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A Hydrological Modeling Framework for Defining Achievable Performance Standards for Pesticides.

Rousseau, Alain N.; Lafrance, Pierre; Lavigne, Martin-Pierre; Savary, Stéphane; Konan, Brou; Quilbé, Renaud; Jiapizian, Paul; Amrani, Mohamed (2012). A Hydrological Modeling Framework for Defining Achievable Performance Standards for Pesticides. Journal of Environment Quality , vol. 41 , nº 1. p. 52-63. DOI: 10.2134/jeq2010.0281.

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Résumé

This paper proposes a hydrological modeling framework to define achievable performance standards (APSs) for pesticides that could be attained after implementation of recommended management actions, agricultural practices, and available technologies (i.e., beneficial management practices [BMPs]). An integrated hydrological modeling system, Gestion Intégrée des Bassins versants à l'aide d'un Système Informatisé, was used to quantify APSs for six Canadian watersheds for eight pesticides: atrazine, carbofuran, dicamba, glyphosate, MCPB, MCPA, metolachlor, and 2,4-D. Outputs from simulation runs to predict pesticide concentration under current conditions and in response to implementation of two types of beneficial management practices (reduced pesticide application rate and 1- to 10-m-wide edge-of-field and/or riparian buff er strips, implemented singly or in combination) showed that APS values for scenarios with BMPs were less than those for current conditions. Moreover, APS values at the outlet of watersheds were usually less than ecological thresholds of good condition, when available. Upstream river reaches were at greater risk of having concentrations above a given ecological thresholds because of limited stream flows and overland loads of pesticides. Our integrated approach of "hydrological modeling-APS estimation-ecotoxicological significance" provides the most eff ective interpretation possible, for management and education purposes, of the potential biological impact of predicted pesticide concentrations in rivers.

Type de document: Article
Mots-clés libres: achievable performance; agricultural practices; application rates; biological impacts; carbofurans; dicamba; glyphosates; hydrological modeling; integrated approach; management practices; metolachlors
Centre: Centre Eau Terre Environnement
Date de dépôt: 19 oct. 2018 13:58
Dernière modification: 19 oct. 2018 13:58
URI: http://espace.inrs.ca/id/eprint/7233

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