Suchergebnisse

Vol. 5-8, 1st-4th supplement--cf. Harvard Law school library catalog. ; Imprint varies: v. 6-7, Ward & Peloubet. ; Binder's title: National digest. ; Mode of access: Internet.

Human alteration of nutrient cycles has caused persistent and widespread degradation of water quality around the globe. In many regions, including Western Europe, elevated nitrate (NO3−) concentration in surface waters contributes to eutrophication and noncompliance with environmental legislation. Discharge, NO3− concentrations and the vulnerability of the aquatic ecosystems to eutrophication often exhibit a distinct seasonality. Understanding spatial patterns and long‐term trends in this seasonality is crucial to improve water quality management. Here, we hypothesized that NO3− concentrations during high‐flow periods would respond faster to changes in nutrient inputs than low‐flow concentrations because of greater connectivity of shallow diffuse NO3− sources with the river network. To test this hypothesis, we compiled long‐term NO3− and discharge time series from 290 Western European catchments. To characterize the long‐term trajectories of seasonal NO3− concentration, we propose a novel hysteresis approach comparing low‐ and high‐flow NO3− concentration in the context of multi‐decadal N input changes. We found synchronous winter maxima of NO3− and discharge in 84% of the study catchments. However, contrary to our hypothesis, there were surprisingly diverse long‐term trajectories of seasonal NO3− concentration. Both clockwise (faster high‐flow NO3− response) and counterclockwise hysteresis (faster low‐flow NO3− response) occurred in similar proportions, potentially due to a high complexity in the underlying processes. Spatial variability of seasonality in NO3− concentration across the catchments was more pronounced and better predictable than its long‐term variability. This work demonstrates the value of seasonal and inter‐annual hydrochemical analysis and provides new tools for water quality monitoring and management. ; Plain Language Summary: Nitrogen is an essential element of all living organisms and has thus often been used excessively as fertilizer to secure food production. However, surface waters can suffer from elevated nutrients inputs, causing toxic algal blooms and impairing drinking water quality, especially during summer low flows. To manage water quality, it is crucial to understand these seasonal variations of nitrogen and discharge and the underlying processes. We used data from 290 catchments in France and Germany to characterize average seasonality patterns and their long‐term evolution across the variety of landscapes and human influences. This allowed classifying catchment behavior and linking them to controls. As expected, both nitrogen and discharge peak during winter in most catchments (84%). However, there are well explainable deviations, for example, in mountainous regions. The long‐term evolution of seasonality was more diverse than expected suggesting a complex interplay of various processes with the long input history from fertilization and wastewater being part of the controls. We found that the differences among catchments were greater than the long‐term changes of seasonality within most catchments. By identifying catchment typologies, our study increases the understanding of nitrate seasonality patterns across a large extent and thus supports ecological water quality management. ; Key Points: Spatial patterns of nitrate and discharge seasonality are linked to topography and hydroclimate with winter maxima dominating for both. After decreasing nutrient inputs, cases with decreases in river nitrate preceding during low‐ and high‐flow seasons occurred equally often. Spatial variability of nitrate seasonality is greater and more predictable from catchment characteristics than its long‐term variability. ; Deutsche Forschungsgemeinschaft (DFG) http://dx.doi.org/10.13039/501100001659 ; Helmholtz Association http://dx.doi.org/10.13039/501100009318 ; US National Science Foundation (NSF)

Spine title : Abbott's national digest. ; Mode of access: Internet.

Imprint varies: volumes 3-6, published by Diossy & Company; volume 7, Ward & Peloubet; volume 8, G.S. Diossy. ; Volumes 5-8, title page reads: By Benjamin Vaughan Abbott . Being the first [-fourth] supplement to Abbott's National digest. ; Includes index. ; Volumes 3-4 have subtitle: from the organization of the government to July 1868. ; Mode of access: Internet.

