Seleção de fungos com capacidade de degradação de tocos de Eucalyptus spp. para utilização na destoca biológica

• Ano de defesa: 2014
• Autor(a) principal: Costa, Lais Gonçalves da
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Mestrado em Ciências Florestais; Centro de Ciências Agrárias e Engenharias; UFES; Programa de Pós-Graduação em Ciências Florestais
• Palavras-chave em Português: Stress wave timer; Stumps deterioration; Wood decay fungi; Wood chemistry; Deterioração de tocos; Fungos xilófagos; Química da madeira; Recursos Florestais e Engenharia Florestal; 630
• Link de acesso: http://repositorio.ufes.br/handle/10/1963

The present work aimed to evaluate, through the isolating and selection of fungi, the degradation potential thereof in stumps of Eucalyptus spp., in order to develop an alternative to the conventional process of stumps removal in Eucalyptus spp. Therefore, were collected discs in decayed eucalyptus stumps in the field, and from these were isolated fungi. In order to verify the potential degradation of wood fungi isolated, these were tested in the pre-selection experiment. Was performed molecular identification of isolates exhibiting degradation potential in the preselection experiment. Fungi selected as degrading potential of wood were evaluated in accelerated decay test to detect the actual capacity of deterioration. After this test, was performed a chemical analysis of the decayed wood to verify which wood constituents were damaged by the fungi. The stumps degradation potential in the field by the selected fungi was evaluated with the aid of a penetrometer of impact and through the speed of propagation of stress waves, after four months of inoculation. Isolation of fungi from the field stumps afforded 7 fungi with degradation potential of eucalyptus wood. The identified fungi were Resinicium confertum, Phanerochaete chrysosporium and Trichoderma citrinoviride. Chemical analysis of the wood determined, in generally, most preferably of lignin in the most consumed position of the wood. It was observed the presence of fungi in the inoculated stumps after the field test, but the degradation had little variation in relation to non-inoculated stumps.