Avaliação silvicultural de eucalipto em monocultivo e em sistema agroflorestal com diferentes arranjos espaciais

• Ano de defesa: 2011
• Autor(a) principal: Paula, Ranieri Ribeiro
• Orientador(a): Reis, Geraldo Gonçalves dos
• Banca de defesa: Leite, Hélio Garcia , Müller, Marcelo Dias
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Ciência Florestal
• Departamento: Manejo Florestal; Meio Ambiente e Conservação da Natureza; Silvicultura; Tecnologia e Utilização de
• País: BR
• Palavras-chave em Português: Espaçamento; Produção florestal; Brotação
• Palavras-chave em Inglês: Spacing; Forestry; Budding
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL::SILVICULTURA
• Link de acesso: http://locus.ufv.br/handle/123456789/3073

This study aimed to evaluate the effect of spatial arrangements on the growth of eucalypt clone (natural hybrid of Eucalyptus camaldulensis) and on biomass production of Brachiaria brizantha Stapf cv. Marandu, in the cerrado region, in Brazil (17°36'09"S and 46°42'02"W). Monoculture spatial arrangements included .6 x2.5 m (1111 trees ha-1) and 3.3 x3.3 m ( 918 trees ha-1) and, agroforestry system (AFS) included (2x2) + 10 m (833 trees ha-1); (3x3) + 9 m (556 trees ha-1) and 9x3 m (370 trees ha-1). Part of the plants in AFS s arrangements was cut at 11.5 months after planting. Tree diameter at breast height (DBH) and total height of intact plants and coppice were measured up to 50 months after planting. Leaf area index (LAI) of eucalypt stand of all spatial arrangements and biomass of pasture for the AFS s arrangements were obtained at 38 and 50 months after planting. The tree arrangements did not affect plant height but asymptotic value was smaller for coppice than for intact plants. DBH and individual volume of intact plants decreased with plant proximity. The greatest volume per hectare (p≤0.01) of intact plants was obtained in 3.6x2.5 m, 3.3x3.3 m and (2x2) + 10 m arrangements. The spatial arrangement did not affect the coppice diameter (p>0.05). Coppice production per hectare was similar to that of intact plants (p>0.05), due to the higher number of stems per stump, being larger (p≤0.01) in the arrangement (2x2) + 10 m. LAI decreased with age and tree density. The pasture biomass was negatively correlated with the LAI at 38 months after tree planting, being greater in low tree density arrangements (p≤0,05). Decapitation of juvenile plants allowed the production of smaller diameter logs, regardless of the tree planting arrangements. The arrangement (2x2) + 10 m and 3.6x2.5 m are appropriate to produce small-diameter logs of intact plants. To obtain larger diameter logs and higher pasture biomass, one can use the 9x3 m arrangement favoring the silvopastoral system.