ISI Document Delivery No.: HL0DR Times Cited: 0 Cited Reference Count: 73 Kolbe, Tamara de Dreuzy, Jean-Raynald Abbott, Benjamin W. Aquilina, Luc Babey, Tristan Green, Christopher T. Fleckenstein, Jan H. Labasque, Thierry Laverman, Anniet M. Marcais, Jean Peiffer, Stefan Thomas, Zahra Pinay, Gilles Abbott, Benjamin/0000-0001-5861-3481 European Union's Seventh Framework for research, technological development, and demonstration [607150]; European Union Innovative Training Network "INTERFACES: Ecohydrological interfaces as critical hot spots for transformations of ecosystem exchange fluxes and biogeochemical cycling" Financial support for this research was provided by the European Union's Seventh Framework for research, technological development, and demonstration under Grant 607150. This paper was supported by the European Union Innovative Training Network "INTERFACES: Ecohydrological interfaces as critical hot spots for transformations of ecosystem exchange fluxes and biogeochemical cycling." 0 3 Natl acad sciences Washington ; International audience ; Biogeochemical reactions occur unevenly in space and time, but this heterogeneity is often simplified as a linear average due to sparse data, especially in subsurface environments where access is limited. For example, little is known about the spatial variability of groundwater denitrification, an important process in removing nitrate originating from agriculture and land use conversion. Information about the rate, arrangement, and extent of denitrification is needed to determine sustainable limits of human activity and to predict recovery time frames. Here, we developed and validated a method for inferring the spatial organization of sequential biogeochemical reactions in an aquifer in France. We applied it to five other aquifers in different geological settings located in the United States and compared results among 44 locations across the six aquifers to assess the generality of reactivity trends. Of the sampling locations, 79% showed pronounced increases of ...

ISI Document Delivery No.: HL0DR Times Cited: 0 Cited Reference Count: 73 Kolbe, Tamara de Dreuzy, Jean-Raynald Abbott, Benjamin W. Aquilina, Luc Babey, Tristan Green, Christopher T. Fleckenstein, Jan H. Labasque, Thierry Laverman, Anniet M. Marcais, Jean Peiffer, Stefan Thomas, Zahra Pinay, Gilles Abbott, Benjamin/0000-0001-5861-3481 European Union's Seventh Framework for research, technological development, and demonstration [607150]; European Union Innovative Training Network "INTERFACES: Ecohydrological interfaces as critical hot spots for transformations of ecosystem exchange fluxes and biogeochemical cycling" Financial support for this research was provided by the European Union's Seventh Framework for research, technological development, and demonstration under Grant 607150. This paper was supported by the European Union Innovative Training Network "INTERFACES: Ecohydrological interfaces as critical hot spots for transformations of ecosystem exchange fluxes and biogeochemical cycling." 0 3 Natl acad sciences Washington ; International audience ; Biogeochemical reactions occur unevenly in space and time, but this heterogeneity is often simplified as a linear average due to sparse data, especially in subsurface environments where access is limited. For example, little is known about the spatial variability of groundwater denitrification, an important process in removing nitrate originating from agriculture and land use conversion. Information about the rate, arrangement, and extent of denitrification is needed to determine sustainable limits of human activity and to predict recovery time frames. Here, we developed and validated a method for inferring the spatial organization of sequential biogeochemical reactions in an aquifer in France. We applied it to five other aquifers in different geological settings located in the United States and compared results among 44 locations across the six aquifers to assess the generality of reactivity trends. Of the sampling locations, 79% showed pronounced increases of ...

ISI Document Delivery No.: HL0DR Times Cited: 0 Cited Reference Count: 73 Kolbe, Tamara de Dreuzy, Jean-Raynald Abbott, Benjamin W. Aquilina, Luc Babey, Tristan Green, Christopher T. Fleckenstein, Jan H. Labasque, Thierry Laverman, Anniet M. Marcais, Jean Peiffer, Stefan Thomas, Zahra Pinay, Gilles Abbott, Benjamin/0000-0001-5861-3481 European Union's Seventh Framework for research, technological development, and demonstration [607150]; European Union Innovative Training Network "INTERFACES: Ecohydrological interfaces as critical hot spots for transformations of ecosystem exchange fluxes and biogeochemical cycling" Financial support for this research was provided by the European Union's Seventh Framework for research, technological development, and demonstration under Grant 607150. This paper was supported by the European Union Innovative Training Network "INTERFACES: Ecohydrological interfaces as critical hot spots for transformations of ecosystem exchange fluxes and biogeochemical cycling." 0 3 Natl acad sciences Washington ; International audience ; Biogeochemical reactions occur unevenly in space and time, but this heterogeneity is often simplified as a linear average due to sparse data, especially in subsurface environments where access is limited. For example, little is known about the spatial variability of groundwater denitrification, an important process in removing nitrate originating from agriculture and land use conversion. Information about the rate, arrangement, and extent of denitrification is needed to determine sustainable limits of human activity and to predict recovery time frames. Here, we developed and validated a method for inferring the spatial organization of sequential biogeochemical reactions in an aquifer in France. We applied it to five other aquifers in different geological settings located in the United States and compared results among 44 locations across the six aquifers to assess the generality of reactivity trends. Of the sampling locations, 79% showed pronounced increases of ...

