Heartwood and sapwood variation in Acacia melanoxylon R. Br. trees in Portugal

Detalhes bibliográficos
Autor(a) principal: Knapic, Sofia
Data de Publicação: 2006
Outros Autores: Tavares, Fátima, Pereira, Helena
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.5/17434
Resumo: The development of heartwood and sapwood in blackwood ( Acacia melanoxylon R. Br.) was studied in a total of 20 trees with a 40-cm-diameter class sampled over four stands in northern Portugal at harvest for timber production. Stem discs with 5-cm thickness were taken at different height levels (stem base and 5, 15, 35, 50, 65, 75, 85 and 90 per cent of total height). Crosssectional area and heartwood area were measured by image analysis. Heartwood represented a substantial part of the trees and within the tree it attained on average 81 per cent of total height, and represented 69, 62, 58 and 44 per cent of the stem cross-sectional area, respectively, at 5, 35, 50 and 65 per cent of total tree height. The heartwood followed closely the stem wood profi le both axially and radially. Estimation of heartwood dimensions from external wood diameters (either over or under bark) was possible using a linear model, which had a very high correlation coeffi cient ( R 2 = 0.97). The sapwood radial width showed a very small variation within and between trees and maintained a constant value of 31 mm up to ∼ 65 per cent of tree height. No site infl uence was found for the heartwood development and the between-tree variation was small. The species and the sampled individuals in Portugal showed potential for the diversifi cation of forest production and increasing the industrial supply of a valuable timber hardwood
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spelling Heartwood and sapwood variation in Acacia melanoxylon R. Br. trees in PortugalheartwoodsapwoodAcacia melanoxylonPortugalThe development of heartwood and sapwood in blackwood ( Acacia melanoxylon R. Br.) was studied in a total of 20 trees with a 40-cm-diameter class sampled over four stands in northern Portugal at harvest for timber production. Stem discs with 5-cm thickness were taken at different height levels (stem base and 5, 15, 35, 50, 65, 75, 85 and 90 per cent of total height). Crosssectional area and heartwood area were measured by image analysis. Heartwood represented a substantial part of the trees and within the tree it attained on average 81 per cent of total height, and represented 69, 62, 58 and 44 per cent of the stem cross-sectional area, respectively, at 5, 35, 50 and 65 per cent of total tree height. The heartwood followed closely the stem wood profi le both axially and radially. Estimation of heartwood dimensions from external wood diameters (either over or under bark) was possible using a linear model, which had a very high correlation coeffi cient ( R 2 = 0.97). The sapwood radial width showed a very small variation within and between trees and maintained a constant value of 31 mm up to ∼ 65 per cent of tree height. No site infl uence was found for the heartwood development and the between-tree variation was small. The species and the sampled individuals in Portugal showed potential for the diversifi cation of forest production and increasing the industrial supply of a valuable timber hardwoodInstitute of Chartered ForestersRepositório da Universidade de LisboaKnapic, SofiaTavares, FátimaPereira, Helena2019-02-25T11:59:19Z20062006-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.5/17434engForestry, Vol. 79, No. 4, 2006, p. 371-380doi:10.1093/forestry/cpl010info: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:RCAAP2024-11-20T19:03:49Zoai:repositorio.ul.pt:10400.5/17434Portal AgregadorONGhttps://www.rcaap.pt/oai/openairemluisa.alvim@gmail.comopendoar:71602024-11-20T19:03:49Repositório 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 Heartwood and sapwood variation in Acacia melanoxylon R. Br. trees in Portugal
title Heartwood and sapwood variation in Acacia melanoxylon R. Br. trees in Portugal
spellingShingle Heartwood and sapwood variation in Acacia melanoxylon R. Br. trees in Portugal
Knapic, Sofia
heartwood
sapwood
Acacia melanoxylon
Portugal
title_short Heartwood and sapwood variation in Acacia melanoxylon R. Br. trees in Portugal
title_full Heartwood and sapwood variation in Acacia melanoxylon R. Br. trees in Portugal
title_fullStr Heartwood and sapwood variation in Acacia melanoxylon R. Br. trees in Portugal
title_full_unstemmed Heartwood and sapwood variation in Acacia melanoxylon R. Br. trees in Portugal
title_sort Heartwood and sapwood variation in Acacia melanoxylon R. Br. trees in Portugal
author Knapic, Sofia
author_facet Knapic, Sofia
Tavares, Fátima
Pereira, Helena
author_role author
author2 Tavares, Fátima
Pereira, Helena
author2_role author
author
dc.contributor.none.fl_str_mv Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Knapic, Sofia
Tavares, Fátima
Pereira, Helena
dc.subject.por.fl_str_mv heartwood
sapwood
Acacia melanoxylon
Portugal
topic heartwood
sapwood
Acacia melanoxylon
Portugal
description The development of heartwood and sapwood in blackwood ( Acacia melanoxylon R. Br.) was studied in a total of 20 trees with a 40-cm-diameter class sampled over four stands in northern Portugal at harvest for timber production. Stem discs with 5-cm thickness were taken at different height levels (stem base and 5, 15, 35, 50, 65, 75, 85 and 90 per cent of total height). Crosssectional area and heartwood area were measured by image analysis. Heartwood represented a substantial part of the trees and within the tree it attained on average 81 per cent of total height, and represented 69, 62, 58 and 44 per cent of the stem cross-sectional area, respectively, at 5, 35, 50 and 65 per cent of total tree height. The heartwood followed closely the stem wood profi le both axially and radially. Estimation of heartwood dimensions from external wood diameters (either over or under bark) was possible using a linear model, which had a very high correlation coeffi cient ( R 2 = 0.97). The sapwood radial width showed a very small variation within and between trees and maintained a constant value of 31 mm up to ∼ 65 per cent of tree height. No site infl uence was found for the heartwood development and the between-tree variation was small. The species and the sampled individuals in Portugal showed potential for the diversifi cation of forest production and increasing the industrial supply of a valuable timber hardwood
publishDate 2006
dc.date.none.fl_str_mv 2006
2006-01-01T00:00:00Z
2019-02-25T11:59:19Z
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/10400.5/17434
url http://hdl.handle.net/10400.5/17434
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Forestry, Vol. 79, No. 4, 2006, p. 371-380
doi:10.1093/forestry/cpl010
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 Institute of Chartered Foresters
publisher.none.fl_str_mv Institute of Chartered Foresters
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 mluisa.alvim@gmail.com
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