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Título: | High N retention in Mediterranean catchments enhanced by water management practices |
Autor: | Romero, Estela CSIC ORCID; Lassaletta, Luis CSIC; Garnier, Josette; Billen, Gilles; Peters, Francesc CSIC ORCID | Palabras clave: | River basin Reservoirs Water regulation Mediterranean climate Irrigation |
Fecha de publicación: | 4-dic-2016 | Citación: | 7th International Nitrogen Initiative Conference (2016) | Resumen: | The share of nitrogen (N) that is exported to the sea or accumulated on land (N retention, sensu lato) involves different environmental processes; coastal eutrophication and anoxia in the first case; the acidification of soils, the emission of ammonia and greenhouse gases, and the pollution of aquifers in the latter. Nevertheless, the factors involved in N retention are still poorly constrained, particularly in arid and semi-arid systems. The present study evaluates the N fluxes of 38 catchments on the Iberian Peninsula with contrasting climatic characteristics (temperate and Mediterranean), land uses, and water management practices. The contribution of physical and socio-ecological factors in the retention of N was partitioned, and the link between N retention and water regulation was explored. We hypothesize that the extreme flow regulation performed in the Mediterranean enhances the high N retention values associated with arid and semi-arid regions. Our results show that reservoirs and irrigation channels account for >50% of the variability in N retention values, and above a certain regulation threshold, N retention peaks to values >85- 90%. Future climate projections forecast a decrease in rainfall and an increase in agricultural intensification and irrigation practices in many world regions, and notably in arid and semi-arid areas. Increased water demands will likely lead to a higher flow regulation, and the situation may resemble that of Mediterranean Iberian Peninsula catchments. High N retention and the associated environmental risks must therefore be considered as an important consequence of water regulation practices, and must be adequately managed | Descripción: | 7 th International Nitrogen Initiative Conference (INI 2016), "Solutions to improve nitrogenuse efficiency for the world", 4-8 December 2016, Melbourne, Australia | Versión del editor: | http://www.ini2016.com/conference-proceedings-2 | URI: | http://hdl.handle.net/10261/171805 |
Aparece en las colecciones: | (ICM) Comunicaciones congresos |
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Romero_et_al_2016_poster.pdf | 26,9 MB | Adobe PDF | Visualizar/Abrir | |
Romero_et_al_2016.pdf | 213,53 kB | Adobe PDF | Visualizar/Abrir | |
Romero_et_al_2016_presentation.pdf | 247,96 kB | Adobe PDF | Visualizar/Abrir |
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