Catchment planning and the nitrate issue : a UK perspective
Agriculture ; Bassin-versant ; England ; Nitrate ; Pollution ; Qualité de l'eau ; Royaume-Uni ; Utilisation du sol
Catchment area;Watershed ; England ; Farming;Agriculture ; Land use ; Nitrate ; Pollution ; United Kingdom ; Water quality
Examines nitrogen cycling in rural catchments, placing particular emphasis on the delivery of nitrate to the stream system. Nitrate levels in UK freshwaters are reviewed. The possibility of controlling nitrate loss by managing land use is discussed
La pollution des eaux souterraines par les nitrates en Lorraine
Amendement des sols ; Eau souterraine ; France ; Géographie de l'Europe ; Lorraine ; Minéralisation ; Nappe aquifère ; Nitrate ; Pollution ; Pollution de l'eau
Cette pollution peut avoir des origines agricole, industrielle ou domestique, et relève de la minéralisation de l'azote organique sous forme de nitrate soluble. Les nitrates sont plus ou moins entraînés vers les nappes phréatiques selon les
conditions climatiques et le couvert végétal. Hausse irrégulière, mais globale des taux de nitrates de 1976 à 1989.
Evaluation of the Burns model for nitrate movement in wet sandy soils
Belgique ; Géographie physique ; Lessivage ; Modèle ; Nitrate ; Pédologie ; Sol ; Technique de recherche ; Vlaanderen
A simple model to predict nitrate leaching developed by Burns (1974) was tested, in 1 m profiles from the East and West Flanders. The results show reasonably good agreement between the two values.
Nitrate nitrogen in the Belgian course of the Meuse River - Rate of the concentrations and origin of the inputs
Bassin-versant ; Belgique ; Bilan géochimique ; Cycle biogéochimique ; Géochimie ; Géographie de l'Europe ; Meuse ; Nitrate
A model for calculating the annual NO3-N influxes along the Belgian part of the river Meuse is presented. The model traced specific inputs and losses and showed the dependence between the river and its watershed. A nitrate budget for the studied
Clorophyll and nitrate fine structure in the southeastern Bering Sea shelf break front
Chlorophylle ; Front de bord de plate-forme ; Front océanique ; Géographie physique ; Hydrologie marine ; Mer de Bering ; Nitrate ; Pacifique, îles ; Shelf break front
The results of a two-year lysimeter investigation into the effects of fertiliser nitrogen (N) combined with pig or cattle slurry applied in winter or early spring on nitrate (NO3-N) leaching are presented. Soil type, fertiliser N and a combination
Environmental standards versus structural changes as sustainability alternatives: an empirical evaluation of nitrate pollution control
Analyse multicritère ; Calcul économique ; Développement durable ; Engrais ; Environnement ; Gestion des ressources ; Lutte contre la pollution ; Nitrate ; Programmation linéaire ; Royaume-Uni
Economic cost ; Environment ; Fertilizer ; Linear programming ; Multi-criteria analysis ; Nitrate ; Pollution control ; Resource management ; Sustainable development ; United Kingdom
The relevance of the sustainability debate to practical decisionmaking is tested in an empirical context of nitrate pollution control in eastern England. Five alternative criteria are specified for examination. These are assessed and compared
Sensitivity of DaisyGIS to LAI : implications for land use based modelling of nitrate leaching
Analyse de sensibilité ; Indice de végétation ; Lessivage ; Modélisation ; Nitrate ; Système d'information géographique ; Télédétection ; Utilisation du sol
Geographical information system ; Land use ; Leaching ; Modelling ; Nitrate ; Remote sensing ; Sensitivity analysis ; Vegetation index
Etablissement de la sensibilité du SIG Daisy aux changements de l'indice de surface de feuille (Leaf Area Index) et discussion des implications pour la modélisation de l'utilisation des sols du lessivage des nitrates en utilisant la télédétection
Nitrate-nitrogen flux and utilization in a stream ecosystem during low summer flows
Auto-épuration ; Canada ; Cours d'eau ; Cycle biogéochimique ; Cycle de l'azote ; Duffin creek ; Eau ; Ecosystème ; Etiage ; Eté ; Expérimentation ; Géographie de l'Amérique ; Nitrate ; Ontario ; Pollution ; Qualité de l'eau
A propos du bassin hydrographique du Duffin Creek, au N. E. de Toronto, des expériences en laboratoire suggèrent que presque toute la disparition du nitrate dans la rivière est causée par la dénitrification bactérienne et la réduction du nitrate
Flow and chemical composition of drainage water from farmland in the Belgian loamy region. Part 2. Patterns of irons leaching with particular reference to nitrate
The nitrate quality limit of 50 mg NO3/l could be exceeded in the autumn, winter or spring, depending on the soil mineral nitrogen content and rainfall. Nitrogen leaching losses were related to rainfall distribution and agricultural practices
. They were lower for land under cereals than under sugar-beets. When the available nitrogen for leaching was high, nitrate and chloride were not leached together. At this moment, the NO3 concentration was positively related with the flowrate and the Ca
content, but negatively with the Cl content. Relation between flow and nitrate concentration is discussed in terms of possible water flow, piston flow or macropores flow. - (L'A.).
