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Extension de la base de données géographique " Charges critiques " pour la France métropolitaine : gestion, acquisition des données et cartographie. Phase 4. Rapport final : Rapport final

Abstract : Reduction of air pollutant emissions are negotiated under the Geneva convention on long-range transboundary air pollution. These international negotiations are based on the effects of atmospheric contaminants. To quantify the effects on the ecosystems, the critical loads concept is used. A critical load geographical database (or BDGCC) was created in 1997 to manage the environmental data (soil, parent material, hydrology, vegetation, ecosystems) needed to spatially model the critical loads over the French territory. Since then the structure of the BDGCC has been regularly updated to take into account new applications (in particular geographic information system) and needs in model input parameters. With this tool, updated maps of critical loads have been regularly produced for different air pollutants. In this report, we are presenting the last works done around the BDGCC. A geographical database for the French vegetation is in progress. Based on those data as well as on the geo-pedological map made previously, a new ecosystem map is currently under construction for France. The ecosystem correponds to the modelling unit for critical loads. A finer spatial resolution as well as more detailled attributary data were needed to represent those modelling units. New results have also been obtained on the modelling of eutrophication by nitrogen. A new map of critical load for nutrient nitrogen have been produced with the empirical method. We are currently developping a new method to model the effects of nitrogen deposition on biodiversity. Some new results are also available for the modelling of metal critical loads. New data, needed to improve existind models, have been obtained. A new model for agricultural area has been developed and tested. ix
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Sophie Leguédois, Anne Probst. Extension de la base de données géographique " Charges critiques " pour la France métropolitaine : gestion, acquisition des données et cartographie. Phase 4. Rapport final : Rapport final. [Contrat] 2008. ⟨hal-02822900⟩

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