MADEIRA SERRADA DE EUCALIPTO: DESAFIOS E PERSPECTIVAS – Reinaldo Herrero Ponce 50
Total Page:16
File Type:pdf, Size:1020Kb
Seminário Internacional de Utilização da Madeira de Eucalipto para Serraria 05 e 06 de abril de 1995 Auditório da Divisão de Mecânica e Eletricidade do IPT São Paulo – SP ANAIS PROMOÇÃO IPEF Instituto de Pesquisas e Estudos Florestias IPT Instituto de Pesquisas Tecnológicas IUFRO International Union of Forestry Research Organizations LCF/ESALQ/USP Departamento de Ciências Florestais Escola Superior de Agricultura “Luiz de Queiroz” Universidade de São Paulo © IPEF, Piracicaba INSTITUTO DE PESQUISAS E ESTUDOS FLORESTAIS Endereço: Av. Pádua Dias, 11 Piracicaba, SP Caixa Postal 530 13400-970 Fax : (0194) 33-6081 Fone : (0194) 33-6155 E-Mail : [email protected] Ficha catalográfica – Biblioteca do IPEF SEMINÁRIO INTERNACIONAL DE UTILIZAÇÃO DA MADEIRA DE EUCALIPTO PARA SERRARIA, São Paulo, 1995. Anais. Piracicaba, IPEF/IPT, 1995 165p. 1. Serraria; 2. Madeira – Eucalyptus; 3. Madeira - uso Editoração Eletrônica Luis Eduardo Facco & Vitor José Moretti de Oliveira Setor de Estatística e Informática – IPEF Impressão Gráfica Universitária Piracicaba Trav. Antonio Pedro Pardi, 54 Fone/Fax: (0194) 22-6675 ANAIS: 1-165, Abr.1995 COMISSÃO ORGANIZADORA Amantino Ramos de Freitas – IPT Carlos Henrique Garcia – IPEF Célia Regina Zanin – IPEF Edwal Rene Ferreira Nunes – IPT Ivani Seirafe Clemente – LOBBY Eventos, Promoções Lídia Francelina Santos e Lima – IPEF Walter de Paula Lima – LCF / ESALQ / USP Walter Suiter Filho – IPEF PATROCINADORES ARACRUZ CELULOSE S.A. CNPq – CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO DURATEX S/A FAPESP – FUNDAÇÃO DE AMPARO A PESQUISA DO ESTADO DE SÃO PAULO FINEP – Financiadora de Estudos e Projetos Financier of Studies and Projects – FINEP IBAMA – INSTITUTO BRASILEIRO DE MEIO AMBIENTE E RECURSOS NATURAIS RENOVÁVEIS INDI – INSTITUTO DE DESENVOLVIMENTO INDUSTRIAL DE MINAS GERAIS MOOSMAYER LINCK EQUIPAMENTOS MADEIREIROS LTDA. RIPASA S.A. CELULOSE E PAPEL PALESTRAS Os originais das palestras, recebidos pela Comissão Organizadora, foram publicados na íntegra, sendo o conteúdo dos mesmos de inteira responsabilidade dos respectivos autores. Anais do Seminário Internacional de Utilização da Madeira de Eucalipto para Serraria - i ANAIS: 1-165, Abr.1995 SUMÁRIO EUCALYPTUS IMPROVEMENT FOR LUMBER PRODUCTION – François S. Malan 1 MANEJO DE FLORESTAS E SUA UTILIZAÇÃO EM SERRARIA – Hilton Thadeu Z. do Couto 20 MANEJO DE Eucalyptus PARA SERRARIA: A EXPERIÊNCIA DA DURATEX S.A. – Franicisco Bertolani; Norival Nicolielo; Raul Chaves 31 MANEJO DE EUCALIPTO PARA USO MÚLTIPLO NA KLABIN – Paulo Kikuti; Ivone Satsuki Namikawa Fier; Raul Speltz 41 DO PLANEJAMENTO E CRITÉRIOS ADOTADOS PELA CVRD PARA IDENTIFICAÇÃO DE CLONES DE E. grandis PARA SERRARIA – Olívio Carmo de Assis Bulhões; Cláudio Costa Cerqueira; Mauro Moraes Albeny; Salim Jordy Filho 42 MADEIRA SERRADA DE EUCALIPTO: DESAFIOS E PERSPECTIVAS – Reinaldo Herrero Ponce 50 TÉCNIAS DE DESDOBRO DE EUCALIPTO – José Nivaldo Garcia 59 LATEST ADVANCES IN SAWMILLING – Ryszard Szymani 68 ESPERIENCIA ARGENTINA EN EL USO DE LA MADERA DE EUCALIPTO – Martín Sanchez Acosta 74 EXPERIENCIA CHILENA EN LA UTILIZACIÓN DEL EUCALIPTO – Ivan E. Luengo Mendoza 92 EQUIPAMENTOS E PROCESSOS PARA SECAGEM DE MADEIRA – Ivaldo P. Jankowsky 109 DRYING EUCALYPTS FOR QUALITY: MATERIAL CHARACTERISTICS, PRE- DRYING TREATMENTS, DRYING METHODS, SCHEDULES AND OPTIMIZATION OF DRYING QUALITY – H. F. Vermaas 119 PLANTATION GROWN CUALYPTS: UTILISATION FOR LUMBER AND ROTARY VENEERS – PRIMARY CONVERSION – Evan. D. Shield 133 Anais do Seminário Internacional de Utilização da Madeira de Eucalipto para Serraria - ii ANAIS: 1-165, Abr.1995 MANEJO DE FLORESTAS PARA SERRARIA NAS EMPRESAS NACIONAIS: ALGUMAS EXPERIÊNCIAS DE MANEJO DE EUCALIPTO PARA SERRARIA – Cláudio Renck Obino; Leonel Freitas Menezes 140 MERCADO DE MADEIRA DE FLORESTAS PLANTADAS – Gordon E. Gresham 147 Anais do Seminário Internacional de Utilização da Madeira de Eucalipto para Serraria - iii SEMINÁRIO INTERNACIONAL DE UTILIZAÇÃO DA MADEIRA DE EUCALIPTO PARA SERRARIA EUCALYPTUS IMPROVEMENT FOR LUMBER PRODUCTION François S. Malan* INTRODUCTION Eucalyptus grandis was introduced into South Africa about 85 years ago mainly to serve as a source of mining timber. Today this species is by for the most important eucalypt planted in the South Africa comprising about 72% of the total plantation area under eucalypts. The total area under this species is estimated at just over 380 000 hectares which is 29% of the total afforested area. About 85% of the total volume of wood produced each year is consumed by the pulp and mining industries of which about 50% is consumed by the pulp and paper industry. The remaining 15% is mainly used for the production of sawn timber and poles. A breeding