ISI Document Delivery No.: HL0DR Times Cited: 0 Cited Reference Count: 73 Kolbe, Tamara de Dreuzy, Jean-Raynald Abbott, Benjamin W. Aquilina, Luc Babey, Tristan Green, Christopher T. Fleckenstein, Jan H. Labasque, Thierry Laverman, Anniet M. Marcais, Jean Peiffer, Stefan Thomas, Zahra Pinay, Gilles Abbott, Benjamin/0000-0001-5861-3481 European Union's Seventh Framework for research, technological development, and demonstration [607150]; European Union Innovative Training Network "INTERFACES: Ecohydrological interfaces as critical hot spots for transformations of ecosystem exchange fluxes and biogeochemical cycling" Financial support for this research was provided by the European Union's Seventh Framework for research, technological development, and demonstration under Grant 607150. This paper was supported by the European Union Innovative Training Network "INTERFACES: Ecohydrological interfaces as critical hot spots for transformations of ecosystem exchange fluxes and biogeochemical cycling." 0 3 Natl acad sciences Washington ; International audience ; Biogeochemical reactions occur unevenly in space and time, but this heterogeneity is often simplified as a linear average due to sparse data, especially in subsurface environments where access is limited. For example, little is known about the spatial variability of groundwater denitrification, an important process in removing nitrate originating from agriculture and land use conversion. Information about the rate, arrangement, and extent of denitrification is needed to determine sustainable limits of human activity and to predict recovery time frames. Here, we developed and validated a method for inferring the spatial organization of sequential biogeochemical reactions in an aquifer in France. We applied it to five other aquifers in different geological settings located in the United States and compared results among 44 locations across the six aquifers to assess the generality of reactivity trends. Of the sampling locations, 79% showed pronounced increases of ...

ISI Document Delivery No.: HL0DR Times Cited: 0 Cited Reference Count: 73 Kolbe, Tamara de Dreuzy, Jean-Raynald Abbott, Benjamin W. Aquilina, Luc Babey, Tristan Green, Christopher T. Fleckenstein, Jan H. Labasque, Thierry Laverman, Anniet M. Marcais, Jean Peiffer, Stefan Thomas, Zahra Pinay, Gilles Abbott, Benjamin/0000-0001-5861-3481 European Union's Seventh Framework for research, technological development, and demonstration [607150]; European Union Innovative Training Network "INTERFACES: Ecohydrological interfaces as critical hot spots for transformations of ecosystem exchange fluxes and biogeochemical cycling" Financial support for this research was provided by the European Union's Seventh Framework for research, technological development, and demonstration under Grant 607150. This paper was supported by the European Union Innovative Training Network "INTERFACES: Ecohydrological interfaces as critical hot spots for transformations of ecosystem exchange fluxes and biogeochemical cycling." 0 3 Natl acad sciences Washington ; International audience ; Biogeochemical reactions occur unevenly in space and time, but this heterogeneity is often simplified as a linear average due to sparse data, especially in subsurface environments where access is limited. For example, little is known about the spatial variability of groundwater denitrification, an important process in removing nitrate originating from agriculture and land use conversion. Information about the rate, arrangement, and extent of denitrification is needed to determine sustainable limits of human activity and to predict recovery time frames. Here, we developed and validated a method for inferring the spatial organization of sequential biogeochemical reactions in an aquifer in France. We applied it to five other aquifers in different geological settings located in the United States and compared results among 44 locations across the six aquifers to assess the generality of reactivity trends. Of the sampling locations, 79% showed pronounced increases of ...

ISI Document Delivery No.: HL0DR Times Cited: 0 Cited Reference Count: 73 Kolbe, Tamara de Dreuzy, Jean-Raynald Abbott, Benjamin W. Aquilina, Luc Babey, Tristan Green, Christopher T. Fleckenstein, Jan H. Labasque, Thierry Laverman, Anniet M. Marcais, Jean Peiffer, Stefan Thomas, Zahra Pinay, Gilles Abbott, Benjamin/0000-0001-5861-3481 European Union's Seventh Framework for research, technological development, and demonstration [607150]; European Union Innovative Training Network "INTERFACES: Ecohydrological interfaces as critical hot spots for transformations of ecosystem exchange fluxes and biogeochemical cycling" Financial support for this research was provided by the European Union's Seventh Framework for research, technological development, and demonstration under Grant 607150. This paper was supported by the European Union Innovative Training Network "INTERFACES: Ecohydrological interfaces as critical hot spots for transformations of ecosystem exchange fluxes and biogeochemical cycling." 0 3 Natl acad sciences Washington ; International audience ; Biogeochemical reactions occur unevenly in space and time, but this heterogeneity is often simplified as a linear average due to sparse data, especially in subsurface environments where access is limited. For example, little is known about the spatial variability of groundwater denitrification, an important process in removing nitrate originating from agriculture and land use conversion. Information about the rate, arrangement, and extent of denitrification is needed to determine sustainable limits of human activity and to predict recovery time frames. Here, we developed and validated a method for inferring the spatial organization of sequential biogeochemical reactions in an aquifer in France. We applied it to five other aquifers in different geological settings located in the United States and compared results among 44 locations across the six aquifers to assess the generality of reactivity trends. Of the sampling locations, 79% showed pronounced increases of ...

