Usage of the pruned log index for loblolly pine (Pinus taeda) and slash pine (Pinus elliottii) Aplicação do Índice de Tora Podada para Pinus taeda e Pinus elliottii
<p>The assessment of the quality of clearwood produced in pruned plantations of pine is necessary, especially to set price and know the utilization potential. The pruned log index (PLI), index used in Chile and New Zealand to characterize the quality of the logs, is a function of measu...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Embrapa Florestas
2010-10-01
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| Series: | Pesquisa Florestal Brasileira |
| Subjects: | |
| Online Access: | http://www.cnpf.embrapa.br/pfb/index.php/pfb/article/view/74 |
| Summary: | <p>The assessment of the quality of clearwood produced in pruned plantations of pine is necessary, especially to set price and know the utilization potential. The pruned log index (PLI), index used in Chile and New Zealand to characterize the quality of the logs, is a function of measurable variables of each log as diameter with defects, diameter 1.3 m from the largest end and the ratio between the cylinder volume common to the entire length of the log and the scaling volume through the method Smalian. This study aims at evaluating the ITP usage for slash pine (Pinus elliottii) logs at the age 24 years and loblolly pine (Pinus taeda) at 19, harvested<br />in the regions of Ibaiti, Paraná, and Itapeva, São Paulo. The PLI values did not exceed 2.3, which indicates that there is little clearwood on the logs. This has been proven through the veneering results, in which the potentially clear volume in relation to the log volume ranged between 52% and 55%, but 10.3% at the maximum, was turned into clearwood veneer. The slicing procedure in the lathe proved to be suitable, since it allowed the diameter of the knotty core to be measured as soon as the knot came out. The PLI showed itself as applicable for the Brazilian conditions.</p><p><span style="line-height: 18px;">doi: 10.4336/2010.pfb.30.62.119 </span></p><br><!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:TrackMoves /> <w:TrackFormatting /> <w:HyphenationZone>21</w:HyphenationZone> <w:PunctuationKerning /> <w:ValidateAgainstSchemas /> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w:DoNotPromoteQF /> <w:LidThemeOther>PT-BR</w:LidThemeOther> <w:LidThemeAsian>X-NONE</w:LidThemeAsian> <w:LidThemeComplexScript>X-NONE</w:LidThemeComplexScript> <w:Compatibility> <w:BreakWrappedTables /> <w:SnapToGridInCell /> <w:WrapTextWithPunct /> <w:UseAsianBreakRules /> <w:DontGrowAutofit /> <w:SplitPgBreakAndParaMark /> <w:DontVertAlignCellWithSp /> <w:DontBreakConstrainedForcedTables /> <w:DontVertAlignInTxbx /> <w:Word11KerningPairs /> 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</xml><![endif]--> <!-- /* Font Definitions */ @font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4; mso-font-charset:1; mso-generic-font-family:roman; mso-font-format:other; mso-font-pitch:variable; mso-font-signature:0 0 0 0 0 0;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-unhide:no; mso-style-qformat:yes; mso-style-parent:""; margin-top:6.0pt; margin-right:0cm; margin-bottom:6.0pt; margin-left:0cm; text-align:justify; text-indent:42.55pt; line-height:24.0pt; mso-line-height-rule:exactly; mso-pagination:none; mso-layout-grid-align:none; font-size:12.0pt; mso-bidi-font-size:10.0pt; font-family:"Arial","sans-serif"; mso-fareast-font-family:"Times New Roman"; mso-bidi-font-family:"Times New Roman";} .MsoChpDefault {mso-style-type:export-only; mso-default-props:yes; font-size:10.0pt; mso-ansi-font-size:10.0pt; mso-bidi-font-size:10.0pt;} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> <!--[if gte mso 10]> <mce:style><! /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} --> <!--[endif] --> <p class="MsoNormal" style="text-indent: 0cm; line-height: 14pt;"><span style="line-height: 18px;">A avaliação da qualidade da madeira clear produzida em plantações podadas de Pinus é necessária, especialmente, para definir preço e conhecer o potencial de aproveitamento. O índice de tora podada (ITP), valor utilizado no Chile e na Nova Zelândia para caracterizar a qualidade das toras, é função de variáveis mensuráveis de cada tora, como diâmetro com defeitos, diâmetro a 1,3 m da extremidade maior e razão entre o volume do cilindro comum a toda extensão da tora e o volume da cubagem obtido pelo método de Smalian. O presente trabalho teve como objetivo avaliar o uso do ITP para toras de Pinus elliottii aos 24 anos e Pinus taeda aos 19 anos de idade, colhidas nas regiões de Ibaiti, PR, e Itapeva, SP. Os valores de ITP não passaram de 2,3, indicando ocorrência de pouca madeira clear nas toras. Isto foi comprovado com o resultado da laminação, em que o volume potencialmente clear em relação ao volume das toras variou entre 52% e 55%, mas 10,3% no máximo foi transformado em lâminas clear. O procedimento de laminação no torno mostrou-se adequado, pois permitiu a medição do diâmetro do núcleo nodoso no instante do surgimento do nó. O ITP mostrou-se aplicável para as condições do Brasil.</span></p><p class="MsoNormal" style="text-indent: 0cm; line-height: 14pt;"><span style="line-height: 18px;"><br />doi: 10.4336/2010.pfb.30.62.119 <br /></span></p> |
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| ISSN: | 1809-3647 1983-2605 |