Regeneraçao da Vegetaçao após o fogo em Portugal-Implicaçoes para a Gestao
This thesis aims at improving the knowledge on the post-fire vegetation regeneration. For that, forests and shrublands were studied, after forest fires and experimental fires. Maritime Pine (Pinus pinaster) recruitment after fire was studied. Fire severity was evidenced as a major effect on this pro...
| Autor: | |
|---|---|
| Tipo de documento: | tese |
| Data de publicação: | 2014 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositório: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/141270 |
| Acesso em linha: | http://hdl.handle.net/10261/141270 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Seeders Post-fire management Seed bank Fire severity Resprouters Forest fires Pinus pinaster Heathlands Erica australis Erica umbellata Pterospartum tridentatum |
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| dc.title.none.fl_str_mv |
Regeneraçao da Vegetaçao após o fogo em Portugal-Implicaçoes para a Gestao |
| title |
Regeneraçao da Vegetaçao após o fogo em Portugal-Implicaçoes para a Gestao |
| spellingShingle |
Regeneraçao da Vegetaçao após o fogo em Portugal-Implicaçoes para a Gestao Maia, Paula Seeders Post-fire management Seed bank Fire severity Resprouters Forest fires Pinus pinaster Heathlands Erica australis Erica umbellata Pterospartum tridentatum |
| title_short |
Regeneraçao da Vegetaçao após o fogo em Portugal-Implicaçoes para a Gestao |
| title_full |
Regeneraçao da Vegetaçao após o fogo em Portugal-Implicaçoes para a Gestao |
| title_fullStr |
Regeneraçao da Vegetaçao após o fogo em Portugal-Implicaçoes para a Gestao |
| title_full_unstemmed |
Regeneraçao da Vegetaçao após o fogo em Portugal-Implicaçoes para a Gestao |
| title_sort |
Regeneraçao da Vegetaçao após o fogo em Portugal-Implicaçoes para a Gestao |
| dc.creator.none.fl_str_mv |
Maia, Paula |
| author |
Maia, Paula |
| author_facet |
Maia, Paula |
| author_role |
author |
| dc.contributor.none.fl_str_mv |
Pausas, J. G. Fundação para a Ciência e a Tecnologia (Portugal) European Commission Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72] |
| dc.subject.none.fl_str_mv |
Seeders Post-fire management Seed bank Fire severity Resprouters Forest fires Pinus pinaster Heathlands Erica australis Erica umbellata Pterospartum tridentatum |
| topic |
Seeders Post-fire management Seed bank Fire severity Resprouters Forest fires Pinus pinaster Heathlands Erica australis Erica umbellata Pterospartum tridentatum |
| description |
This thesis aims at improving the knowledge on the post-fire vegetation regeneration. For that, forests and shrublands were studied, after forest fires and experimental fires. Maritime Pine (Pinus pinaster) recruitment after fire was studied. Fire severity was evidenced as a major effect on this process. High crown fire severity can combust the pines, destroying the seed bank and impeding post fire pine recruitment. However, crown combustion also influences the post-fire conditions on the soil surface, since high crown combustion (HCC) will decrease the postfire needle cast. After low crown combustion (LCC) (scorched rather than torched crowns), a considerable needle cover was observed, along with a higher density of pine seedlings. The overall trends of post-fire recruitment among LCC and HCC areas could be significantly attributed to cover by needles, as well by the estimation of fire severity using the diameters of the burned twigs (TSI). Fire increased the germination from the soil seed bank of a Pinus pinaster forest, and the effects were also related with fire severity. The densities of seedlings of the dominant taxa (genus Erica and Calluna vulgaris) were contrastingly affected in relation to the unburned situation, depending on fire severity, as estimated from the degree of fire-induced crown damage (LCC/HCC), as well as using a severity index based on the diameters of remaining twigs (TSI). Low severity patches had an increase in germination density relatively to the control, while high severity patches suffered a reduction. After an experimental fire in a heathland dominated by Pterospartum tridentatum, Erica australis and E. umbellata, no net differences in seedling emergence were observed, in relation to the pre-fire situation. However, rather than having no effect, the heterogeneity of temperatures caused by fire promoted caused divergent effects over the burned plot in terms of Erica australis germination – a progressive increased was observed in the plots were maximum temperature recorded ranged from 29 to 42.5ºC and decreased in plots with maximum temperature ranging from 51.5 to 74.5ºC. In this heathland, the seed density of two of the main species (E. australis and E. umbellata) was higher under their canopies, but the same was not true for P. tridentatum. The understory regeneration in pine and eucalypt stands, 5 to 6 years post fire, has been strongly associated with post-fire management practices. The effect of forest type was, comparatively, insignificant. Soil tilling, tree harvesting and shrub clearance, were linked to lower soil cover percentages. However, while all these management operations negatively affected the cover of resprouters, seeders were not affected by soil tilling. A strong influence of biogeographic region was identified, suggesting that more vulnerable regions may suffer higher effects of management, even under comparatively lower management pressure than more productive regions. This emphasizes the need to adequate post-fire management techniques to the target regions. |
