Resistência natural de madeiras de cinco espécies do bioma Caatinga em ensaio de campo
The present study aimed to evaluate the natural wood resistance of five native species of the Caatinga in a field test and correlate with the physical-chemical characteristics. For this purpose, three trees were slaughtered by species and discs were removed at 0 (base), 25, 50, 75 and 100% of the...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/30014 |
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| Resumo: | The present study aimed to evaluate the natural wood resistance of five native species of the
Caatinga in a field test and correlate with the physical-chemical characteristics. For this
purpose, three trees were slaughtered by species and discs were removed at 0 (base), 25, 50,
75 and 100% of the commercial height of the stem to determine the physical properties (basic
density, moisture content and porosity) and chemical properties (holocellulose, lignin,
extractives and ash). In the biological analyses, a log of approximately 1,20 m was used
obtained from the first section of each tree. As a standard of comparison, Eucalyptus sp. wood
treated with CCA was used. To perform the test in field, 36 samples (six by species) with
dimensions of 50 cm in length and 8 to 12 cm in diameter were made, in which they were
distributed in a randomized blocks. The samples remained buried vertically in the soil up to
half their length for one year, and were analyzed every two months. In test, the loss of mass,
deterioration index (notes), and the susceptibility index to deterioration (DSI) were evaluated.
The natural durability of Caatinga woods showed varied results under the factors of
biodeterioration, in which as species Auxemma oncocalyx and Aspidosperma pyrifolium were
the most susceptible to biotic and/or abiotic action deterioration over the 365 days of testing,
while Mimosa tenuiflora, Mimosa ophthalmocentra and Mimosa caesalpiniifolia stood out as
highly resistant, being less susceptible to deterioration. All woods were of good quality
according to their natural and technological properties, and can thus be used for the
production of stakes and posts. |
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