Influência de uma árvore isolada de freixo (Fraxinus angustifolia Vahl ) no microclima num lameiro em Trás-os-Montes
Autor(a) principal: | |
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Data de Publicação: | 2007 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.5/1049 |
Resumo: | Changes in microclimate caused by an isolated ash tree (Fraxinus angustifolia Vahl) were assessed in a pasture land close to Bragança (41º 46’ 55’’ N; 6º 24’ 51’’ W; 510m de altitude), in Northeastern Portugal), where climate is Csb according to Köppen. The experimental site was locatedin the bottom of a small valley, and soils mostly fit the Eutric Fluvisols. Solar radiation, rainfall, and air and soil temperature were measured during three years beneath the tree canopy and in the open. Results showed that the microclimate conditions under the tree canopy were significantly different from those in the open. This is due to solar radiation interception (about 25 a 35% in winter and 55 a 65% in summer) and the interception of about 40% of the gross rainfall (52-56% during May- -October, and 35% when the foliage was absent). Mean air temperatures under the canopy were higher than those in the open, with the differences being greater at nigth, reaching about 3ºC in summer and 5ºC in winter. Compared to the open, mean soil temperatures in winter were higher (about 1ºC at 20 cm depth) beneath the canopy, but were smaller (1ºC at 2 cm depth) in summer. Amplitudes of soil and air temperature were lower under the tree canopy than in the open. These microclimate conditions under the canopy may favour both the herbaceous biomass production and the earlier development of herbaceous at the end of winter. |
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Influência de uma árvore isolada de freixo (Fraxinus angustifolia Vahl ) no microclima num lameiro em Trás-os-MontesModification of microclimate by an isolated ash-tree (Fraxinus angustifolia Vahl) in natural pastures of Northeastern Portugalfraxinus angustifolianatural pasturemicroclimatePortugallameiromicroclimaChanges in microclimate caused by an isolated ash tree (Fraxinus angustifolia Vahl) were assessed in a pasture land close to Bragança (41º 46’ 55’’ N; 6º 24’ 51’’ W; 510m de altitude), in Northeastern Portugal), where climate is Csb according to Köppen. The experimental site was locatedin the bottom of a small valley, and soils mostly fit the Eutric Fluvisols. Solar radiation, rainfall, and air and soil temperature were measured during three years beneath the tree canopy and in the open. Results showed that the microclimate conditions under the tree canopy were significantly different from those in the open. This is due to solar radiation interception (about 25 a 35% in winter and 55 a 65% in summer) and the interception of about 40% of the gross rainfall (52-56% during May- -October, and 35% when the foliage was absent). Mean air temperatures under the canopy were higher than those in the open, with the differences being greater at nigth, reaching about 3ºC in summer and 5ºC in winter. Compared to the open, mean soil temperatures in winter were higher (about 1ºC at 20 cm depth) beneath the canopy, but were smaller (1ºC at 2 cm depth) in summer. Amplitudes of soil and air temperature were lower under the tree canopy than in the open. These microclimate conditions under the canopy may favour both the herbaceous biomass production and the earlier development of herbaceous at the end of winter.Sociedade de Ciências Agrárias de PortugalRepositório da Universidade de LisboaAbreu, Francisco GonçalvesMadeira, ManuelPereira, E.2009-06-29T10:40:42Z20072007-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.5/1049por"Revista de Ciências Agrárias". ISSN 0871-018X. 30:2 (2007) 233-2450871-018Xinfo: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:RCAAP2023-03-06T14:32:20Zoai:www.repository.utl.pt:10400.5/1049Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:49:16.200867Repositório 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 |
Influência de uma árvore isolada de freixo (Fraxinus angustifolia Vahl ) no microclima num lameiro em Trás-os-Montes Modification of microclimate by an isolated ash-tree (Fraxinus angustifolia Vahl) in natural pastures of Northeastern Portugal |
title |
Influência de uma árvore isolada de freixo (Fraxinus angustifolia Vahl ) no microclima num lameiro em Trás-os-Montes |
spellingShingle |
Influência de uma árvore isolada de freixo (Fraxinus angustifolia Vahl ) no microclima num lameiro em Trás-os-Montes Abreu, Francisco Gonçalves fraxinus angustifolia natural pasture microclimate Portugal lameiro microclima |
title_short |
Influência de uma árvore isolada de freixo (Fraxinus angustifolia Vahl ) no microclima num lameiro em Trás-os-Montes |
title_full |
Influência de uma árvore isolada de freixo (Fraxinus angustifolia Vahl ) no microclima num lameiro em Trás-os-Montes |
title_fullStr |
Influência de uma árvore isolada de freixo (Fraxinus angustifolia Vahl ) no microclima num lameiro em Trás-os-Montes |
title_full_unstemmed |
Influência de uma árvore isolada de freixo (Fraxinus angustifolia Vahl ) no microclima num lameiro em Trás-os-Montes |
title_sort |
Influência de uma árvore isolada de freixo (Fraxinus angustifolia Vahl ) no microclima num lameiro em Trás-os-Montes |
author |
Abreu, Francisco Gonçalves |
author_facet |
Abreu, Francisco Gonçalves Madeira, Manuel Pereira, E. |
author_role |
author |
author2 |
Madeira, Manuel Pereira, E. |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Repositório da Universidade de Lisboa |
dc.contributor.author.fl_str_mv |
Abreu, Francisco Gonçalves Madeira, Manuel Pereira, E. |
dc.subject.por.fl_str_mv |
fraxinus angustifolia natural pasture microclimate Portugal lameiro microclima |
topic |
fraxinus angustifolia natural pasture microclimate Portugal lameiro microclima |
description |
Changes in microclimate caused by an isolated ash tree (Fraxinus angustifolia Vahl) were assessed in a pasture land close to Bragança (41º 46’ 55’’ N; 6º 24’ 51’’ W; 510m de altitude), in Northeastern Portugal), where climate is Csb according to Köppen. The experimental site was locatedin the bottom of a small valley, and soils mostly fit the Eutric Fluvisols. Solar radiation, rainfall, and air and soil temperature were measured during three years beneath the tree canopy and in the open. Results showed that the microclimate conditions under the tree canopy were significantly different from those in the open. This is due to solar radiation interception (about 25 a 35% in winter and 55 a 65% in summer) and the interception of about 40% of the gross rainfall (52-56% during May- -October, and 35% when the foliage was absent). Mean air temperatures under the canopy were higher than those in the open, with the differences being greater at nigth, reaching about 3ºC in summer and 5ºC in winter. Compared to the open, mean soil temperatures in winter were higher (about 1ºC at 20 cm depth) beneath the canopy, but were smaller (1ºC at 2 cm depth) in summer. Amplitudes of soil and air temperature were lower under the tree canopy than in the open. These microclimate conditions under the canopy may favour both the herbaceous biomass production and the earlier development of herbaceous at the end of winter. |
publishDate |
2007 |
dc.date.none.fl_str_mv |
2007 2007-01-01T00:00:00Z 2009-06-29T10:40:42Z |
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/10400.5/1049 |
url |
http://hdl.handle.net/10400.5/1049 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
"Revista de Ciências Agrárias". ISSN 0871-018X. 30:2 (2007) 233-245 0871-018X |
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 |
Sociedade de Ciências Agrárias de Portugal |
publisher.none.fl_str_mv |
Sociedade de Ciências Agrárias de Portugal |
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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1799130965690286080 |