Density of Araucaria angustifolia wood from overstocked stand
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Pesquisa Florestal Brasileira (Online) |
Texto Completo: | https://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/963 |
Resumo: | The aim of this work was to evaluate the radial and longitudinal variations of wood specific gravity in an overstocked stand of Araucaria angustifolia, with 65 years. The stand was located in the National Forest of Açungui, Campo Largo, Parana State, Brazil, with thinning recorded between 1970 and 1980, without subsequent thinnings. We selected three trees for each diameter class: 10-30 cm, 30-50 cm and 50-70 cm. To the longitudinal analysis, we collected discs from seven heights (0, 20, 40, 60, 80 and 100% of commercial stem and at 1.3 m). The barks were removed and it was obtained opposite wedges until pith and five samples were taken in radial direction from each disk. In general, there was an increase of wood specific gravity in radial direction. The average differed significantly along the stem, with decreasing trend of wood specific gravity in the longitudinal direction. However, average specific gravity at 60% of commercial height was higher than at 40%, than reducing to the top, indicating effect of competition that occurred in the area. The no uniform wood along stem indicates negative effects of the lack of management in the stand. |
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Density of Araucaria angustifolia wood from overstocked standMassa específica básica da madeira de Araucaria angustifolia em povoamento superestocadoQuality of woodRadial and longitudinal variationsCompetitionQualidade da madeiraVariações radial e longitudinalCompetiçãoThe aim of this work was to evaluate the radial and longitudinal variations of wood specific gravity in an overstocked stand of Araucaria angustifolia, with 65 years. The stand was located in the National Forest of Açungui, Campo Largo, Parana State, Brazil, with thinning recorded between 1970 and 1980, without subsequent thinnings. We selected three trees for each diameter class: 10-30 cm, 30-50 cm and 50-70 cm. To the longitudinal analysis, we collected discs from seven heights (0, 20, 40, 60, 80 and 100% of commercial stem and at 1.3 m). The barks were removed and it was obtained opposite wedges until pith and five samples were taken in radial direction from each disk. In general, there was an increase of wood specific gravity in radial direction. The average differed significantly along the stem, with decreasing trend of wood specific gravity in the longitudinal direction. However, average specific gravity at 60% of commercial height was higher than at 40%, than reducing to the top, indicating effect of competition that occurred in the area. The no uniform wood along stem indicates negative effects of the lack of management in the stand.O objetivo do presente trabalho foi avaliar as variações radiais e longitudinais de massa específica básica da madeira em um plantio superestocado com 65 anos de Araucaria angustifolia. O plantio, localizado na Floresta Nacional de Açungui, Campo Largo, PR, foi desbastado entre 1970 e 1980, não havendo registros de desbastes posteriores a essa data. Foram selecionadas três árvores para cada classe de diâmetro: 10-30 cm, 30-50 cm e 50-70 cm. Para a análise longitudinal, foram seccionados discos em sete alturas (0, 20, 40, 60, 80 e 100% da altura comercial e a 1,3 m do solo), sendo removidas as cascas e retiradas duas cunhas opostas até a medula e cinco corpos de prova no sentido radial de cada disco. Em geral, na direção radial houve aumento da massa específica. As médias da massa específica diferiram estatisticamente ao longo do fuste, com diminuição da massa específica na direção longitudinal. No entanto, a massa específica média a 60% da altura comercial foi maior do que a 40%, com redução a partir dessa altura em direção ao topo, indicando efeito da competição que ocorreu na área. A desuniformidade da madeira ao longo do fuste é um indicativo dos efeitos negativos da falta de manejo na área.Embrapa Florestas2021-11-17info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/96310.4336/2016.pfb.36.85.963Pesquisa Florestal Brasileira; v. 36 n. 85 (2016): jan./mar.; 51-59Pesquisa Florestal Brasileira; Vol. 36 No. 85 (2016): jan./mar.; 51-591983-26051809-3647reponame:Pesquisa Florestal Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAenghttps://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/963/469Copyright (c) 2016 Rafaella De Angeli Curto, Patricia Póvoa de Mattos, Evaldo Muñoz Braz, Sylvio Pellico Netto, Randolf Zachowhttps://creativecommons.org/licenses/by-nc-nd/4.0info:eu-repo/semantics/openAccessCurto, Rafaella De AngeliMattos, Patricia Póvoa deBraz, Evaldo MuñozNetto, Sylvio PellicoZachow, Randolf2021-11-17T13:34:26Zoai:pfb.cnpf.embrapa.br/pfb:article/963Revistahttps://pfb.cnpf.embrapa.br/pfb/index.php/pfb/PUBhttps://pfb.cnpf.embrapa.br/pfb/index.php/pfb/oaipfb@embrapa.br || revista.pfb@gmail.com || patricia.mattos@embrapa.br1983-26051809-3647opendoar:2021-11-17T13:34:26Pesquisa Florestal Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Density of Araucaria angustifolia wood from overstocked stand Massa específica básica da madeira de Araucaria angustifolia em povoamento superestocado |
