Analysing eucalypt expansion in Portugal as a fire-regime modifier
Autor(a) principal: | |
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Data de Publicação: | 2019 |
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/10174/28059 https://doi.org/10.1016/j.scitotenv.2019.02.237 |
Resumo: | Eucalypts, especially blue gum (Eucalyptus globulus), have been extensively planted in Portugal and nowadays dominate most of its forest landscapes. Large-scale forestation programs can intensify fire activity, and blue gum plantations are often viewed as highly flammable due to the nature and structure of the fuel complex. The role of eucalypt plantations in the fire regime of Mediterranean climate regions is increasingly debated following the recent catastrophic wildfires in Portugal and elsewhere. In this study we examined the effects of eucalypt forestation on burned area (BA), fire size, and fire severity in Portugal. This was based on fire and vegetation mapping and statistics, fire weather data, satellite imagery, and national forest inventory data. Eucalypt BA comprised an average of 12.5% of total BA (1980–2017) and did not increase over time and with eucalypt expansion. Eucalypt metrics did not explain interannual BA variability after accounting for the effects of other variables. Forest fires started within eucalypt stands were the least likely to become large, and large fire size was irresponsive to forest composition. Likewise, forest type was a generally minor influence in mega-fire severity and accounted for just 1.4–8.6% of surface fuel-hazard metrics variation. In general, large-scale conversion of maritime pine to eucalypt stands (1970–2015) implied lower fuel accumulation. Fire activity results are consistent with fuel hazard results and express trade-offs between short-rotation forestry and fire behaviour in blue gum stands, with high spotting potential versus modest crown fire likelihood. We found no support for the contention of a modified fire regime as a result of eucalypt forestation in Portugal, but the rising undermanaged and abandoned blue gum estate, especially after large-fire seasons, is a concern for the future. However, it remains to be determined whether post-fire eucalypt regrowth is a higher fire threat than native vegetation in the same context. |
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Analysing eucalypt expansion in Portugal as a fire-regime modifierForest plantationsFire severityLand cover changeMediterranean climateWildfireEucalypts, especially blue gum (Eucalyptus globulus), have been extensively planted in Portugal and nowadays dominate most of its forest landscapes. Large-scale forestation programs can intensify fire activity, and blue gum plantations are often viewed as highly flammable due to the nature and structure of the fuel complex. The role of eucalypt plantations in the fire regime of Mediterranean climate regions is increasingly debated following the recent catastrophic wildfires in Portugal and elsewhere. In this study we examined the effects of eucalypt forestation on burned area (BA), fire size, and fire severity in Portugal. This was based on fire and vegetation mapping and statistics, fire weather data, satellite imagery, and national forest inventory data. Eucalypt BA comprised an average of 12.5% of total BA (1980–2017) and did not increase over time and with eucalypt expansion. Eucalypt metrics did not explain interannual BA variability after accounting for the effects of other variables. Forest fires started within eucalypt stands were the least likely to become large, and large fire size was irresponsive to forest composition. Likewise, forest type was a generally minor influence in mega-fire severity and accounted for just 1.4–8.6% of surface fuel-hazard metrics variation. In general, large-scale conversion of maritime pine to eucalypt stands (1970–2015) implied lower fuel accumulation. Fire activity results are consistent with fuel hazard results and express trade-offs between short-rotation forestry and fire behaviour in blue gum stands, with high spotting potential versus modest crown fire likelihood. We found no support for the contention of a modified fire regime as a result of eucalypt forestation in Portugal, but the rising undermanaged and abandoned blue gum estate, especially after large-fire seasons, is a concern for the future. However, it remains to be determined whether post-fire eucalypt regrowth is a higher fire threat than native vegetation in the same context.This work was supported by FCT - Portuguese Foundation for Science and Technology, with national funds under project UID/AGR/04033/2019; as a post-doctoral grant to C. Rossa (SFRH/BPD/84770/2012) through financing programs POPH and FSE; and in the frame of project FIREXTR (PTDC/ATPGEO/0462/2014), co-financed by national funds and the European Regional Development Fund (ERDF) through the COMPETE 2020 - Operational