Spatial distribution and uncertainties of nitrogen budgets for agriculture in the Tagus river basin in Portugal - implications for effectiveness of mitigation measures
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.5/17682 |
Resumo: | The 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 manures |
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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 measuresNitrates directivevulnerable zones to nitratesN surplusspatializationtrend analysisMonte CarloThe 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 manuresElsevierRepositório da Universidade de LisboaCameira, MariaRolim, JoãoValente, FernandaFaro, AfonsoDragosits, UlrikeCordovil, Cláudia2019-04-02T11:02:30Z20192019-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.5/17682engLand Use Policy 84 (2019) 278-293https://doi.org/10.1016/j.landusepol.2019.02.028info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-03-06T14:47:21Zoai:www.repository.utl.pt:10400.5/17682Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T17:02:50.429353Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Spatial distribution and uncertainties of nitrogen budgets for agriculture in the Tagus river basin in Portugal - implications for effectiveness of mitigation measures |
title |
Spatial distribution and uncertainties of nitrogen budgets for agriculture in the Tagus river basin in Portugal - implications for effectiveness of mitigation measures |
spellingShingle |
Spatial distribution and uncertainties of nitrogen budgets for agriculture in the Tagus river basin in Portugal - implications for effectiveness of mitigation measures Cameira, Maria Nitrates directive vulnerable zones to nitrates N surplus spatialization trend analysis Monte Carlo |
title_short |
Spatial distribution and uncertainties of nitrogen budgets for agriculture in the Tagus river basin in Portugal - implications for effectiveness of mitigation measures |
title_full |
Spatial distribution and uncertainties of nitrogen budgets for agriculture in the Tagus river basin in Portugal - implications for effectiveness of mitigation measures |
title_fullStr |
Spatial distribution and uncertainties of nitrogen budgets for agriculture in the Tagus river basin in Portugal - implications for effectiveness of mitigation measures |
title_full_unstemmed |
Spatial distribution and uncertainties of nitrogen budgets for agriculture in the Tagus river basin in Portugal - implications for effectiveness of mitigation measures |
title_sort |
Spatial distribution and uncertainties of nitrogen budgets for agriculture in the Tagus river basin in Portugal - implications for effectiveness of mitigation measures |
author |
Cameira, Maria |
author_facet |
Cameira, Maria Rolim, João Valente, Fernanda Faro, Afonso Dragosits, Ulrike Cordovil, Cláudia |
author_role |
author |
author2 |
Rolim, João Valente, Fernanda Faro, Afonso Dragosits, Ulrike Cordovil, Cláudia |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Repositório da Universidade de Lisboa |
dc.contributor.author.fl_str_mv |
Cameira, Maria Rolim, João Valente, Fernanda Faro, Afonso Dragosits, Ulrike Cordovil, Cláudia |
dc.subject.por.fl_str_mv |
Nitrates directive vulnerable zones to nitrates N surplus spatialization trend analysis Monte Carlo |
topic |
Nitrates directive vulnerable zones to nitrates N surplus spatialization trend analysis Monte Carlo |
description |
The 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 manures |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-04-02T11:02:30Z 2019 2019-01-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.5/17682 |
url |
http://hdl.handle.net/10400.5/17682 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Land Use Policy 84 (2019) 278-293 https://doi.org/10.1016/j.landusepol.2019.02.028 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799131118712127488 |