title |
Density of Araucaria angustifolia wood from overstocked stand |
spellingShingle |
Density of Araucaria angustifolia wood from overstocked stand Curto, Rafaella De Angeli Quality of wood Radial and longitudinal variations Competition Qualidade da madeira Variações radial e longitudinal Competição |
title_short |
Density of Araucaria angustifolia wood from overstocked stand |
title_full |
Density of Araucaria angustifolia wood from overstocked stand |
title_fullStr |
Density of Araucaria angustifolia wood from overstocked stand |
title_full_unstemmed |
Density of Araucaria angustifolia wood from overstocked stand |
title_sort |
Density of Araucaria angustifolia wood from overstocked stand |
author |
Curto, Rafaella De Angeli |
author_facet |
Curto, Rafaella De Angeli Mattos, Patricia Póvoa de Braz, Evaldo Muñoz Netto, Sylvio Pellico Zachow, Randolf |
author_role |
author |
author2 |
Mattos, Patricia Póvoa de Braz, Evaldo Muñoz Netto, Sylvio Pellico Zachow, Randolf |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Curto, Rafaella De Angeli Mattos, Patricia Póvoa de Braz, Evaldo Muñoz Netto, Sylvio Pellico Zachow, Randolf |
dc.subject.por.fl_str_mv |
Quality of wood Radial and longitudinal variations Competition Qualidade da madeira Variações radial e longitudinal Competição |
topic |
Quality of wood Radial and longitudinal variations Competition Qualidade da madeira Variações radial e longitudinal Competição |
description |
The aim of this work was to evaluate the radial and longitudinal variations of wood specific gravity in an overstocked stand of Araucaria angustifolia, with 65 years. The stand was located in the National Forest of Açungui, Campo Largo, Parana State, Brazil, with thinning recorded between 1970 and 1980, without subsequent thinnings. We selected three trees for each diameter class: 10-30 cm, 30-50 cm and 50-70 cm. To the longitudinal analysis, we collected discs from seven heights (0, 20, 40, 60, 80 and 100% of commercial stem and at 1.3 m). The barks were removed and it was obtained opposite wedges until pith and five samples were taken in radial direction from each disk. In general, there was an increase of wood specific gravity in radial direction. The average differed significantly along the stem, with decreasing trend of wood specific gravity in the longitudinal direction. However, average specific gravity at 60% of commercial height was higher than at 40%, than reducing to the top, indicating effect of competition that occurred in the area. The no uniform wood along stem indicates negative effects of the lack of management in the stand. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-11-17 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/963 10.4336/2016.pfb.36.85.963 |
url |
https://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/963 |
identifier_str_mv |
10.4336/2016.pfb.36.85.963 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/963/469 |
dc.rights.driver.fl_str_mv |
https://creativecommons.org/licenses/by-nc-nd/4.0 info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-nd/4.0 |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Embrapa Florestas |
publisher.none.fl_str_mv |
Embrapa Florestas |
dc.source.none.fl_str_mv |
Pesquisa Florestal Brasileira; v. 36 n. 85 (2016): jan./mar.; 51-59 Pesquisa Florestal Brasileira; Vol. 36 No. 85 (2016): jan./mar.; 51-59 1983-2605 1809-3647 reponame:Pesquisa Florestal Brasileira (Online) instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA |
instname_str |
Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
instacron_str |
EMBRAPA |
institution |
EMBRAPA |
reponame_str |
Pesquisa Florestal Brasileira (Online) |
collection |
Pesquisa Florestal Brasileira (Online) |
repository.name.fl_str_mv |
Pesquisa Florestal Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
repository.mail.fl_str_mv |
pfb@embrapa.br || revista.pfb@gmail.com || patricia.mattos@embrapa.br |
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1783370935337746432 |