Séminaire de Zhara AKBARZADEH (University of Waterloo, Canada)


 Olivier Troccaz    27/11/2018 : 10:30

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Le vendredi 30 novembre 2018 à 13h00, salle de conférences de l'OSUR, bâtiment 14b, Campus de Beaulieu, UR1

Le vendredi 30 novembre 2018 à 13h00, salle de conférences de l'OSUR, bâtiment 14b, Campus de Beaulieu, UR1

Effects of damming on river nitrogen fluxes: a global analysis

Abstract: Together with phosphorus (P), nitrogen (N) is the major macronutrient limiting or co-limiting the biological productivity of freshwater and marine ecosystems. This study shows that damming significantly changes the fate and transport of N along river networks. Damming creates hotspots of biological activity by promoting the in-reservoir biogeochemical processing of nutrients. Globally, dams eliminate N by burial in sediments accumulating in reservoirs and through the emission of gaseous products of denitrification to the atmosphere. They also increase the N:P ratio of riverine discharge, principally due to in-reservoir N fixation, thereby reducing N limitation of primary production in receiving lentic and coastal marine environments. Damming therefore has important implications for managing the impacts of cultural eutrophication.

Contact: Zhara AKBARZADEH





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