| publishDate |
2014 |
| dc.date.none.fl_str_mv |
2014 2016 2016 2016 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/doctoralThesis http://purl.org/coar/resource_type/c_db06 |
| format |
doctoralThesis |
| dc.identifier.none.fl_str_mv |
http://hdl.handle.net/10261/141270 |
| url |
http://hdl.handle.net/10261/141270 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
Sí |
| dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess |
| eu_rights_str_mv |
openAccess |
| dc.publisher.none.fl_str_mv |
CSIC-GV-UV- Centro de Investigaciones sobre Desertificación (CIDE) Universidade de Aveiro |
| publisher.none.fl_str_mv |
CSIC-GV-UV- Centro de Investigaciones sobre Desertificación (CIDE) Universidade de Aveiro |
| dc.source.none.fl_str_mv |
reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC instname:Consejo Superior de Investigaciones Científicas (CSIC) |
| instname_str |
Consejo Superior de Investigaciones Científicas (CSIC) |
| reponame_str |
DIGITAL.CSIC. Repositorio Institucional del CSIC |
| collection |
DIGITAL.CSIC. Repositorio Institucional del CSIC |
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|
| repository.mail.fl_str_mv |
|
| _version_ |
1869415090656116736 |
| spelling |
Regeneraçao da Vegetaçao após o fogo em Portugal-Implicaçoes para a GestaoMaia, PaulaSeedersPost-fire managementSeed bankFire severityResproutersForest firesPinus pinasterHeathlandsErica australisErica umbellataPterospartum tridentatumThis thesis aims at improving the knowledge on the post-fire vegetation regeneration. For that, forests and shrublands were studied, after forest fires and experimental fires. Maritime Pine (Pinus pinaster) recruitment after fire was studied. Fire severity was evidenced as a major effect on this process. High crown fire severity can combust the pines, destroying the seed bank and impeding post fire pine recruitment. However, crown combustion also influences the post-fire conditions on the soil surface, since high crown combustion (HCC) will decrease the postfire needle cast. After low crown combustion (LCC) (scorched rather than torched crowns), a considerable needle cover was observed, along with a higher density of pine seedlings. The overall trends of post-fire recruitment among LCC and HCC areas could be significantly attributed to cover by needles, as well by the estimation of fire severity using the diameters of the burned twigs (TSI). Fire increased the germination from the soil seed bank of a Pinus pinaster forest, and the effects were also related with fire severity. The densities of seedlings of the dominant taxa (genus Erica and Calluna vulgaris) were contrastingly affected in relation to the unburned situation, depending on fire severity, as estimated from the degree of fire-induced crown damage (LCC/HCC), as well as using a severity index based on the diameters of remaining twigs (TSI). Low severity patches had an increase in germination density relatively to the control, while high severity patches suffered a reduction. After an experimental fire in a heathland dominated by Pterospartum tridentatum, Erica australis and E. umbellata, no net differences in seedling emergence were observed, in relation to the pre-fire situation. However, rather than having no effect, the heterogeneity of temperatures caused by fire promoted caused divergent effects over the burned plot in terms of Erica australis germination – a progressive increased was observed in the plots were maximum temperature recorded ranged from 29 to 42.5ºC and decreased in plots with maximum temperature ranging from 51.5 to 74.5ºC. In this heathland, the seed density of two of the main species (E. australis and E. umbellata) was higher under their canopies, but the same was not true for P. tridentatum. The understory regeneration in pine and eucalypt stands, 5 to 6 years post fire, has been strongly associated with post-fire management practices. The effect of forest type was, comparatively, insignificant. Soil tilling, tree harvesting and shrub clearance, were linked to lower soil cover percentages. However, while all these management operations negatively affected the cover of resprouters, seeders were not affected by soil tilling. A strong influence of biogeographic region was identified, suggesting that more vulnerable regions may suffer higher effects of management, even under comparatively lower management pressure than more productive regions. This emphasizes the need to adequate post-fire management techniques to the target regions.Tese desenvolvida no quadro do Programa Doutoral em Ciências e Engenharia do Ambiente, com o financiamento de uma bolsa de doutoramento (SFRH/BD/42168/2007) da Fundação para a Ciência e a Tecnologia (FCT) e o apoio dos projectos EROSFIRE II (PTDC/AGR-CFL/70968/2006), e ”FIREREG”(PTDC/AGR-CFL/099420/2008), ambos financiados pela Fundação para a Ciência e a Tecnologia (FCT) e o FSE no âmbito do III Quadro Comunitário de Apoio.Peer ReviewedCSIC-GV-UV- Centro de Investigaciones sobre Desertificación (CIDE)Universidade de AveiroPausas, J. G.Fundação para a Ciência e a Tecnologia (Portugal)European CommissionConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2016201620142016info:eu-repo/semantics/doctoralThesishttp://purl.org/coar/resource_type/c_db06http://hdl.handle.net/10261/141270reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1412702026-05-22T06:33:51Z |
| score |
15,811543 |