programme for E. grandis was started in South Africa in 1962. For many years the selection criteria were mainly good tree and growth characteristics, resistance to pest and disease, adaptability, and low levels of growth stress, spirality and brittle heart. Despite a need to include wood properties in breeding programmes, basic wood properties were not seriously considered in breeding programmes for many years, mainly because tree breeders did not know what the requirements were of the various timber processing industries. At present there is a growing demand by the wood processing industry to change and improve the quality of the South African E. grandis timber resource as the wood of this species is put to a wider use. The objective of this paper is to discuss briefly existing knowledge with regard to the wood properties and qualities of E. grandis, as well as methods applied up to now to improve the quality of the wood. VARIATION AND INTER-CORRELATION BETWEEN WOOD PROPERTIES In Eucalyptus grandis density increases rapidly with increasing distance from the pith; especially in the zone of juvenile wood (Taylor, 1973a and 1973b; Sardinah, 1974; Stöhr and Mackay, 1983; Malan, 1988b; Bhat et al., 1990). In areas of fast growth, such as South Africa, juvenile wood is of considerable importance as it constitutes a large proportion of the stem and is therefore an important source of variation. The radial increase in density, however, becomes less pronounced with increasing height (Malan, 1988b; Taylor, 1973b). Variations in density along the stem are less consistent than those in the radial direction. As the cylinder of juvenile wood extends from the base of the stem to the top, the proportion of juvenile wood over the cross-section of the slem increases. As a result of this a decrease in density often occurs in many species, especially in softwoods. In E. grandis, however, density commonly increases with height above ground level although an initial decline may sometimes be present (Taylor, 1973a and 1973b; Stöhr and Mackay, 1983; Bhat et al., 1990). * Division of Forest Science and Technology, CSIR, P.O. Box 395, Pretoria, South Africa. Anais do Seminário Internacional de Utilização da Madeira de Eucalipto para Serraria - 1 FRANÇOIS S. MALAN Fibre length, diameter and wall thickness increase rapidly with increasing distance from the pith levelling off after about 8 to 15 years (Malan and Gerischer, 1987; Bhat et al., 1990). Height in tree has little effect on fibre length, while fibre diameter increase with height in tree to about mid-height followed by a decrease higher up (Taylor, 1973a and 1973b; Bhat et al., 1990). Between-tree differences in fibre length, though small, were found statistically significant while differences in fibre diameter were small and non-significant (Taylor, 1973b). Bhat et ai. (1990) observed no significant difference in fibre length between trees. As fibre-wall thickness is closely related to wood density, variation in wall thickness from tree to tree and within individual trees is similar to the patterns of density variation. Vessel diameter increases with increasing distance from the pith while vessel frequency declines. The proportions of the various tissue types change relatively little with age and height above ground level (Wilkes, 1988; Malan and Gerischer, 1987; Sardinah, 1974; Taylor, 1973a and 1973b). The inter-correlations between wood properties were studied by Malan (1991) using material obtained from an 8,5-year-old E. grandis diallel progeny trial consisting of72 full-sib families. Of the 55 phenotypic correlation coefficients computed between all possible pairs of variables, 31 were significant at the 5% level of probability or higher. A summery of these results are given in Table 1. Results of a factor analysis that was subsequently performed to increase interpretability and to find the most suitable variables to describe wood property variation, indicated that about 82% of the total variation in the basic wood properties of E. grandis can be described by wood density, fibre length and vessel diameter. Table 1: Correlations between some wood properties (n=141) (From: Malan, 1991) FACTORS AFFECTING WOOD PROPERTIES AND VARIATION PATTERNS Silvicultural effects The control of stand density, either through initial spacing or thinning or a combination of the two, are silvicultural practices strongly influencing both tree growth and wood formation. Assuming that Anais do Seminário Internacional de Utilização da Madeira de Eucalipto para Serraria - 2 EUCALYPTUS IMPROVEMENT FOR LUMBER PRODUCTION nutrient and water availability is similar, the individual trees of widely-spaced and/or thinned stock will grow faster than crowded trees. Because of the impact that thinning has on crown development and growth rate, it can have a significant