Selma Lopes Goulart

Anatomia comparada do lenho de raiz e caule de Aegiphila sellowiana cham. (Verbenaceae)

O trabalho vem contribuir com informacoes sobre a anatomia estrutural da madeira de raiz e caule de Aegiphila sellowiana Cham. (Verbenaceae). O estudo foi conduzido em area de cerrado, no municipio de Pratânia, estado de Sao Paulo. Tres especimes de A. sellowiana foram coletados. Amostras do caule foram coletadas a altura do peito (AP), a 1,30 m do solo, amostras de raizes foram coletadas de 30 a 40 cm da base do tronco. Houve variacao qualitativa e quantitativa entre o lenho de caule e raiz. Camadas de crescimento distintas foram observadas no lenho de caule e raiz. Foram observados placas de perfuracao simples nos elementos de vaso no lenho de caule e raiz. Fibras bifurcadas, com cavidades e interrupcoes da parede, e fibras septadas no lenho dos dois orgaos. Raios uni e multisseriados foram observados em caule e raiz, com uma a tres celulas de largura em caules, com uma a quatro celulas de largura em raiz. As caracteristicas quantitativas relevantes entre o lenho da raiz e caule em A. sellowiana foram comprimento, diâmetro e frequencia de vaso; diâmetro e espessura da parede da fibra; largura, altura e frequencia de raio; diâmetro da pontoacao intervascular.

Strength and stiffness of the reaction wood in five Eucalyptus species

Abstract Tree stems deviating from the vertical position react by the formation of tension wood (TW) or compression wood (CW), which are called in general as reaction wood (RW), in which the cells are modified chemically and anatomically. The focus of the present work is the mechanical behavior of TW in five 37-year-old Eucalyptus species, which were grown on a planting area with an average slope of 28% leading to decentralized pith in the trees, which is an unequivocal indication of the presence of RW. TW and opposite wood (OW) samples were isolated and subjected to a compression-parallel-to-grain test. It was observed that TW is less resistant and less stiff than the OW.

Efeito da Aplicação de Nitrogênio na Produção e Qualidade da Madeira e Carvão Vegetal de um Híbrido de Eucalyptus grandis x Eucalyptus urophylla

The present work aimed to verify the effect of different dosages of nitrogen on the production of dry material, and wood and charcoal quality made from a six years old hybrid clone of Eucalyptus grandis x Eucalyptus urophylla. Overall 40 trees were analyzed and five treatments in four blocks were studied, with two trees sampled per treatment within each block. Treatments consisted in the application of 0, 60, 120 and 240 kg.ha-1 of nitrogen (N) as ammonium sulfate in order to evaluate if the response to such compound was exclusively due to N. An additional treatment was applied with 120 kg.ha-1 of N as ammonium nitrate, totalizing five treatments. The tree growth, basic density, dry mass estimate, chemical and energetic composition of wood were evaluated, as well as physical, chemical and energetic characteristics of charcoal. The production of dry mass tended to increase with the nitrogen dosage applied. The effect of nitrogen dosage did not 2/8 Assis CO, Trugilho PF, Goulart SL, Assis MR, Bianchi ML Floresta e Ambiente 2018; 25(1): e00117914

ANATOMIA DO LENHO DE RAIZ, TRONCO E GALHO DE BARBATIMÃO (Stryphnodendron adstringens (Mart) Coville)

This study aimed to analyze the wood of root, trunk and branch from barbatimao (Stryphnodendron adstringens) in the cerrado area, in Lavras (Minas Gerais State, Southeastern Brazil). Trunk and branch wood samples were removed at 0, 25, 50, 75 and 100% of the trunk and branch total height. Root wood samples were removed at 40 cm depth soil. Qualitatively the barbatimao wood has distinct growth layers for the trunk and branch; at the root they are poorly defined. Diffuse porosity. Simple perforation plates. Inter-vascular and vessel-ray. Bordered, alternate and with garnishes. Vasicentric paratracheal parenchyma. Uniseriate rays predominant, presenting multiseriate rays. The rays are heterocellular, where the ray body is formed by procumbent cells and margins with square and upright cells. It was observed that homogeneous rays are formed only by procumbent cells. Crystals are present at the axial and radial parenchyma cells, and in the fibers. Quantitatively the relevant features to the wood were: higher vessel frequency in branch wood; thicker wall fibers in the root wood and larger rays in the trunk.