Banca de DEFESA: FELIPE GOMES BATISTA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : FELIPE GOMES BATISTA
DATE: 15/07/2020
TIME: 14:00
LOCAL: Online (Googlemeet)
TITLE:

NATURAL RESISTANCE OF FIVE WOOD FOREST SPECIES OF THE CAATINGA BIOME IN A ROTTING FIELD TEST

KEY WORDS:

wood characteristics, durability, deteriorating agents.

PAGES: 83
BIG AREA: Ciências Agrárias
AREA: Recursos Florestais e Engenharia Florestal
SUBÁREA: Tecnologia e Utilização de Produtos Florestais
SPECIALTY: Propriedades Fisico-Mecânicas da Madeira
SUMMARY:

Wood has several uses and can be used for indoor or outdoor use. However, there are certain disadvantages that compromise its natural durability when subjected to direct contact with the soil. Knowing the resistance of species to deterioration is an important tool to improve their use and production for the market. The present study aimed to evaluate the natural resistance of the wood of five native species of the Caatinga - Pau branco (Auxemma oncocalyx Allemão), Jurema preta (Mimosa tenuiflora (Willd.) Poir.), Jurema-de-embira (Mimosa ophthalmocentra Mart. ex Benth), Pereiro (Aspidosperma pyrifolium Mart.) and Sabiá (Mimosa caesalpiniifolia Benth.) in field rot tests. Three trees were felled per species and disks were removed at 0 (base), 25, 50, 75 and 100% of the commercial height of the bole to determine physical properties (basic density, moisture content and porosity). For the chemical (holocellulose, lignin, extractives and ash) and biological (rotting field) analyzes, a log of 1,10 to 1,20 m obtained from the first section of each tree was used. As a comparison standard, Eucalyptus sp. treated. For the test in the rotting field, samples were made with dimensions of 50 cm in length and 8 to 12 cm in diameter, in which they were randomly distributed in the field between blocks and lines with spacing of 1,0 and 0,50 m from each other, respectively. The samples remained buried vertically up to half their length for 300 days, with collections being performed every two months. Among the species studied, M. ophthalmocentra was the one with the highest basic density and the lowest moisture content, while A. pyrifolium obtained the lowest basic density and high moisture content, and the highest percentage of porosity. The highest extractive values were found for M. tenuiflora and M. caesalpiniifolia. The constituents holocellulose and lignin, did not show differences between species. A. oncolalyx exposed the highest percentage of ash. In the rot field analysis, A pyrifolium was the most resistant, while M. tenuiflora and M. ophtalmocentra were the most attacked by deteriorating agents.

BANKING MEMBERS:
Externo à Instituição - DIEGO MARTINS STANGERLIN - UFMT
Externo à Instituição - LEANDRO CALEGARI - UFCG
Externo à Instituição - RAFAEL BELTRAME - UFPel
Presidente - 049.881.764-44 - RAFAEL RODOLFO DE MELO - UFERSA