Crescimento inicial de um clone de Eucalyptus grandis em diferentes arranjos de plantio no sistema de curta rotação
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Data
2014-01-31
Autores
Machado, Felipe de Córdova [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Com o aumento da necessidade por novas fontes energéticas, faz-se necessário o desenvolvimento de soluções que possam suprir a demanda gerada de energia. O uso de florestas para fins energéticos é uma alternativa por ser fonte de energia limpa e renovável. As florestas de eucalipto do Brasil estão entre as mais produtivas do mundo e com a alteração da densidade de plantio é possível encontrar valores maiores de produtividade. O objetivo deste trabalho foi identificar a influência do arranjo de plantio de um clone de Eucalyptus grandis sobre a densidade básica da madeira e crescimento da espécie. O ensaio foi composto por quatro espaçamentos de plantio: 3,0 m x 1,0m (linha simples), 3,0m x 1,0m x 2,0m (linha dupla), 3,0 m x 1,0m x 1,0m (linha dupla) e 3,0m x 0,5m (linha simples), sendo que cada parcela era de 20m x 90m. As mudas de Eucalyptus grandis, clone G-21, foram plantadas em Junho de 2011, tendo sido realizadas duas avaliações, a primeira aos 12 meses e a segunda aos 24 meses após o plantio. As variáveis analisadas foram: diâmetro, área basal, volume, densidade básica da madeira e biomassa seca. Dentre as variáveis analisadas o diâmetro sofreu influência positiva do espaçamento, os espaçamentos mais amplos apresentaram maior diâmetro. Para área basal, volume, densidade básica e biomassa, pela análise de variância foram detectadas diferenças significativas para as fontes de variação: espaçamento e idade. A maior diferença para a área basal foi encontrada aos 24 meses, onde os espaçamentos mais adensados apresentaram maior área basal. Para todos os espaçamentos houve aumento significativo da área basal, indicando que não houve estagnação do crescimento. O volume apresentou diferença significativa somente aos 24 meses, onde o espaçamento 3x1x2 foi o...
As the increasing needs for new energy sources, it is necessary to develop solutions that can meet the demand generated energy. The use of forests for energy is an alternative to be a source of clean and renewable energy. Eucalyptus forests of Brazil are the most productive in the world and with the change in the density of planting is possible to find greater values of productivity. Therefore, the aim of this study was to identify the influence of the arrangement planting of Eucalyptus grandis on wood density and growth of the species. The test consisted of four planting spacings : 3.0m x 1.0m (single row), 3.0m x 1.0m x 2.0m (double row), 3.0m x 1.0m x 1.0m (double row) and 3.0m x 0.5m (single row) , and each plot was 20m x 90m . The Eucalyptus grandis clone G- 21 was planted in June 2011 and two evaluations were made, the first at 12 months and the second at 24 months after planting. The variables analyzed were: diameter, basal area, volume, wood density and biomass. Among the variables the diameter was positively influenced by the spacing, and wider spacings had higher diameter. For basal area, volume, density and biomass by analysis of variance significant difference was detected for the sources of variation: spacing and age. Basal area the biggest difference between the spacings was found at 24 months, where the denser spacing had higher basal area. For all spacings significant increase of basal area, indicating no growth stagnation. The volume showed a significant difference only at 24 months, where the spacing 3x1x2 was presented the lowest value, for all spacings significant increase in the volume between the two ages examined. The density showed that the smaller density values were found in denser spacing. The highest biomass values were found in the 3m x1m and 3m x 1m x 1m. For the allocation of biomass in different compartments was found the sequence stem > branches ...
As the increasing needs for new energy sources, it is necessary to develop solutions that can meet the demand generated energy. The use of forests for energy is an alternative to be a source of clean and renewable energy. Eucalyptus forests of Brazil are the most productive in the world and with the change in the density of planting is possible to find greater values of productivity. Therefore, the aim of this study was to identify the influence of the arrangement planting of Eucalyptus grandis on wood density and growth of the species. The test consisted of four planting spacings : 3.0m x 1.0m (single row), 3.0m x 1.0m x 2.0m (double row), 3.0m x 1.0m x 1.0m (double row) and 3.0m x 0.5m (single row) , and each plot was 20m x 90m . The Eucalyptus grandis clone G- 21 was planted in June 2011 and two evaluations were made, the first at 12 months and the second at 24 months after planting. The variables analyzed were: diameter, basal area, volume, wood density and biomass. Among the variables the diameter was positively influenced by the spacing, and wider spacings had higher diameter. For basal area, volume, density and biomass by analysis of variance significant difference was detected for the sources of variation: spacing and age. Basal area the biggest difference between the spacings was found at 24 months, where the denser spacing had higher basal area. For all spacings significant increase of basal area, indicating no growth stagnation. The volume showed a significant difference only at 24 months, where the spacing 3x1x2 was presented the lowest value, for all spacings significant increase in the volume between the two ages examined. The density showed that the smaller density values were found in denser spacing. The highest biomass values were found in the 3m x1m and 3m x 1m x 1m. For the allocation of biomass in different compartments was found the sequence stem > branches ...
Descrição
Palavras-chave
Eucalipto - Cultivo, Madeira - Densidade, Cultivos agricolas energeticos, Rotação de cultivos, Wood
Como citar
MACHADO, Felipe de Córdova. Crescimento inicial de um clone de Eucalyptus grandis em diferentes arranjos de plantio no sistema de curta rotação. 2014. viii, 45 p. Dissertação (mestrado) - Universidade Estadual Paulista “Julio de Mesquita Filho” , Faculdade de Ciências Agronômicas de Botucatu, 2014.