Uso do ultrassom na avaliação silvicultural de Schizolobium amazonicum Huber ex Ducke

Abstract

The general objective of the study was to propose and evaluate a methodology using ultrasound for the silvicultural evaluation of Schizolobium amazonicum Huber ex Ducke. Wooden discs with natural and artificial perforations were evaluated, as well as standing trees attacked by xylophagous organisms, using ultrasound. The distance and wave propagation time between points marked on the materials were measured and then, with the propagation speed results, images were created, aiming to identify possible damage. The disks with natural perforation had an overall average propagation speed of 1267 m s-1 and an average standard deviation of 494, compared to the disk without perforation, which had an average speed of 1739 m s -1 and a standard deviation of 138. The disks with perforation artificial samples presented a mean ranging from 1705 to 1533 m s-1 , and a standard deviation between 58 and 348. The standing trees had an average speed of 1175 m s -1 and a standard deviation of 1188. The images identified internal damage to discs with natural perforation, as well as damage to discs with artificial perforation from 6cm in diameter, which is proven by the change in the color scale of the images of the respective materials. In trees, the results followed the same trend, confirmed by the images. It is therefore concluded that ultrasound was promising in evaluating the quality of wood and the methodology developed was able to visually demonstrate the internal damage of the discs and trees evaluated.