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Water 2018, 10(4), 406; https://doi.org/10.3390/w10040406

A Simplified Nitrogen Assessment in Tagus River Basin: A Management Focused Review

1
LEAF—Linking Landscape, Environment, Agriculture and Food, School of Agriculture, University of Lisbon, Tapada da Ajuda, 1349-017 Lisbon, Portugal
2
Department of Biosciences, University of Aarhus, Vejlsovej 25, 8600 Silkeborg, Denmark
*
Author to whom correspondence should be addressed.
Received: 10 October 2017 / Revised: 26 March 2018 / Accepted: 27 March 2018 / Published: 30 March 2018
(This article belongs to the Special Issue Innovation Issues in Water, Agriculture and Food)
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Abstract

Interactions among nitrogen (N) management and water resources quality are complex and enhanced in transboundary river basins. This is the case of Tagus River, which is an important river flowing from Spain to Portugal in the Iberian Peninsula. The aim was to provide a N assessment review along the Tagus River Basin regarding mostly agriculture, livestock, and urban activities. To estimate reactive nitrogen (Nr) load into surface waters, emission factor approaches were applied. Nr pressures are much higher in Spain than in Portugal (~13 times), which is mostly because of livestock intensification. Some policy and technical measures have been defined aiming at solving this problem. Main policy responses were the designation of Nitrate Vulnerable and Sensitive Zones, according to European Union (EU) directives. Nitrate Vulnerable Zone comprise approximately one third of both territories. On the contrary, Sensitive Zones are more extended in Spain, attaining 60% of the watershed, against only 30% in Portugal. Technical measures comprised advanced urban and industrial wastewater treatment that was designed to remove N compounds before discharge in the water bodies. Given this assessment, Tagus River Basin sustainability can only be guaranteed through load inputs reductions and effective transnational management processes of water flows. View Full-Text
Keywords: agriculture; impact; measures; nitrogen; Sensitive Zones; Tagus River Basin; Vulnerable Zones agriculture; impact; measures; nitrogen; Sensitive Zones; Tagus River Basin; Vulnerable Zones
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Cordovil, C.M.S.; Cruz, S.; Brito, A.G.; Cameira, M.R.; Poulsen, J.R.; Thodsen, H.; Kronvang, B. A Simplified Nitrogen Assessment in Tagus River Basin: A Management Focused Review. Water 2018, 10, 406.

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