Varied impact of land use on water and sediment parameters in fish ponds of the Dombes agro-ecosystem,France |
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| Authors: | A Wezel F Arthaud C Dufloux F Renoud D Vallod J Robin |
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| Institution: | 1. Department of Agroecology and Environment , ISARA Lyon (University of Lyon) , F-69364 , Lyon Cedex 07 , France E-mail: wezel@isara.fr wezel@isara.fr;3. Department of Agroecology and Environment , ISARA Lyon (University of Lyon) , F-69364 , Lyon Cedex 07 , France E-mail: wezel@isara.fr;4. Laboratory Ecology of Fluvial Hydrosystems , UMR 5023 LEHNA, CNRS University of Lyon, ENTPE, ISARA , Villeurbanne , France;5. Department of Agroecology and Environment , ISARA Lyon (University of Lyon) , F-69364 , Lyon Cedex 07 , France E-mail: wezel@isara.fr |
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| Abstract: | Abstract Agricultural land use in the area of water bodies is generally considered to increase the nutrient status of the water body water and sediments, but is this also the case for already nutrient-rich fish ponds? We studied 83 fish ponds in the Dombes region, France, where 1100 ponds are located in a heterogeneous agricultural landscape. Different water and sediment parameters were analysed for ponds and in ditches after rainfall events. Land use was studied in the primary catchment of ponds and in a 100-m zone around ponds. Soil parameters of different land-use types were analysed and farmers interviewed about agricultural practices. Increasing cropping area in the catchment of the ponds is significantly correlated to higher PO4 3- concentration of pond water and to a lower degree, also to NO3 ?, but only in certain years with higher rainfall and with a more uneven distribution in spring. Sediment parameters were not significantly influenced. High NO3- concentration in the water of a ditch during significant rainfall events was found for a cropland dominated catchment. Citation Wezel, A., Arthaud, F., Dufloux, C., Renoud, F., Vallod, D., Robin, J., and Sarrazin, B., 2013. Varied impact of land use on water and sediment parameters in fish ponds of the Dombes agro-ecosystem, France. Hydrological Sciences Journal, 58 (4), 854–871. |
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| Keywords: | agricultural land use aquaculture catchment European Water Framework Directive eutrophication pisciculture shallow lake water quality |
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