ISI Document Delivery No.: HK8WZ Times Cited: 1 Cited Reference Count: 76 Thomas, Zahra Rousseau-Gueutin, Pauline Abbott, Benjamin W. Kolbe, Tamara Le Lay, Hugo Marcais, Jean Rouault, Francois Petton, Christophe Pichelin, Pascal Le Hennaff, Genevieve Squividant, Herve Labasque, Thierry de Dreuzy, Jean-Raynald Aquilina, Luc Baudry, Jacques Pinay, Gilles French National Research Agency (ANR) [ANR-08-STRA-01]; European Union Inter-national Training Network "Ecohydrological interfaces as critical hotspots for transformations of ecosystem exchange fluxes and biogeochemical cycling" [607150]; French EC2CO grant "Caracterisation hydrologique et biogeochimique de la denitrification dans les paysages"; LTSER "Zone Atelier Armorique" This research was supported in part by the French National Research Agency (ANR; Project ANR-08-STRA-01) and the European Union Inter-national Training Network "Ecohydrological interfaces as critical hotspots for transformations of ecosystem exchange fluxes and biogeochemical cycling" (ITN-INTERFACES - FP7-PEOPLE-2013-No. 607150). This research was also supported by the French EC2CO grant "Caracterisation hydrologique et biogeochimique de la denitrification dans les paysages." The study was supported by the LTSER "Zone Atelier Armorique." We thank all the farmers of the ZAAr who kindly accepted the installation of the experiments in their fields. We also thank all the staff of the ILSTER Zone Atelier Armorique, especially the technicians of OSUR-INRA-AGROCAMPUS who helped in sampling and laboratory analysis. 1 0 Springer heidelberg Heidelberg 1436-378x Si ; International audience ; Over the last half century, humans have become the dominant force driving many of Earth's cycles. Intensive agriculture has simultaneously increased nutrient loading of pastoral landscapes and decreased the capacity of these ecosystems to retain or remove excess nutrients. Widespread degradation of terrestrial and aquatic ecosystems has triggered the establishment of ecological observatories, including the Zone ...

ISI Document Delivery No.: HK8WZ Times Cited: 1 Cited Reference Count: 76 Thomas, Zahra Rousseau-Gueutin, Pauline Abbott, Benjamin W. Kolbe, Tamara Le Lay, Hugo Marcais, Jean Rouault, Francois Petton, Christophe Pichelin, Pascal Le Hennaff, Genevieve Squividant, Herve Labasque, Thierry de Dreuzy, Jean-Raynald Aquilina, Luc Baudry, Jacques Pinay, Gilles French National Research Agency (ANR) [ANR-08-STRA-01]; European Union Inter-national Training Network "Ecohydrological interfaces as critical hotspots for transformations of ecosystem exchange fluxes and biogeochemical cycling" [607150]; French EC2CO grant "Caracterisation hydrologique et biogeochimique de la denitrification dans les paysages"; LTSER "Zone Atelier Armorique" This research was supported in part by the French National Research Agency (ANR; Project ANR-08-STRA-01) and the European Union Inter-national Training Network "Ecohydrological interfaces as critical hotspots for transformations of ecosystem exchange fluxes and biogeochemical cycling" (ITN-INTERFACES - FP7-PEOPLE-2013-No. 607150). This research was also supported by the French EC2CO grant "Caracterisation hydrologique et biogeochimique de la denitrification dans les paysages." The study was supported by the LTSER "Zone Atelier Armorique." We thank all the farmers of the ZAAr who kindly accepted the installation of the experiments in their fields. We also thank all the staff of the ILSTER Zone Atelier Armorique, especially the technicians of OSUR-INRA-AGROCAMPUS who helped in sampling and laboratory analysis. 1 0 Springer heidelberg Heidelberg 1436-378x Si ; International audience ; Over the last half century, humans have become the dominant force driving many of Earth's cycles. Intensive agriculture has simultaneously increased nutrient loading of pastoral landscapes and decreased the capacity of these ecosystems to retain or remove excess nutrients. Widespread degradation of terrestrial and aquatic ecosystems has triggered the establishment of ecological observatories, including the Zone ...

