This article shows that combining complementary measures for reducing diffuse agricultural pollution may provide ecologically-sound results with the potential for improving water quality, by limiting pesticide transport from land to aquatic ecosystems. In this study, we evaluated the combination of pesticide mitigation measures to reduce pesticide pollution at source by limiting pesticide use and using stormwater wetlands, whereby limiting transport of runoff-related pesticide to aquatic ecosystems at the catchment's outlet. This system involves the implementation of a local policy that can only be efficient if the topography allows building a buffer zone for collecting pesticide runoff at the catchment's outlet. Although generalizing the large-scale and exclusive use of wetlands would not be efficient, our results show that the use of a stormwater wetland represents a complementary measure for reducing the use of pesticides in the framework of an ambitious pesticide reduction policy.
This study also shows that, for the same cost, pesticide transport from land to aquatic ecosystems can be reduced by up to 90% of the mass of runoff-related fungicides compared to actions undertaken at source only. This underscores that more ambitious ecological objectives can be reached while complying with cost requirements. The potential added-value of a buffer zone, such as a stormwater wetland, must also be considered in relation to the fact that a compound not emitted at source will always provide a far greater ecological guarantee than one that is partly or totally mitigated in the environment. Indeed, little is known at present of the fate and the ecotoxicological impacts of pesticide degradation products in wetlands. In addition, buffer zones can also provide other amenities and functions (biodiversity pool, combating erosion, runoff water storage), which were not mentioned here.
This article shows that combining complementary measures for reducing diffuse agricultural pollution may provide ecologically-sound results with the potential for improving water quality, by limiting pesticide transport from land to aquatic ecosystems. In this study, we evaluated the combination of pesticide mitigation measures to reduce pesticide pollution at source by limiting pesticide use and using stormwater wetlands, whereby limiting transport of runoff-related pesticide to aquatic ecosystems at the catchment's outlet. This system involves the implementation of a local policy that can only be efficient if the topography allows building a buffer zone for collecting pesticide runoff at the catchment's outlet. Although generalizing the large-scale and exclusive use of wetlands would not be efficient, our results show that the use of a stormwater wetland represents a complementary measure for reducing the use of pesticides in the framework of an ambitious pesticide reduction policy.
This study also shows that, for the same cost, pesticide transport from land to aquatic ecosystems can be reduced by up to 90% of the mass of runoff-related fungicides compared to actions undertaken at source only. This underscores that more ambitious ecological objectives can be reached while complying with cost requirements. The potential added-value of a buffer zone, such as a stormwater wetland, must also be considered in relation to the fact that a compound not emitted at source will always provide a far greater ecological guarantee than one that is partly or totally mitigated in the environment. Indeed, little is known at present of the fate and the ecotoxicological impacts of pesticide degradation products in wetlands. In addition, buffer zones can also provide other amenities and functions (biodiversity pool, combating erosion, runoff water storage), which were not mentioned here.
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