Program Competitiveness and Internationalization.Elsevier2020-08-10T15:27:36Z2020-08-102019-05-20T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10174/28059http://hdl.handle.net/10174/28059https://doi.org/10.1016/j.scitotenv.2019.02.237porFernandes, P.M., Guiomar, N., Rossa, C.G. (2019). Analysing eucalypt expansion in Portugal as a fire-regime modifier. Science of the Total Environment, 666, 79-88.https://www.sciencedirect.com/science/article/pii/S0048969719307351ndnunogui@uevora.ptnd578Fernandes, P.M.Guiomar, N.Rossa, C.G.info:eu-repo/semantics/embargoedAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-03T19:23:57Zoai:dspace.uevora.pt:10174/28059Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:17:58.348923Repositório 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 |
Analysing eucalypt expansion in Portugal as a fire-regime modifier |
title |
Analysing eucalypt expansion in Portugal as a fire-regime modifier |
spellingShingle |
Analysing eucalypt expansion in Portugal as a fire-regime modifier Fernandes, P.M. Forest plantations Fire severity Land cover change Mediterranean climate Wildfire |
title_short |
Analysing eucalypt expansion in Portugal as a fire-regime modifier |
title_full |
Analysing eucalypt expansion in Portugal as a fire-regime modifier |
title_fullStr |
Analysing eucalypt expansion in Portugal as a fire-regime modifier |
title_full_unstemmed |
Analysing eucalypt expansion in Portugal as a fire-regime modifier |
title_sort |
Analysing eucalypt expansion in Portugal as a fire-regime modifier |
author |
Fernandes, P.M. |
author_facet |
Fernandes, P.M. Guiomar, N. Rossa, C.G. |
author_role |
author |
author2 |
Guiomar, N. Rossa, C.G. |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Fernandes, P.M. Guiomar, N. Rossa, C.G. |
dc.subject.por.fl_str_mv |
Forest plantations Fire severity Land cover change Mediterranean climate Wildfire |
topic |
Forest plantations Fire severity Land cover change Mediterranean climate Wildfire |
description |
Eucalypts, especially blue gum (Eucalyptus globulus), have been extensively planted in Portugal and nowadays dominate most of its forest landscapes. Large-scale forestation programs can intensify fire activity, and blue gum plantations are often viewed as highly flammable due to the nature and structure of the fuel complex. The role of eucalypt plantations in the fire regime of Mediterranean climate regions is increasingly debated following the recent catastrophic wildfires in Portugal and elsewhere. In this study we examined the effects of eucalypt forestation on burned area (BA), fire size, and fire severity in Portugal. This was based on fire and vegetation mapping and statistics, fire weather data, satellite imagery, and national forest inventory data. Eucalypt BA comprised an average of 12.5% of total BA (1980–2017) and did not increase over time and with eucalypt expansion. Eucalypt metrics did not explain interannual BA variability after accounting for the effects of other variables. Forest fires started within eucalypt stands were the least likely to become large, and large fire size was irresponsive to forest composition. Likewise, forest type was a generally minor influence in mega-fire severity and accounted for just 1.4–8.6% of surface fuel-hazard metrics variation. In general, large-scale conversion of maritime pine to eucalypt stands (1970–2015) implied lower fuel accumulation. Fire activity results are consistent with fuel hazard results and express trade-offs between short-rotation forestry and fire behaviour in blue gum stands, with high spotting potential versus modest crown fire likelihood. We found no support for the contention of a modified fire regime as a result of eucalypt forestation in Portugal, but the rising undermanaged and abandoned blue gum estate, especially after large-fire seasons, is a concern for the future. However, it remains to be determined whether post-fire eucalypt regrowth is a higher fire threat than native vegetation in the same context. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-05-20T00:00:00Z 2020-08-10T15:27:36Z 2020-08-10 |
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/10174/28059 http://hdl.handle.net/10174/28059 https://doi.org/10.1016/j.scitotenv.2019.02.237 |
url |
http://hdl.handle.net/10174/28059 https://doi.org/10.1016/j.scitotenv.2019.02.237 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
Fernandes, P.M., Guiomar, N., Rossa, C.G. (2019). Analysing eucalypt expansion in Portugal as a fire-regime modifier. Science of the Total Environment, 666, 79-88. https://www.sciencedirect.com/science/article/pii/S0048969719307351 nd nunogui@uevora.pt nd 578 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/embargoedAccess |
eu_rights_str_mv |
embargoedAccess |
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 |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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