Description du projet
Comment contrôler la qualité de la matière organique dissoute
Les cours d’eau reçoivent d’importants apports terrestres de matière organique dissoute (MOD). De nombreux bassins versants de l’hémisphère nord sont concernés par ce grave problème environnemental. La MOD détériore la qualité de l’eau et affecte le fonctionnement biogéochimique et écologique des écosystèmes aquatiques. Dans ce contexte, le projet COSTREAM, soutenu par le programme Actions Marie Skłodowska-Curie, explorera les liens entre les actions de gestion et la variabilité de la MOD des cours d’eau. Plus précisément, il s’agira d’étudier l’impact des engrais minéraux azotés sur la production de MOD terrestres à l’échelle saisonnière. Il examinera également comment les plans de gestion de l’utilisation des sols interagissent avec les changements de facteurs climatiques pour réguler les modèles de MOD des cours d’eau à l’échelle régionale. Ces résultats contribueront à améliorer les solutions de gestion et de restauration fondées sur la science.
Objectif
The rising trends in terrestrial dissolved organic matter (DOM) concentrations in streams have become a serious environmental issue in many catchments of the northern hemisphere. Indeed, DOM impairs water quality and affects the biogeochemical and ecological functioning of aquatic ecosystems. Knowledge gaps in drivers controlling seasonal and interannual variations of stream DOM limit our ability to provide measures that may be implemented by decision makers in order to mitigate the continuing trends. In rural landscapes, agricultural practices interact with climatic drivers to affect biogeochemical cycles, however these interactions and their impacts on stream DOM dynamics over different timescales have not been considered so far. The ambition of COSTREAM is to provide a better understanding of the linkages between management actions and stream DOM variability both spatially and temporally in order to enhance science-based management and restoration solutions. The project will combine field and experimental studies in a well-equipped agricultural catchment with data mining of long-term records collected in the French Brittany region. The main objectives are 1) to investigate the impact of nitrogen mineral fertilizer on the production of terrestrial DOM at the seasonal scale, and 2) to determine how land use management plans during the last decades have interacted with shifts in climatic drivers to regulate stream DOM patterns at the regional scale. The COSTREAM project has potentially strong impacts on both scientific and societal perspectives. Thanks to this project, the experienced researcher will receive a unique multidisciplinary scientific training by INRAE that will reinforce significantly his expertise for future research activities and open new perspectives for both academic and non-academic careers.
Champ scientifique
Programme(s)
- HORIZON.1.2 - Marie Skłodowska-Curie Actions (MSCA) Main Programme
Régime de financement
HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European FellowshipsCoordinateur
75007 Paris
France