From seed to sapling: effects of plant community, soil cover and fire in the recruitment and establishment of maritime pine
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10773/33552 |
Resumo: | Pinus pinaster forests are among the most affected forests by fire in the Mediterranean. The main objective of this dissertation was to study the natural dynamics of P. pinaster natural regeneration in a post-fire scenario in three populations of central coastal Portugal, that affected by the 2017 fires (our treatment). For this, 18 sampling points with two replicas, areas of 50m2 were sampled, in which forest stands and understory vegetation structures were characterized. The density of P. pinaster regeneration was assessed in four sub-plots of 1m2 in each treatment and population. ANOVAs were performed to verify differences between populations and treatments. Correlations between maritime pine regeneration and the study variables: biotic (stand, soil cover and plant cover) and abiotic (topography and climate), were tested by calculating Spearman correlations. Regeneration values considered sustainable were recorded in all three populations for the two treatments, where only Mira showed signs of establishment difficulty due to low survival rates. Older stands, with higher biomass productions, show a negative relationship with survival and height of regeneration. High levels of invasion were recorded which showed a negative relationship with regeneration density and survival. The height of the invasive cover demonstrated to be negative for survival, thus demonstrating in both cases relations of competition. The opposite effect was verified for the cover of native flora where positive relations were registered with survival and height of regeneration, thus demonstrating relations of facilitation with regeneration. |
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From seed to sapling: effects of plant community, soil cover and fire in the recruitment and establishment of maritime pinePinus pinasterNatural regenerationFireCompetitionFacilitationPinus pinaster forests are among the most affected forests by fire in the Mediterranean. The main objective of this dissertation was to study the natural dynamics of P. pinaster natural regeneration in a post-fire scenario in three populations of central coastal Portugal, that affected by the 2017 fires (our treatment). For this, 18 sampling points with two replicas, areas of 50m2 were sampled, in which forest stands and understory vegetation structures were characterized. The density of P. pinaster regeneration was assessed in four sub-plots of 1m2 in each treatment and population. ANOVAs were performed to verify differences between populations and treatments. Correlations between maritime pine regeneration and the study variables: biotic (stand, soil cover and plant cover) and abiotic (topography and climate), were tested by calculating Spearman correlations. Regeneration values considered sustainable were recorded in all three populations for the two treatments, where only Mira showed signs of establishment difficulty due to low survival rates. Older stands, with higher biomass productions, show a negative relationship with survival and height of regeneration. High levels of invasion were recorded which showed a negative relationship with regeneration density and survival. The height of the invasive cover demonstrated to be negative for survival, thus demonstrating in both cases relations of competition. The opposite effect was verified for the cover of native flora where positive relations were registered with survival and height of regeneration, thus demonstrating relations of facilitation with regeneration.As florestas de Pinus pinaster estão entre as florestas mais afetadas pelo fogo no Mediterrâneo. O principal objetivo desta dissertação foi estudar a dinâmica natural da regeneração natural do P. pinaster em cenário de pós-fogo em três populações do centro costeiro de Portugal, afetadas pelos fogos de 2017. Para isto foram amostrados 18 pontos de amostragem, com duas réplicas cada de áreas de 50m2, nas quais foram caracterizados os povoamentos florestais e as estruturas da vegetação de sub-coberto. A densidade da regeneração de pinheiro-bravo foi avaliada em quatro sub-parcelas de 1m2 em cada tratamento e população. Foram realizadas ANOVAS para verificar as diferenças entre populações e tratamentos. As correlações entre a regeneração de pinheiro-bravo e as variáveis: bióticas (povoamento, cobertura de solo, coberto vegetal) e abióticas (topografia e clima) foram testadas através do cálculo de correlações de Spearman. Foram registados valores de regeneração considerados sustentáveis nas três populações para os dois tratamentos, onde apenas Mira mostrou indícios de dificuldade de estabelecimento devido às baixas taxas de sobrevivência. Povoamentos mais antigos, com maiores produções de biomassa mostram uma relação negativa com a sobrevivência e altura da regeneração. Foram registados altos níveis de invasão que demonstraram uma relação negativa com a densidade e sobrevivência da regeneração. A altura do coberto invasor demonstrou ser negativa para a sobrevivência, demonstrando assim nos dois casos relações de competição. Verificou-se o efeito contrário relativamente á cobertura de flora nativa onde se registaram relações positivas com a sobrevivência e altura da regeneração demonstrando assim relações de facilitação com a regeneração.2022-03-24T10:58:06Z2021-12-15T00:00:00Z2021-12-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10773/33552engRodrigues, Diana Manuela Antunesinfo: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:RCAAP2023-07-17T04:13:16ZPortal AgregadorONG |
dc.title.none.fl_str_mv |
From seed to sapling: effects of plant community, soil cover and fire in the recruitment and establishment of maritime pine |
title |
From seed to sapling: effects of plant community, soil cover and fire in the recruitment and establishment of maritime pine |
spellingShingle |
From seed to sapling: effects of plant community, soil cover and fire in the recruitment and establishment of maritime pine Rodrigues, Diana Manuela Antunes Pinus pinaster Natural regeneration Fire Competition Facilitation |
title_short |
From seed to sapling: effects of plant community, soil cover and fire in the recruitment and establishment of maritime pine |
title_full |
From seed to sapling: effects of plant community, soil cover and fire in the recruitment and establishment of maritime pine |
title_fullStr |
From seed to sapling: effects of plant community, soil cover and fire in the recruitment and establishment of maritime pine |
title_full_unstemmed |
From seed to sapling: effects of plant community, soil cover and fire in the recruitment and establishment of maritime pine |
title_sort |
From seed to sapling: effects of plant community, soil cover and fire in the recruitment and establishment of maritime pine |
author |
Rodrigues, Diana Manuela Antunes |
author_facet |
Rodrigues, Diana Manuela Antunes |
author_role |
author |
dc.contributor.author.fl_str_mv |
Rodrigues, Diana Manuela Antunes |
dc.subject.por.fl_str_mv |
Pinus pinaster Natural regeneration Fire Competition Facilitation |
topic |
Pinus pinaster Natural regeneration Fire Competition Facilitation |
description |
Pinus pinaster forests are among the most affected forests by fire in the Mediterranean. The main objective of this dissertation was to study the natural dynamics of P. pinaster natural regeneration in a post-fire scenario in three populations of central coastal Portugal, that affected by the 2017 fires (our treatment). For this, 18 sampling points with two replicas, areas of 50m2 were sampled, in which forest stands and understory vegetation structures were characterized. The density of P. pinaster regeneration was assessed in four sub-plots of 1m2 in each treatment and population. ANOVAs were performed to verify differences between populations and treatments. Correlations between maritime pine regeneration and the study variables: biotic (stand, soil cover and plant cover) and abiotic (topography and climate), were tested by calculating Spearman correlations. Regeneration values considered sustainable were recorded in all three populations for the two treatments, where only Mira showed signs of establishment difficulty due to low survival rates. Older stands, with higher biomass productions, show a negative relationship with survival and height of regeneration. High levels of invasion were recorded which showed a negative relationship with regeneration density and survival. The height of the invasive cover demonstrated to be negative for survival, thus demonstrating in both cases relations of competition. The opposite effect was verified for the cover of native flora where positive relations were registered with survival and height of regeneration, thus demonstrating relations of facilitation with regeneration. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-12-15T00:00:00Z 2021-12-15 2022-03-24T10:58:06Z |
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/10773/33552 |
url |
http://hdl.handle.net/10773/33552 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
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.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 |
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repository.mail.fl_str_mv |
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_version_ |
1777303581978787840 |