ISI Document Delivery No.: HK8WZ Times Cited: 1 Cited Reference Count: 76 Thomas, Zahra Rousseau-Gueutin, Pauline Abbott, Benjamin W. Kolbe, Tamara Le Lay, Hugo Marcais, Jean Rouault, Francois Petton, Christophe Pichelin, Pascal Le Hennaff, Genevieve Squividant, Herve Labasque, Thierry de Dreuzy, Jean-Raynald Aquilina, Luc Baudry, Jacques Pinay, Gilles French National Research Agency (ANR) [ANR-08-STRA-01]; European Union Inter-national Training Network "Ecohydrological interfaces as critical hotspots for transformations of ecosystem exchange fluxes and biogeochemical cycling" [607150]; French EC2CO grant "Caracterisation hydrologique et biogeochimique de la denitrification dans les paysages"; LTSER "Zone Atelier Armorique" This research was supported in part by the French National Research Agency (ANR; Project ANR-08-STRA-01) and the European Union Inter-national Training Network "Ecohydrological interfaces as critical hotspots for transformations of ecosystem exchange fluxes and biogeochemical cycling" (ITN-INTERFACES - FP7-PEOPLE-2013-No. 607150). This research was also supported by the French EC2CO grant "Caracterisation hydrologique et biogeochimique de la denitrification dans les paysages." The study was supported by the LTSER "Zone Atelier Armorique." We thank all the farmers of the ZAAr who kindly accepted the installation of the experiments in their fields. We also thank all the staff of the ILSTER Zone Atelier Armorique, especially the technicians of OSUR-INRA-AGROCAMPUS who helped in sampling and laboratory analysis. 1 0 Springer heidelberg Heidelberg 1436-378x Si ; International audience ; Over the last half century, humans have become the dominant force driving many of Earth's cycles. Intensive agriculture has simultaneously increased nutrient loading of pastoral landscapes and decreased the capacity of these ecosystems to retain or remove excess nutrients. Widespread degradation of terrestrial and aquatic ecosystems has triggered the establishment of ecological observatories, including the Zone ...

ISI Document Delivery No.: HK8WZ Times Cited: 1 Cited Reference Count: 76 Thomas, Zahra Rousseau-Gueutin, Pauline Abbott, Benjamin W. Kolbe, Tamara Le Lay, Hugo Marcais, Jean Rouault, Francois Petton, Christophe Pichelin, Pascal Le Hennaff, Genevieve Squividant, Herve Labasque, Thierry de Dreuzy, Jean-Raynald Aquilina, Luc Baudry, Jacques Pinay, Gilles French National Research Agency (ANR) [ANR-08-STRA-01]; European Union Inter-national Training Network "Ecohydrological interfaces as critical hotspots for transformations of ecosystem exchange fluxes and biogeochemical cycling" [607150]; French EC2CO grant "Caracterisation hydrologique et biogeochimique de la denitrification dans les paysages"; LTSER "Zone Atelier Armorique" This research was supported in part by the French National Research Agency (ANR; Project ANR-08-STRA-01) and the European Union Inter-national Training Network "Ecohydrological interfaces as critical hotspots for transformations of ecosystem exchange fluxes and biogeochemical cycling" (ITN-INTERFACES - FP7-PEOPLE-2013-No. 607150). This research was also supported by the French EC2CO grant "Caracterisation hydrologique et biogeochimique de la denitrification dans les paysages." The study was supported by the LTSER "Zone Atelier Armorique." We thank all the farmers of the ZAAr who kindly accepted the installation of the experiments in their fields. We also thank all the staff of the ILSTER Zone Atelier Armorique, especially the technicians of OSUR-INRA-AGROCAMPUS who helped in sampling and laboratory analysis. 1 0 Springer heidelberg Heidelberg 1436-378x Si ; International audience ; Over the last half century, humans have become the dominant force driving many of Earth's cycles. Intensive agriculture has simultaneously increased nutrient loading of pastoral landscapes and decreased the capacity of these ecosystems to retain or remove excess nutrients. Widespread degradation of terrestrial and aquatic ecosystems has triggered the establishment of ecological observatories, including the Zone ...