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Brasília, Brazil

Mendes R.F.,Federal University of Lavras | Bortoletto Jr. G.,University of Sao Paulo | Garlet A.,Servico Florestal Brasileiro | Vidal J.M.,University of Sao Paulo | And 2 more authors.
Cerne | Year: 2014

The study aimed to investigate the effect of different preservatives products and retentions on the resistance of Pinus taeda plywood to attack by decay fungi. The experiment consisted of six treatments, two types of products preservatives (CCA and CCB), two retentions (4.0 and 6.5 kg / m3), one treatment with water only, which aimed to evaluate the effect only the process of preservatives application, and a control (no treatment). The plywood was produced with Pinus taeda wood, five veneers of 3 mm thickness and phenol-formaldehyde adhesive at a weight of 420 g / m2 (double line). To evaluate the resistance to biodegradation of plywood was used the methodology proposed by ASTM D2017 (2005), and evaluated the fungi Trametes versicolor and Gloeophyllum trabeum. In the resistance evaluation of the panels biodeterioration to attack the fungus Trametes versicolor was no significant effect of product type and retention. The resistance evaluation to attack by fungus Gloeophyllum trabeum, CCA applied in retention of 4.0 kg/cm3 provided greater resistance to biodeterioration than CCB in the same retention, and in the evaluation of two retentions of CCB there was observed that retention increase to 6.5 kg / m3 resulted in significant improvement in the panels resistance to biodegradation. Source

Afonso S.R.,Servico Florestal Brasileiro | Angelo H.,University of Brasilia | De Almeida A.N.,University of Brasilia
Floresta | Year: 2015

The use of non timber forest products has been widely discussed as an important strategy for local sustainable development and environmental conservation, to the extent that their production contributes to community organization, generates income for the communities involved and encourages the maintenance of biodiversity. The Cooperative of Agricultural Producers and Collectors of Pequi of Japonvar (COOPERJAP), Minas Gerais, Brazil, develops researches on the importance of the activity in generating jobs, income, training and community organization. The use of pequis still results in the inclusion of environmental issues in the public discussion. The results indicated a great socio-economic importance of the activity for the region, strengthening the cooperative, generating income and employment opportunities for young people. Source

Amorim P.G.R.,Federal University of Acre | Goncalez J.C.,University of Brasilia | Camargos J.A.A.,Servico Florestal Brasileiro
Cerne | Year: 2013

The use of non-destructive technologies has been very effective in characterization and evaluation of wood quality. This study aimed to characterize the technologically wood of Pinus caribaea and Eucalyptus grandis by Colorimetry. The study was conducted at the University of Brasilia (UNB) in Physics and Engineering Laboratory the Laboratory of Forest Products/ LPF - Brazilian Forest Service (SFB). Species were subjected to standard tests of basic density, shrinkage and bending. For the colorimetric determination of the parameters it was used a spectrophotometer according to the methodology adopted by Camargos (1999). The radial surface of the wood is most suitable for the collecting of the colorimetric parameters and prediction of properties. Property best estimated by this technique was the density, followed by modulus of elasticity (MOE) and modulus of rupture (MOR). Source

Viana R.M.,Servico Florestal Brasileiro | Ferraz J.B.S.,National Institute of Amazonian Research | Neves Jr. A.F.,Federal University of Amazonas | Vieira G.,National Institute of Amazonian Research | Pereira B.F.F.,Federal University of Amazonas
Soil and Tillage Research | Year: 2014

Despite the global importance of Amazon rainforest, few studies have evaluated soil quality indicators (SQI) in this region. This study evaluated 13 SQIs according to their correlation and sensibility to differentiate four areas under different restoration stages in the Brazilian Amazon rainforest: degraded area (DEGR), two restoration areas (REST1 and REST2) and an undisturbed forest (FORE). The different restoration stages had influence on SQIs. Soil bulk density (ρs), total nitrogen (total N) and exchangeable potassium (K+) on soil showed higher number of correlation (P<0.001; rs>|0.70|) with other SQIs and were sensitive (P<0.05) to distinguish the different areas. Soil bulk density decreased in the following order: DEGR>REST1>REST2>FORE. Otherwise, soil total N decreased on a reverse order: FORE>REST2>REST1>DEGR. Increasing restoration status of Amazon rainforest is associated with lower ρs and higher N and K+ concentration on soil. © 2014 Elsevier B.V. Source

Mendes R.F.,Federal University of Lavras | Bortoletto Junior G.,Escola Superior de Agricultura Luiz de Queiroz | Garlet A.,Servico Florestal Brasileiro | de Almeida N.F.,Escola Superior de Agricultura Luiz de Queiroz | Surdi P.G.,Escola Superior de Agricultura Luiz de Queiroz
Cerne | Year: 2013

This study evaluated the effect of pre and post thermal treatment on the resistance of OSB panels to attack by decay fungi, and compared these two forms of thermal treatment with some production variables. The experimental design consisted of seven treatments, with the evaluation of two temperatures of pre thermal treatment of the particles (200 and 240 °C) for a 60 minutes period; post thermal treatment of the panels, produced with and without the application of paraffin, at 220 °C of temperature for a period of 12 minutes; and increasing the content of adhesive and application of paraffin in panels without thermal treatment. For each treatment three panels were produced with nominal density of 0.65 g/cm3 and phenol-formaldehyde adhesive. By analyzing the results it was concluded that the panels with pre thermal treatment at 240 ° C presented great potential for inhibiting the attack of Trametes versicolor fungi and Gloeophyllum trabeum, but with equivalent effect to that obtained with the increasing the content phenol-formaldehyde adhesive. The post thermal treatment did not increase significantly the biological resistance of the OSB panels. Source

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