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Outils intégratifs pour évaluer l'impact des pratiques phytosanitaires sur les cours d'eau

Abstract : In june 2014, various integrative tools were applied and tested in rivers of differentiated agricultural catchments to evaluate their interest and limits to assess the impact of agricultural practices on surface water contamination by pesticides. In fact, these tools can relieve deficiencies of grab sampling which is classically used in the monitoring networks established to answer the WFD requirements. Especially, passive samplers can provide a more representative information due to their integrative measurement over the duration of the sampler's immersion. Biomonitoring tools (caged gammarids, study of native microbial communities) can inform on the global effect of contaminants. The results of their combined implementation show the high coherence of chemical and biological tools responses. Especially, they were able to reflect the spatial (gradient up to downstream) and temporal variability (flood event) of the contamination by pesticides and to highlight existing biological impacts which was consistent with the agro-pedo-climatical context of each studied catchment. Their sensitivity, reactivity and integration capacity make these tools relevant and promising to better assess agricultural pesticide impact on surface water in addition to grab sampling.
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M. Le Dreau, Arnaud Chaumot, A. Foulquier, A. François, O. Geffard, et al.. Outils intégratifs pour évaluer l'impact des pratiques phytosanitaires sur les cours d'eau. Innovations Agronomiques, INRAE, 2015, 46, pp.51-61. ⟨10.15454/1.4622668913387212E12⟩. ⟨hal-01338198⟩



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