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Spatial distribution and uncertainties of nitrogen budgets for agriculture in the Tagus river basin in Portugal - implications for effectiveness of mitigation measures

2019Journal article Open access
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dc.contributor.authorCameira, Maria
dc.contributor.authorRolim, João
dc.contributor.authorValente, Fernanda
dc.contributor.authorFaro, Afonso
dc.contributor.authorDragosits, Ulrike
dc.contributor.authorCordovil, Cláudia
dc.date.accessioned2019-04-02T11:02:30Z
dc.date.available2019-04-02T11:02:30Z
dc.date.issued2019
dc.description.abstractThe present study describes a methodology to quantify the gross soil nitrogen balance (SNB) for agricultural land use in the Tagus Nitrate Vulnerable Zone (TVZ) between 1989 and 2016, including effects of implementation of the EC Nitrates Directive (ND, 91/676/EEC) since 2004. The study uses decadal information from National Agricultural Census at parish level and is supported by a Geographical Information System (GIS). The average SNB of the TVZ decreased significantly (p < 0.001) from 125 kg ha−1 in 1989 to 63 kg ha−1 in 2016 (on average 1.8 kg ha−1 yr−1). The N input via irrigation water was particularly high in seven municipalities where it represents up to 35% of the total inputs. Using a Monte Carlo approach, the average uncertainty of the SNB was calculated at 12%. The most important sources of uncertainty were mineral fertilization, nitrate concentration in groundwater used for irrigation and the percentage of farmers complying with ND measures. GIS analysis shows that, at the scale of municipalities, the SNB has decreased since the ND implementation in regions dominated by irrigated intensive crop production, while the SNB has stabilized in municipalities in the south of TVZ with intensive livestock production (75% of area). We conclude that the implementation of ND and national measures to reduce the SNB was not equally effective across the TVZ. Our results indicate that the most effective measures to reduce the SNB in the future are increasing compliance of farmers with the ND related measures and measures increasing the nitrogen use efficiency of livestock manurespt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationLand Use Policy 84 (2019) 278-293pt_PT
dc.identifier.doihttps://doi.org/10.1016/j.landusepol.2019.02.028pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.5/17682
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation.publisherversionwww.elsevier.com/locate/landusepolpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectNitrates directivept_PT
dc.subjectvulnerable zones to nitratespt_PT
dc.subjectN surpluspt_PT
dc.subjectspatializationpt_PT
dc.subjecttrend analysispt_PT
dc.subjectMonte Carlopt_PT
dc.titleSpatial distribution and uncertainties of nitrogen budgets for agriculture in the Tagus river basin in Portugal - implications for effectiveness of mitigation measurespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.titleLand Use Policypt_PT
person.familyNamedo Rosário da Conceição Cameira
person.familyNameRolim Fernandes Machado Lopes
person.familyNameFaro
person.familyNameMarques dos Santos Cordovil
person.givenNameMaria
person.givenNameJoão Rui
person.givenNameAfonso
person.givenNameCláudia
person.identifier.ciencia-idB418-5A61-8B8B
person.identifier.ciencia-idDB10-1A20-7D98
person.identifier.ciencia-idED10-B19E-CFFA
person.identifier.orcid0000-0002-2186-5172
person.identifier.orcid0000-0003-1782-2732
person.identifier.orcid0000-0002-0700-7809
person.identifier.orcid0000-0001-8864-2611
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublicationf6bba224-7c13-4969-bf4d-e4d4d75e6f2c
relation.isAuthorOfPublicationf293b73b-9381-4e3f-85b6-895451c06d4d
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relation.isAuthorOfPublication.latestForDiscoveryf293b73b-9381-4e3f-85b6-895451c06d4d

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