Assessing the role of macro- and microclimate on Holm oak performance in Mediterranean drylands

Detalhes bibliográficos
Autor(a) principal: Serafim, João Afonso Machado Pinto de Aguiar
Data de Publicação: 2019
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.5/21285
Resumo: Mestrado em Biologia dos Recursos Vegetais / Instituto Superior de Agronomia / Faculdade de Ciências. Universidade de Lisboa
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spelling Assessing the role of macro- and microclimate on Holm oak performance in Mediterranean drylandsafforestationclimate changeQuercus ilexseedling survivalseed provenanceMestrado em Biologia dos Recursos Vegetais / Instituto Superior de Agronomia / Faculdade de Ciências. Universidade de LisboaMediterranean drylands are expected to become drier due to climate change. This may aggravate desertification by increasing dryland susceptibility to land degradation, leading to the loss of biodiversity and ability to provide ecosystem services. In Mediterranean Basin drylands, a large area is occupied by oak woodlands, a semi-natural agro-silvopastoral system called Montado in Portugal. In the drier areas, where Montado seems to act as a buffer against desertification, the dominant tree species is Holm oak (Quercus ilex subsp. rotundifolia), However, in the last decades, a declining trend has been reported for Holm oak woodlands, mostly attributed to unsustainable land management, biotic factors and to an increase in aridity at a regional scale. Also, at a local scale, it has been shown that microclimate conditions driven by topography have a major influence on this species natural regeneration rates. Over the last decades, many (re)afforestation with Holm oak have been implemented to revert Montado’s decline and combat desertification, although not always successful. The aim of this work was to study the effect of macro- and microclimate on Holm oak performance, specifically on acorn germination and first summer seedling survival. Holm oak acorns were collected along a climatic gradient based on long-term precipitation (30 yrs.), resulting in 6 macroclimate provenances. In 2 sites, the driest and the wettest sites of the gradient, areas with contrasting microclimates were selected using Potential Solar Radiation (PSR) as a proxy of microclimate conditions. Holm oak performance was, thus, studied along a macroclimate gradient and in microclimate contrasting conditions. Holm oak acorns from each provenance where characterized biometrically and acorn production evaluated. Germination of acorns and seedling survival were evaluated under greenhouse similar conditions and in the field under contrasting macro- and microclimate conditions. We found that macro- and microclimatic provenance influences acorn size and germination. Drier sites and more exposed areas (higher PSR) had bigger acorns with higher germination. Field conditions did not seem to affect germination but rather the first summer seedling survival. The survival of Holm oak seedlings to the first summer was significantly higher in the wetter site and in less exposed areas than in the drier site and in more exposed areas. This work provides guidelines to increase Holm oak seedling quantity and quality in nurseries to be used in (re)afforestation plans and to improve Holm oak young seedling survival, either by focusing (re)afforestation in microclimatic favorable areas (using remote sensing derived information like PSR), or by providing additional assistance to seedlings growing in drier and/or more exposed areas. In addition, it may also help to better understand Holm oak seedling mortality and/or natural regeneration patterns. Hence, these findings may contribute to improve the success of Holm oak (re)afforestation as a critical restoration tool to combat desertification in Portuguese drylands, and revert Holm oak Montado’s decline, particularly under a climate change scenarioISACorreia, OtíliaNunes, AliceRepositório da Universidade de LisboaSerafim, João Afonso Machado Pinto de Aguiar2021-05-13T10:23:41Z20192019-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10400.5/21285TID:203085361engSerafim, J.A.M.P.A. - Assessing the role of macro- and microclimate on Holm oak performance in Mediterranean drylands. Lisboa: ISA, 2019, 61 p.info: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:RCAAP2023-03-06T14:50:43Zoai:www.repository.utl.pt:10400.5/21285Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T17:05:54.011022Repositório 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 Assessing the role of macro- and microclimate on Holm oak performance in Mediterranean drylands
title Assessing the role of macro- and microclimate on Holm oak performance in Mediterranean drylands
spellingShingle Assessing the role of macro- and microclimate on Holm oak performance in Mediterranean drylands
Serafim, João Afonso Machado Pinto de Aguiar
afforestation
climate change
Quercus ilex
seedling survival
seed provenance
title_short Assessing the role of macro- and microclimate on Holm oak performance in Mediterranean drylands
title_full Assessing the role of macro- and microclimate on Holm oak performance in Mediterranean drylands
title_fullStr Assessing the role of macro- and microclimate on Holm oak performance in Mediterranean drylands
title_full_unstemmed Assessing the role of macro- and microclimate on Holm oak performance in Mediterranean drylands
title_sort Assessing the role of macro- and microclimate on Holm oak performance in Mediterranean drylands
author Serafim, João Afonso Machado Pinto de Aguiar
author_facet Serafim, João Afonso Machado Pinto de Aguiar
author_role author
dc.contributor.none.fl_str_mv Correia, Otília
Nunes, Alice
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Serafim, João Afonso Machado Pinto de Aguiar
dc.subject.por.fl_str_mv afforestation
climate change
Quercus ilex
seedling survival
seed provenance
topic afforestation
climate change
Quercus ilex
seedling survival
seed provenance
description Mestrado em Biologia dos Recursos Vegetais / Instituto Superior de Agronomia / Faculdade de Ciências. Universidade de Lisboa
publishDate 2019
dc.date.none.fl_str_mv 2019
2019-01-01T00:00:00Z
2021-05-13T10:23:41Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.5/21285
TID:203085361
url http://hdl.handle.net/10400.5/21285
identifier_str_mv TID:203085361
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Serafim, J.A.M.P.A. - Assessing the role of macro- and microclimate on Holm oak performance in Mediterranean drylands. Lisboa: ISA, 2019, 61 p.
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 ISA
publisher.none.fl_str_mv ISA
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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