyzed these datasets and found that the intensively monitored micro-catchments generally showed a strong signal with significant downward trends in flow-weighted N concentrations in monitored soil water (−22% to −68%), tile drains (−38% to −59%), and streams (−19% to −53%). The 46 micro-catchments monitored for N in streams also exhibited downward trends in flow-weighted N concentrations, which can...
A publication developed within Work Package 5 of the EUROHARP project: "Application of methodolog... more A publication developed within Work Package 5 of the EUROHARP project: "Application of methodologies to analyse nutrient pollution in a European River Basin Network".
The EC funded EUROHARP project encompasses 22 research institutes from 17 European countries (200... more The EC funded EUROHARP project encompasses 22 research institutes from 17 European countries (2002-2005). The overall objective of the EUROHARP work is to provide end-users with guidance for an appropriate choice of quantification tools to satisfy existing European requirements on harmonisation and transparency for quantifying diffuse nutrient losses, e.g. to facilitate the implementation of the Water Framework Directive and the Nitrates Directive. The project includes both the assessment of the performance of individual models and the applicability of the same models in catchments throughout Europe with different data availability and environmental condition. The basis for the performance and applicability studies is the compilation of a harmonised GIS/database for all catchment data and the analysis of these data (trends, watercourse retention).E
Årsliste 2005The EC funded EUROHARP project encompasses 22 research institutes from 17 European c... more Årsliste 2005The EC funded EUROHARP project encompasses 22 research institutes from 17 European countries (2002-2005). The overall objective of the EUROHARP work is to provide end-users with guidance for an appropriate choice of quantification tools to satisfy existing European requirements on harmonisation and transparency for quantifying diffuse nutrient losses, e.g. to facilitate the implementation of the Water Framework Directive and the Nitrates Directive. The project includes both the assessment of the performance of individual models and the applicability of the same models in catchments with different data availability and environmental condition throughout Europe. The basis for the performance and applicability studies is the compilation of a harmonised GIS/database for all catchment data and the analysis of these data (trends, watercourse retention)
Twenty-nine Danish streams were investigated in September 1998. The streams drained catchments of... more Twenty-nine Danish streams were investigated in September 1998. The streams drained catchments of varying hydrology, topography, soil type and land use. In each stream, the newly accumulated streambed sediment was sampled and subsequently analysed for pesticides. In each stream, five replicate macroinvertebrate samples were taken in the same sediments as the pesticide samples. In addition, five samples were taken in riffles to provide a complete picture of macroinvertebrate community composition. The number of detected pesticides reflected soil type and land use: in agricultural catchments on clay soils the average number of pesticides were 4.3±2.2; on sandy soils 2.6±1.0, while only 1.5±0.6 pesticides were found in streams without agricultural activities. The macroinvertebrate composition showed clear changes along this gradient of sediment pesticide concentrations. The number of the amphipod Gammarus pulex was negatively correlated with sediment pesticide concentration, while the number of Oligochaeta and Hirudinae was positively correlated. The findings indicate that pesticides have a potential to structure macroinvertebrate communities in Danish streams. However, agricultural impact is more than pesticides, and several other factors, such as channelisation, affect the macroinvertebrate community and these are not easily separated.
