title: Do constructed wetlands in grass strips reduce water contamination from drained fields?
abstract: This study evaluates the efficiency of two small constructed wetlands installed in the regulatory grass strips between a drained plot and a river. The observed nitrate removal efficiencies were independent of the season or type of constructed wetland and ranged from 5.4 to 10.9% of the inlet amounts. The pesticide mass budgets ranged from -618.5 to 100%, depending on the molecule. The negative efficiencies were attributed to runoff and remobilization. In contrast, the highest efficiencies were associated with pesticides with high Koc and low DT50 (half-life) values, suggesting sorption and degradation. However, the effectiveness of these wetlands is limited for pesticides with low Koc or high DT50 values; thus, the use of these molecules must be reduced. Increasing the number of these small, inexpensive and low-maintenance wetlands in the agricultural landscape would reduce the level of water pollution whilst preserving the extent of cultivated land, but their long-term effectiveness should be evaluated.
authors.affiliation: LIEC, UMR 7360 CNRS - Université de Lorraine, Bd des Aiguillettes, BP 70239, 54506 Vandœuvre-lès-Nancy, France.
authors.forename: Romain
authors.initials: R
authors.lastname: Vallée
authors.affiliation: LIEC, UMR 7360 CNRS - Université de Lorraine, Bd des Aiguillettes, BP 70239, 54506 Vandœuvre-lès-Nancy, France. Electronic address: sylvie.dousset@univ-lorraine.fr.
authors.forename: Sylvie
authors.initials: S
authors.lastname: Dousset
authors.affiliation: Chambre Régionale d'Agriculture de Lorraine, 9 Rue de la Vologne, Bâtiment I, 54520 Laxou, France.
authors.forename: François-Xavier
authors.initials: FX
authors.lastname: Schott
authors.affiliation: ANSES, Nancy Laboratory for Hydrology, Water Chemistry Department, 40 Rue Lionnois, 54000 Nancy, France.
authors.forename: Christelle
authors.initials: C
authors.lastname: Pallez
authors.affiliation: ANSES, Nancy Laboratory for Hydrology, Water Chemistry Department, 40 Rue Lionnois, 54000 Nancy, France.
authors.forename: Agnès
authors.initials: A
authors.lastname: Ortar
authors.affiliation: Chambre Régionale d'Agriculture de Lorraine, 9 Rue de la Vologne, Bâtiment I, 54520 Laxou, France.
authors.forename: Richard
authors.initials: R
authors.lastname: Cherrier
authors.affiliation: ANSES, Nancy Laboratory for Hydrology, Water Chemistry Department, 40 Rue Lionnois, 54000 Nancy, France.
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Munoz
authors.affiliation: INRA, unité ASTER, UR 055, 662 Avenue Louis Buffet, 88500 Mirecourt, France.
authors.forename: Marc
authors.initials: M
authors.lastname: Benoît
mesh_terms: D000383:Agriculture; D004323:Drainage, Sanitary; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006207:Half-Life; D010575:Pesticides / Q000032:analysis*; D006109:Poaceae / Q000254:growth & development*; D012621:Seasons; D014874:Water Pollutants, Chemical / Q000032:analysis*; D053833:Wetlands
chemical_list: D010575:Pesticides; D014874:Water Pollutants, Chemical
keywords: Constructed wetland; Field-scale; Nitrate; Pesticide; Remediation