Titre | Nitrogen fertilizer impact on the Wilmot watershed aquifer in Prince Edward Island, Canada |
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Auteur | van Bochove, E; Savard, M M ; Thériault, G; Cherif, R; Ziadi, N; MacLeod, J |
Source | Water Science and Technology vol. 56, no. 1, 2007 p. 243-251, https://doi.org/10.2166/wst.2007.458 Accès ouvert |
Année | 2007 |
Séries alt. | Secteur des sciences de la Terre, Contribution externe 20100311 |
Éditeur | IWA Publishing |
Document | publication en série |
Lang. | anglais |
DOI | https://doi.org/10.2166/wst.2007.458 |
Media | papier; en ligne; numérique |
Formats | pdf |
Province | Île-du-Prince-Édouard |
SNRC | 11L/05 |
Région | Wilmot |
Lat/Long OENS | -64.0000 -63.5000 46.5000 46.2500 |
Sujets | aquifères; eau souterraine; régimes des eaux souterraines; pollution de l'eau souterraine; écoulement de la nappe d'eau souterraine; ressources en eau souterraine; nitrate; sols; études pédologiques;
géochimie du sol; pollution; hydrogéologie; géologie de l'environnement; pédologie |
Illustrations | histogrammes; tableaux; cartes de localisation |
Programme | Programme de cartographie des eaux souterraines |
Résumé | (disponible en anglais seulement) The objective of this study is to estimate the soil N flux from the vadose zone to the aquifer of the Wilmot watershed (Prince Edward Island, Canada) for a
typical three-year cropping rotation (barley - red clover - potato). A conceptual model estimates that 199 - 221 tons of N were yearly available for leaching at the watershed scale. A significant portion of this N amount was available for leaching at
the end of the crop season representing 80-90% of the annual N balance. Drainage water nitrate concentrations were significantly higher after the potato-rotation year than during the crop season. Low nitrate concentrations were measured at spring
thaw indicating that most of the nitrate available from the preceding potato crop season was likely leached at the end of fall or during winter. Early spring ionic exchange membrane sampling show a large availability of nitrate in soil possibly
throughout winter as well, resulting from soil N mineralization and nitrification over the winter period. These findings are corroborated by the isotope natural abundance analysis of nitrate in groundwater implying that nitrifiers are significantly
active during winter, as well as during the crop season, and that leaching of soil nitrates with seasonal signals takes place whenever recharge is occurring. |
GEOSCAN ID | 287265 |
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