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Biblioteca(s): |
Embrapa Amazônia Oriental. |
Data corrente: |
21/06/2022 |
Data da última atualização: |
21/06/2022 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
SILVA, U. S. da C.; RUSCHEL, A. R.; REIS, I. M. S. |
Afiliação: |
ULISSES SIDNEI DA CONCEIÇÃO SILVA, UFRA / UFOPA; ADEMIR ROBERTO RUSCHEL, CPATU; IOLANDA MARIA SOARES REIS, UFOPA. |
Título: |
Factors influencing directional tree felling in the Tapajós National Forest, Amazon, Brazil. |
Ano de publicação: |
2022 |
Fonte/Imprenta: |
Journal of Agricultural Science, v. 14, n. 7, p. 83-105, 2022. |
DOI: |
https://doi.org/10.5539/jas.v14n7p83 |
Idioma: |
Inglês |
Conteúdo: |
Given its complexity, directional felling is considered one of the most dangerous activities in the exploratory phase of forest management projects for timber obtention. Therefore, detailed studies of the variables influencing its execution are necessary. The present research was conducted in the Tapajós National Forest, Brazilian Amazon, and analyzed 1,075 trees logged using the directional felling technique in a 504.30 ha area. To better understand directional felling, the studied variables were subjected to descriptive analyses and principal component analysis, a multivariate procedure that enables the simultaneous evaluation of several variables. While the diameter, basal area, and stem and branch volume explained most of the variability concerning directional felling, the commercial height influenced the least. Trees of the species Hymenolobium petraeum (angelim pedra) strongly correlated with the dendrometric variables diameter and stem and branch volume. Those of the species Hymenaea courbaril (jatobá) showed a strong correlation with the commercial height. Pseudopiptadenia psilostachya (fava timborana), Dipteryx odorata (cumaru), Hymenaea parvifolia (jutai mirim), and Astronium lecointei (muiracatiara) had a strong correlation with the basic wood density. Trees of the species Couratari guianensis (tauari), Lecythis pisonis (sapucaia), Astronium lecointei (muiracatiara), Mezilaurus itauba (itaúba), and Goupia glabra (cupiúba) showed lower correlations with the time needed for planning, cutting, and felling. They also had a reduced correlation with the angular differences between the natural and effective and the intended and effective felling directions. The latter results suggest that these species do not follow a defined pattern concerning the directional felling technique. However, trees of the other species followed a different tendency. In general, the logged trees lacked correlation with the directional felling cutting and total operation time. The analyses suggest that as the diameter of a tree increases, the chances of completing its directional felling decrease. MenosGiven its complexity, directional felling is considered one of the most dangerous activities in the exploratory phase of forest management projects for timber obtention. Therefore, detailed studies of the variables influencing its execution are necessary. The present research was conducted in the Tapajós National Forest, Brazilian Amazon, and analyzed 1,075 trees logged using the directional felling technique in a 504.30 ha area. To better understand directional felling, the studied variables were subjected to descriptive analyses and principal component analysis, a multivariate procedure that enables the simultaneous evaluation of several variables. While the diameter, basal area, and stem and branch volume explained most of the variability concerning directional felling, the commercial height influenced the least. Trees of the species Hymenolobium petraeum (angelim pedra) strongly correlated with the dendrometric variables diameter and stem and branch volume. Those of the species Hymenaea courbaril (jatobá) showed a strong correlation with the commercial height. Pseudopiptadenia psilostachya (fava timborana), Dipteryx odorata (cumaru), Hymenaea parvifolia (jutai mirim), and Astronium lecointei (muiracatiara) had a strong correlation with the basic wood density. Trees of the species Couratari guianensis (tauari), Lecythis pisonis (sapucaia), Astronium lecointei (muiracatiara), Mezilaurus itauba (itaúba), and Goupia glabra (cupiúba) showed lower correlations with the time ne... Mostrar Tudo |
Palavras-Chave: |
Chainsaw operator; Dendrometric variables; Directional felling; Natural fall; Reduced impact logging. |
Thesagro: |
Árvore; Árvore Florestal; Corte; Extração da Madeira. |
Thesaurus Nal: |
Principal component analysis. |
Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1144185/1/FactorsInfluencingDirectional.pdf
|
Marc: |
LEADER 02985naa a2200277 a 4500 001 2144185 005 2022-06-21 008 2022 bl uuuu u00u1 u #d 024 7 $ahttps://doi.org/10.5539/jas.v14n7p83$2DOI 100 1 $aSILVA, U. S. da C. 245 $aFactors influencing directional tree felling in the Tapajós National Forest, Amazon, Brazil.$h[electronic resource] 260 $c2022 520 $aGiven its complexity, directional felling is considered one of the most dangerous activities in the exploratory phase of forest management projects for timber obtention. Therefore, detailed studies of the variables influencing its execution are necessary. The present research was conducted in the Tapajós National Forest, Brazilian Amazon, and analyzed 1,075 trees logged using the directional felling technique in a 504.30 ha area. To better understand directional felling, the studied variables were subjected to descriptive analyses and principal component analysis, a multivariate procedure that enables the simultaneous evaluation of several variables. While the diameter, basal area, and stem and branch volume explained most of the variability concerning directional felling, the commercial height influenced the least. Trees of the species Hymenolobium petraeum (angelim pedra) strongly correlated with the dendrometric variables diameter and stem and branch volume. Those of the species Hymenaea courbaril (jatobá) showed a strong correlation with the commercial height. Pseudopiptadenia psilostachya (fava timborana), Dipteryx odorata (cumaru), Hymenaea parvifolia (jutai mirim), and Astronium lecointei (muiracatiara) had a strong correlation with the basic wood density. Trees of the species Couratari guianensis (tauari), Lecythis pisonis (sapucaia), Astronium lecointei (muiracatiara), Mezilaurus itauba (itaúba), and Goupia glabra (cupiúba) showed lower correlations with the time needed for planning, cutting, and felling. They also had a reduced correlation with the angular differences between the natural and effective and the intended and effective felling directions. The latter results suggest that these species do not follow a defined pattern concerning the directional felling technique. However, trees of the other species followed a different tendency. In general, the logged trees lacked correlation with the directional felling cutting and total operation time. The analyses suggest that as the diameter of a tree increases, the chances of completing its directional felling decrease. 650 $aPrincipal component analysis 650 $aÁrvore 650 $aÁrvore Florestal 650 $aCorte 650 $aExtração da Madeira 653 $aChainsaw operator 653 $aDendrometric variables 653 $aDirectional felling 653 $aNatural fall 653 $aReduced impact logging 700 1 $aRUSCHEL, A. R. 700 1 $aREIS, I. M. S. 773 $tJournal of Agricultural Science$gv. 14, n. 7, p. 83-105, 2022.
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Embrapa Amazônia Oriental (CPATU) |
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Registro Completo
Biblioteca(s): |
Embrapa Recursos Genéticos e Biotecnologia. |
Data corrente: |
08/12/2005 |
Data da última atualização: |
08/02/2012 |
Autoria: |
BUSTAMANTE, P. G.; PÁDUA, V. L. M.; MAIA, V. H.; FRANÇA, L. M.; FERREIRA, P. C. G. |
Título: |
Maize (Zea mays L.) dispersion and human migration in the South America: linking biological and archaeological foccus. |
Ano de publicação: |
2005 |
Fonte/Imprenta: |
In: SIMPOSIO DE RECURSOS GENÉTICOS PARA AMÉRICA LATINA Y EL CARIBE, SIRGEALC, 5., 2005, Montevideo, Uruguay. Resúmenes... Montevideo: Instituto Nacional de Investigación Agropecuaria: Universidad de la República, Facultad de Agronomía, 2005. |
Páginas: |
p. 44. |
Idioma: |
Inglês |
Palavras-Chave: |
América do Sul; Arqueologia; Dispersão humana; Migração humana. |
Thesagro: |
Biologia; Milho; Zea Mays. |
Categoria do assunto: |
-- |
Marc: |
LEADER 00904nam a2200241 a 4500 001 1186538 005 2012-02-08 008 2005 bl uuuu u01u1 u #d 100 1 $aBUSTAMANTE, P. G. 245 $aMaize (Zea mays L.) dispersion and human migration in the South America$blinking biological and archaeological foccus. 260 $aIn: SIMPOSIO DE RECURSOS GENÉTICOS PARA AMÉRICA LATINA Y EL CARIBE, SIRGEALC, 5., 2005, Montevideo, Uruguay. Resúmenes... Montevideo: Instituto Nacional de Investigación Agropecuaria: Universidad de la República, Facultad de Agronomía$c2005 300 $ap. 44. 650 $aBiologia 650 $aMilho 650 $aZea Mays 653 $aAmérica do Sul 653 $aArqueologia 653 $aDispersão humana 653 $aMigração humana 700 1 $aPÁDUA, V. L. M. 700 1 $aMAIA, V. H. 700 1 $aFRANÇA, L. M. 700 1 $aFERREIRA, P. C. G.
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