Anatomia da madeira de Eucalyptus Benthamii Maiden & Cambage, espécie promissora para o setor de celulose no sul do Brasil

Abstract

RESUMO É investigada a anatomia microscópica da madeira de exemplares jovens de Eucalyptus benthamii Maiden & Cambage (Myrtaceae -Leptospermoideae) procedentes do estado do Rio Grande do Sul. Destacam-se os seguintes caracteres anatômicos: madeira composta por fibras, raios, parênquima axial e, em menores porcentagens, elementos vasculares e traqueídes vasculares; vasos quase sempre solitários, numerosos, em arranjo diagonal e porosidade difusa; parênquima paratraqueal vasicêntrico e confluente; raios unisseriados, homogêneos e heterogêneos; e fibras libriformes. Mesmo sem características singulares em sua estrutura, a presença de elementos vasculares curtos, parênquima paratraqueal e fibras libriformes atestam um caráter relativamente evoluído, comparado às Mirtáceas nativas. Apesar de jovens, as amostras analisadas recomendam a utilização da madeira de Eucalyptus benthamii para a indústria de celulose e papel. Palavras-chave: anatomia da madeira, celulose, Eucalyptus benthamii, Myrtaceae, papel. ABSTRACT[Wood anatomy of Eucalyptus benthamii Maiden & Cambage, a promising species for the cellulose sector in southern Brazil].The microscopic wood anatomy of young specimens of Eucalyptus benthamii Maiden & Cambage (Myrtaceae -Leptospermoideae) from Rio Grande do Sul State (Brazil) was investigated. The following anatomical characteristics were observed: wood composed by fibers, rays, axial parenchyma and, in smaller percentages, vascular elements and vascular tracheids; diffuse porous wood, with solitary and numerous vessels in diagonal pattern; paratracheal and vasicentric confluent axial parenchyma; unisseriate, both homogeneous and heterogeneous rays; and libriform fibers. Although the described species does not present singular characteristics in its anatomical structure, the presence of short vessels, axial parenchyma and libriform fibers, suggests a relatively evolved character compared to native species of Myrtaceae. The analyzed samples, although young, recomends Eucalyptus benthamii wood for cellulose and paper industry.

Application of Different Vegetable Fibers as Natural Sorbents and Their Use in Water Decontamination from Crude Oil

“…Baldin et al [38] studied Eucalyptus benthamii and described the fibers as being of the libriform type: medium to short (0.904 ± 0.130 mm) with thin to thick walls (3.4 ± 1 μm), representing 42 % of the wood volume. Gomide et al [39] studied different clones of the genus Eucalyptus and found an average length of 0.99 mm, a mean width of 18.1 μm, a wall thickness of 4.88 μm, and a lumen thickness of 8.4 μm.…”