Årsliste 2005The EC funded EUROHARP project encompasses 22 research institutes from 17 European c... more Årsliste 2005The EC funded EUROHARP project encompasses 22 research institutes from 17 European countries (2002-2005). The overall objective of the EUROHARP work is to provide end-users with guidance for an appropriate choice of quantification tools to satisfy existing European requirements on harmonisation and transparency for quantifying diffuse nutrient losses, e.g. to facilitate the implementation of the Water Framework Directive and the Nitrates Directive. The project includes both the assessment of the performance of individual models and the applicability of the same models in catchments throughout Europe with different data availability and environmental condition. The basis for the performance and applicability studies is the compilation of a harmonised GIS/database for all catchment data and the analysis of these data (trends, watercourse retention).E
Årsliste 2005The EC funded EUROHARP project encompasses 22 research institutes from17 European co... more Årsliste 2005The EC funded EUROHARP project encompasses 22 research institutes from17 European countries (2002-2005). The overall objective of the EUROHARPwork is to provide end-users with guidance for an appropriate choice ofquantification tools to satisfy existing European requirements on harmonisationand transparency for quantifying diffuse nutrient losses, e.g. to facilitate theimplementation of the Water Framework Directive and the Nitrates Directive.The project includes both the assessment of the performance of individualmodels and the applicability of the same models in catchments throughoutEurope with different data availability and environmental condition. The basisfor the performance and applicability studies is the compilation of a harmonisedGIS/database for all catchment data and the analysis of these data (trends,watercourse retention)
Årsliste 2005The EC funded EUROHARP project encompasses 22 research institutes from17 European co... more Årsliste 2005The EC funded EUROHARP project encompasses 22 research institutes from17 European countries (2002-2005). The overall objective of the EUROHARPwork is to provide end-users with guidance for an appropriate choice ofquantification tools to satisfy existing European requirements on harmonisationand transparency for quantifying diffuse nutrient losses, e.g. to facilitate theimplementation of the Water Framework Directive and the Nitrates Directive.The project includes both the assessment of the performance of individualmodels and the applicability of the same models in catchments throughoutEurope with different data availability and environmental condition. The basisfor the performance and applicability studies is the compilation of a harmonisedGIS/database for all catchment data and the analysis of these data (trends,watercourse retention)
Årsliste 2005The EC funded EUROHARP project encompasses 22 research institutes from 17 European c... more Årsliste 2005The EC funded EUROHARP project encompasses 22 research institutes from 17 European countries (2002-2005). The overall objective of the EUROHARPwork is to provide end-users with guidance for an appropriate choice ofquantification tools to satisfy existing European requirements on harmonisationand transparency for quantifying diffuse nutrient losses, e.g. to facilitate theimplementation of the Water Framework Directive and the Nitrates Directive.The project includes both the assessment of the performance of individualmodels and the applicability of the same models in catchments throughoutEurope with different data availability and environmental condition. The basisfor the performance and applicability studies is the compilation of a harmonisedGIS/database for all catchment data and the analysis of these data (trends,watercourse retention)
Arsliste 2005 The report may also be downloaded from the EUROHARP web site: www.euroharp.org. Aut... more Arsliste 2005 The report may also be downloaded from the EUROHARP web site: www.euroharp.org. Authours and NIVA assume no liability for any loss resulting from the use of the results of this report.
Nitrogen lost from agriculture has altered the geochemistry of the biosphere, with pronounced imp... more Nitrogen lost from agriculture has altered the geochemistry of the biosphere, with pronounced impacts on aquatic ecosystems. We aim to elucidate the patterns and driving factors behind the N fluxes in lowland stream ecosystems differing about land-use and climatic-hydrological conditions. The climate-hydrology areas represented humid cold temperate/stable discharge conditions, and humid subtropical climate/flashy conditions. Three complementary monitoring sampling characteristics were selected, including a total of 43 streams under contrasting farming intensities. Farming intensity determined total dissolved N (TDN), nitrate concentrations, and total N concentration and loss to streams, despite differences in soil and climatic-hydrological conditions between and within regions. However, ammonium (NH4+) and dissolved organic N concentrations did not show significant responses to the farming intensity or climatic/hydrological conditions. A high dissolved inorganic N to TDN ratio was a...
Monitoring of agricultural mini-catchments (AMC) has been part of the Danish national monitoring ... more Monitoring of agricultural mini-catchments (AMC) has been part of the Danish national monitoring programme (National Monitoring Programme for Water and Nature) since 1989. Thus, nitrogen (N) concentrations and loads have been monitored in soil water, tile drains, and streams within five AMC. Moreover, extensive monitoring of N concentrations and loads in streams draining 46 mini-catchments has been conducted every year since 1989. This has resulted in two national datasets on trends in flow-weighted N concentrations relative to factors such as groundwater age and management history. We analyzed these datasets and found that the intensively monitored micro-catchments generally showed a strong signal with significant downward trends in flow-weighted N concentrations in monitored soil water (−22% to −68%), tile drains (−38% to −59%), and streams (−19% to −53%). The 46 micro-catchments monitored for N in streams also exhibited downward trends in flow-weighted N concentrations, which can...
Uploads
Papers by Brian Kronvang