Pollution des eaux souterraines par les nitrates dans la CEI et les pays avoisinants
Eau souterraine ; Ex-URSS ; Hydrochimie ; Hydrogéologie ; Nitrate ; Pollution ; Pollution de l'eau ; Qualité de l'eau
Former USSR ; Groundwater ; Hydrochemistry ; Hydrogeology ; Nitrate ; Pollution ; Water pollution ; Water quality
Etude de la répartition des nitrates dans les eaux souterraines de la CEI et des pays avoisinants. Etablissement d'une carte schématique de l'intensité de la pollution des eaux souterrines par les nitrates. Etude des caractéristiques géochimiques de
A three-year investigation into the effects of nitrogen (N) fertiliser rates and rainfall on nitrate-N (NO3-N) leaching from spring barley and Fallow was carried out in a lysimeter unit. The soils was well drained, moderately deep and similar
to soils used to grow cereals in Ireland. The Fallow treatment resulted in large removals of N in the drainage water with high concentrations of NO3-N. The relative importance of the results to the designation of Nitrate Vulnerable Zones and possible
Eau ; Eaux de surface ; Géographie humaine ; Nitrate ; Pollution ; Pollution des eaux
The increase of the nitrate concentration in surface waters used as water supply resources has been investigated with a view to the effects of agricultural activities and atmospheric precipitation. The variability of nitrate concentrations depends
In this paper, the A. examines the changes in space and time of the nitrate content of groundwater in two mountain villages. The effects of precipitation and different emission sources are also investigated. - (JS)
This paper investigates how geomorphological conditions and human activities influence the extent of nitrate contamination of groundwater. An attempt was made to plot a map of nitrate-contamination hazard. The areal distribution of heavy metal
Trend of the nitrate and ammonium content of precipitation water in Hungary for the last 80 years
(1902-1981) ; Ammonium ; Atmosphère ; Eau de pluie ; Europe ; Europe centrale ; Géographie physique ; Hongrie ; Hydrochimie ; Nitrate ; Pluie acide ; Pollution ; Pollution atmosphérique ; Précipitation ; Siècle XX ; Série chronologique
La teneur des précipitations en nitrates aurait été multipliée par sept, en Hongrie, depuis 1902, avec un maximum de printemps très accusé. La concentration en sels ammoniacaux aurait globalement diminué de 20 %, mais augmenté au printemps et en été
The protection potential of soils and post-Jurassic covers against nitrate seepage (Southern Franconian Jura, Germany)
Allemagne ; Bassin-versant ; Formation superficielle ; Franken ; Hydrochimie ; Jura ; Karst ; Lutte contre la pollution ; Nitrate ; Pollution de l'eau ; Propriétés du sol ; Roche carbonatée ; Source ; Utilisation agricole du sol
Agricultural land use ; Carbonate rock ; Franconia ; Germany ; Hydrochemistry ; Jura ; Karst ; Nitrate ; Pollution control ; Soil properties ; Spring ; Surface deposits ; Water pollution ; Watershed
The mid-mountain plateau of the Southern Franconian Jura exhibits base rocks of bedded and massive Upper Jurassic (Malm) carbonate rocks. These only provide a low protection potential against nitrate seepage. Hence, post-Jurassic covers may play
an important role for a sustainable fresh water protection. Extensive tracer analyses in the Southern Franconian Jura offer the opportunity to investigate nitrate outputs on the basis on karst spring catchments. According to geomorphological and pedological
criteria, the Southern Franconian Jura is characterised by 4 landscape types which reveal different protection potentials against nitrate seepage. Within the uncovered zone of the Franconian Jura the karst spring waters exhibit enhanced nitrate contents
Experimentation ; Hydrochemistry ; Hydrology ; Mathematical model ; Meltwater ; Model ; Nitrate ; Runoff ; Slovak Republic ; Snow ; Water ; Watershed
l'élaboration d'un modèle mathématique de la formation de l'écoulement et de la migration des nitrates dans les bassins-versants d'Europe centrale. Bref exposé des résultats des recherches (1989-1992) dans 2 petits bassins-versants représentatifs, situés dans