Encontro de Energia no Meio Rural AGRENER
VALE, Ailton Teixeira do, BRASIL, Maria Aparecida Mourão y LEAO, Alcides Lopes. Caracterização da madeira e da casca de Sclerolobium paniculatum, Dalbergia miscolobium e Pterodon pubescens para uso energético. In Anales del 3. Encontro de Energia no Meio Rural, 2000, Campinas (SP, Brasil) [online]. 2003 [citado 22 Mayo 2013]. Disponible en: <http://www.proceedings.scielo.br/scielo.php?script=sci_arttext&pid=MSC0000000022000000100002&lng=es&nrm=iso> .
A stretch of stricto sensu cerrado scrubland at Água Limpa farm in Brasilia (Federal District, Brazil) was studied to characterise three cerrado species for the purpose of producing energy. The aerial biomass and the characteristics of the wood and bark of Sclerolobium paniculatum, Dalbergia miscolobium and Pterodon pubescens were determined in a total area of 63.56 ha. In ten plots of land, each measuring 20m x 50m, all the trees with a diameter equal to or larger than 5 cm, measured 30 cm above ground, were identified and their diameters recorded. Three specimens of each specie were felled at random in seven pre-established diameter categories. In the field, data on the green mass of trunk and branches (minimum diameter 3 cm) were gathered per specie. In the laboratory, cross-sections of wood with bark from the trunk and branches were examined to obtain moisture content, specific gravity, heat combustion, fixed carbon content and volatile materials content of the wood and bark per tree, per specie and per hectare, as well as the quantity of heat these species make available, structurally characterised by the Cover Value Index. The three species have excellent quality wood for the production of energy in the form of heat, with great heat combustion and high specific gravity. The number of trees per hectare and dry biomass per tree were decisive variables in the estimated production of heat. The highest estimated energy production of wood and bark in the area studied was 58,870.14 MJ/ha presented by the Sclerolobium paniculatum specie, whose individual production was 1,279.78 MJ/tree, the bark accounting for about 22%. The Dalbergia miscolobium specie had the largest number of specimens per hectare (84). With an individual energy production for wood and bark estimated at 335.96 MJ/tree, however, less than half that of the Sclerolobium paniculatum (i.e. 28,221.34 MJ/ha), the bark accounting for about 25%. The Pterodon pubescens specie produced the largest estimated individual heat (1,982.91 MJ/tree) but, owing to the low number of individuals/ha (14), had the lowest production per area: 27,760.71 MJ/ha, the bark accounting for 19.63% of that figure.
Palabras llave : Energy of biomass; wood; bark; cerrado.