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Partager le résultat de cette rechercheGroundwater-dependent ecosystems as transfer vectors of nitrogen from the aquifer to surface waters in agricultural basins : the fontanili of the Po Plain (Italy) / R. Balestrini in Science of the Total Environment, vol. 753 (20 January 2021)
Titre : Groundwater-dependent ecosystems as transfer vectors of nitrogen from the aquifer to surface waters in agricultural basins : the fontanili of the Po Plain (Italy) Type de document : objet à 3 dimensions, artefacts, ... Auteurs : R. Balestrini, Auteur ; A. Buffagni ; E. Sacchi ; C.A. Delconte, Auteur Année de publication : 2021 Article en page(s) : p. 1-13 Langues : Anglais (eng) Langues originales : Anglais (eng) Catégories : A HISTOIRE - Pays et ensemble de pays:Histoire de l'Europe:Europe occidentale:Italie ; C ECONOMIE - ECONOMIE SOCIALE ET SOLIDAIRE:Génie civil, militaire et minier:Technologie hydraulique:Irrigation ; F POPULATIONS - ETUDES DE CAS:D SOCIOLOGIE - ETHNOLOGIE - ANTHROPOLOGIE :4.45 Etablissements humains et utilisation des terres:Utilisation des terres ; S SCIENCES ET TECHNIQUES:Géographie et océanographie:Géomorphologie ; S SCIENCES ET TECHNIQUES:Hydrologie:Ressources en eau:Eau souterraine ; S SCIENCES ET TECHNIQUES:Sciences de la chimie:Gaz:Azote Mots-clés : 07 - ENVIRONNEMENT 7.3 - Eau. Gestion de l'Eau LAND USE MAIZE MAIS FARMYARD MANURE FUMIER GEOMORPHOLOGY GROUNDWATER NITROGEN AQUIFERS AQUIFERE POLLUTION BY AGRICULTURE POLLUTION PAR L'AGRICULTURE GROUNDWATER TABLE NAPPE SOUTERRAINE WATER MANAGEMENT GESTION DES EAUX ITALY Résumé : The most spread groundwater-dependent ecosystems in the River Po valley are semi-natural lowland springs called “fontanili”. They provide specific habitats and support high biodiversity, but are often strongly impaired by agricultural pollution. In the present study we seasonally monitored the discharge and nitrogen concentration of 48 fontanili from the Adda and the Ticino river basins. We observed a wide spatial variability of both NO3-N concentrations and flows. The annual NO3-N loads ranged from <1 to 75 t y−1 and < 1 to 29 t y−1 in the Adda and Ticino basins respectively. In the springs characterized by variable discharge the N loads were exported mostly during the summer season when water table level was elevated mainly due to irrigation. Upscaling the mean NO3-N load to each river catchment based on the total number of springs, we obtained an aerial export of 33.2 + 6.0 and 12.5 + 3.2 kg y−1 ha−1. Such loads accounted for the 30.4 and 21.5% of the N surplus estimated for the Adda and Ticino basins respectively. Random Forest analysis was performed to identify the most important environmental variables influencing the nitrate contamination in the spring waters. A total of 22 explanatory variables related to N sources, land uses, intrinsic hydrogeologic and soil proprieties, in “situ” and remotely sensed variables were considered. The percent of soil cultivated with maize in a 500 m radius buffer area surrounding the sampling site, the N from manure and the distance of each spring from the main river were the most effective factors in controlling the NO3-N concentration in the fontanili water. The outcomes of this work open up to achievable management prospects for the protection and recovery of fontanili waters, and can be particularly useful for water managers in identifying areas and sites where restoration plans should be a priority. En ligne : https://doi.org/10.1016/j.scitotenv.2020.141995 Permalink : https://cs.iut.univ-tours.fr/index.php?lvl=notice_display&id=255517
in Science of the Total Environment > vol. 753 (20 January 2021) . - p. 1-13[article] Groundwater-dependent ecosystems as transfer vectors of nitrogen from the aquifer to surface waters in agricultural basins : the fontanili of the Po Plain (Italy) [objet à 3 dimensions, artefacts, ...] / R. Balestrini, Auteur ; A. Buffagni ; E. Sacchi ; C.A. Delconte, Auteur . - 2021 . - p. 1-13.
Langues : Anglais (eng) Langues originales : Anglais (eng)
in Science of the Total Environment > vol. 753 (20 January 2021) . - p. 1-13
Catégories : A HISTOIRE - Pays et ensemble de pays:Histoire de l'Europe:Europe occidentale:Italie ; C ECONOMIE - ECONOMIE SOCIALE ET SOLIDAIRE:Génie civil, militaire et minier:Technologie hydraulique:Irrigation ; F POPULATIONS - ETUDES DE CAS:D SOCIOLOGIE - ETHNOLOGIE - ANTHROPOLOGIE :4.45 Etablissements humains et utilisation des terres:Utilisation des terres ; S SCIENCES ET TECHNIQUES:Géographie et océanographie:Géomorphologie ; S SCIENCES ET TECHNIQUES:Hydrologie:Ressources en eau:Eau souterraine ; S SCIENCES ET TECHNIQUES:Sciences de la chimie:Gaz:Azote Mots-clés : 07 - ENVIRONNEMENT 7.3 - Eau. Gestion de l'Eau LAND USE MAIZE MAIS FARMYARD MANURE FUMIER GEOMORPHOLOGY GROUNDWATER NITROGEN AQUIFERS AQUIFERE POLLUTION BY AGRICULTURE POLLUTION PAR L'AGRICULTURE GROUNDWATER TABLE NAPPE SOUTERRAINE WATER MANAGEMENT GESTION DES EAUX ITALY Résumé : The most spread groundwater-dependent ecosystems in the River Po valley are semi-natural lowland springs called “fontanili”. They provide specific habitats and support high biodiversity, but are often strongly impaired by agricultural pollution. In the present study we seasonally monitored the discharge and nitrogen concentration of 48 fontanili from the Adda and the Ticino river basins. We observed a wide spatial variability of both NO3-N concentrations and flows. The annual NO3-N loads ranged from <1 to 75 t y−1 and < 1 to 29 t y−1 in the Adda and Ticino basins respectively. In the springs characterized by variable discharge the N loads were exported mostly during the summer season when water table level was elevated mainly due to irrigation. Upscaling the mean NO3-N load to each river catchment based on the total number of springs, we obtained an aerial export of 33.2 + 6.0 and 12.5 + 3.2 kg y−1 ha−1. Such loads accounted for the 30.4 and 21.5% of the N surplus estimated for the Adda and Ticino basins respectively. Random Forest analysis was performed to identify the most important environmental variables influencing the nitrate contamination in the spring waters. A total of 22 explanatory variables related to N sources, land uses, intrinsic hydrogeologic and soil proprieties, in “situ” and remotely sensed variables were considered. The percent of soil cultivated with maize in a 500 m radius buffer area surrounding the sampling site, the N from manure and the distance of each spring from the main river were the most effective factors in controlling the NO3-N concentration in the fontanili water. The outcomes of this work open up to achievable management prospects for the protection and recovery of fontanili waters, and can be particularly useful for water managers in identifying areas and sites where restoration plans should be a priority. En ligne : https://doi.org/10.1016/j.scitotenv.2020.141995 Permalink : https://cs.iut.univ-tours.fr/index.php?lvl=notice_display&id=255517
