Lenho e Casca de Eucalyptus e Acacia em Plantios Monoespecíficos e Consorciados

Silva, Camila Luiz; Roldão, Bruna de Carvalho; Santos, L.D. Tuffi; Hein, Paulo Ricardo Gherardi

doi:10.1590/2179-8087.081914

Cited by 9 publications

(4 citation statements)

References 14 publications

(16 reference statements)

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“…The bark percentage on the trunk of Acacia trees was higher (14.6% of trunk volume) than the Urograndis (6.7% of trunk volume). Silva et al (2018) obtained high bark contents in A. mangium planted in monoculture and indicate the hypothesis that when planted in denser spacing, the specie produces more bark as a response to stress by competition for nutrients, water and light.…”

Section: Discussionsupporting

confidence: 59%

THE PRESENCE OF BARK IN Acacia mangium WOOD IMPROVES ITS ENERGETIC POTENTIAL

Sette¹,

Souza²,

Coneglian³

et al. 2020

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ResumoA presença da casca na madeira de Acácia mangium melhora o seu potencial energético. A utilização da casca associada com a madeira de espécies florestais, para a geração de energia, pode ser uma alternativa viável do ponto de vista técnico, ambiental e econômico. O trabalho teve como objetivo avaliar o efeito da adição da casca nas características da madeira e de briquetes de Acácia mangium e Eucalyptus urophylla x Eucalyptus grandis (urograndis). Árvores das duas espécies, com 7 anos de idade, foram cortadas de experimento de campo e obtidas amostras de madeira com e sem casca para a avaliação das características físico-energéticas da biomassa e briquetes. A presença da casca na madeira da A. mangium melhorou as suas características energéticas, sendo viável do ponto de vista técnico a sua utilização, em pequenas quantidades, em conjunto com a madeira para aplicações energéticas. A adição da casca em pequenas quantidades na madeira do Urograndis promoveu a redução das suas características energéticas. As características dos briquetes não foram influenciadas pela espécie e presença da casca.

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Section: Discussionsupporting

confidence: 59%

THE PRESENCE OF BARK IN Acacia mangium WOOD IMPROVES ITS ENERGETIC POTENTIAL

Sette¹,

Souza²,

Coneglian³

et al. 2020

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“…The area was defined as degraded owing to soil losses and changes in soil chemistry or hydrology [30,31]. The climate of this region is Aw: tropical savannah, with dry winter and rainy summer, according to the Köppen classification [32]. The soil type is litolic neosoil [33] with average texture, total sand = 42.0 dag Kg -1 , silt = 36.0 dag Kg -1 , clay = 22.0 dag Kg -1 , pH-H 2 O = 5.0, organic matter = 4.4 dag Kg -1 , P = 1.5 mg dm -3 , K = 92.0 mg dm -3 , Ca = 1.9 cmol c dm -3 , Mg = 0.8 cmol c dm -3 , Al = 2.4 cmol c dm -3 , H + Al = 6.7 cmol c dm -3 , cation-exchange capacity (CEC) = 5.3 cmol c dm -3 and CEC at natural pH 7.0 = 9.6 cmol c dm -3 after soil chemical and physical analysis carried out in 2014 in a laboratory using standard international protocols [34].…”

Section: Experimental Sitementioning

confidence: 99%

Diversity of arthropods on Acacia mangium (Fabaceae) and production of this plant with dehydrated sewage sludge in degraded area

Silva

Leite

Tavares³

et al. 2020

R. Soc. open sci.

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Sewage sludge is an organic matter-rich material with abundant fractions of nitrogen and other macro and micronutrients, essential for plant growth and development such as Acacia mangium Willd. (Fabales: Fabaceae) used in recovering actions of degraded areas. The objective of this study was to evaluate over 24 months the abundance and diversity of chewing and pollinator insects and arthropod predators on A. mangium plants and the mass production and soil coverage by this plant, fertilized with dehydrated sewage sludge, in a degraded area. The experimental design was in randomized blocks with two treatments (with and without dehydrated sewage sludge) and 24 replications. The number of leaves per branch and branches per plant, defoliation percentage by chewing insects, soil cover and abundance of chewing and pollinator insects and arthropod predators were higher on A. mangium plants fertilized with dehydrated sewage sludge. Nasutitermes sp. (Blattodea: Termitidae) and Trigona spinipes F. (Hymenoptera: Apidae) were the most observed insects on trunks and leaves, respectively, of A. mangium plants fertilized with dehydrated sewage sludge. The A. mangium fertilization increases the populations of different insect and spider groups on this plant.

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“…Six cross diameters were measured for each debarked disc. After obtaining the averaged bark thickness and wood diameter, the bark content was calculated as the ratio between the area occupied by the bark and the total area determined as a function of bark thickness and wood diameter, as described in Silva et al (2018).…”

Section: Determination Of Wood and Bark Productionmentioning

confidence: 99%

“…Miranda & Pereira (2015) have investigated E. globulus trees at 18 years of age and found a mean bark content of 17.4% of the total stem volume for second rotation trees and 13.8% for first rotation trees at the same age. Silva et al (2018) assessed the variation in bark content and thickness of 4.5 year-old Eucalyptus and Acacia planted in pure and mixed stands. The bark content and bark thickness of Acacia trees in monoculture (47.5% and 1.32 cm) were approximately three times higher than those from mixed stand (15.2% and 0.51 cm).…”

Section: Effect Of Plant Spacing On Wood and Bark Growth In Eucalyptumentioning

confidence: 99%

Effect of stand density on longitudinal variation of wood and bark growth in fast-growing Eucalyptus plantations

Ramalho¹,

Pimenta²,

Goulart³

et al. 2019

iForest

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The influence of tree spacing on the wood/bark ratio is unknown in young fastgrowing Eucalyptus trees. The objective of this study was to evaluate the effect of plant spacing on the wood and bark production along the Eucalyptus stem. Four genetic materials were planted in four spacings: 3×1 m, 3×2 m, 3×3 m and 3×4 m. Three 5-year-old trees from each clone and in each plant spacing were harvested. Cross-sectional discs (thickness: 30 mm) were cut from each tree along the stem (0%, 25%, 50%, 75% and 100% of the total tree height) and at 1.3 m above ground, totaling 288 disks (4 spacings × 4 clones × 3 replicates × 6 axial positions). The wood thickness was measured at six random and equidistant points around the perimeter using a gauge and means were calculated from each disc. Six cross diameters were measured for each debarked disc. After obtaining the averaged bark thickness and wood diameter, the bark content was calculated as the ratio between the surface area occupied by the bark and the total area of the stem in each level. In the narrowed plant spacing (3×1), the trees had a mean diameter of 7.4 cm, while at the spacing 3×4 the diameter of the trees was 91% higher (14.11 cm) at breast height. The increase in plant spacing from 3 to 12 m 2 per tree resulted in an increase in bark thickness (56.7%) from 1.94 mm to 3.04 mm, but caused a reduction of bark content (16%) from 9.66% to 8.11%. Our findings show that trees grown under wider spacing tend to produce thicker bark. The bark thickness and the effect of plant spacing on the bark thickness decreased in the base-top direction. The correlation between bark thickness and wood diameter increases from 0.682 to 0.825 with the increase of spacing between trees. In contrast, the bark thickness to bark content correlation decrease from 0.735 to 0.15 with increased plant spacing. The stand density significantly affected the variation of the stem diameter, bark thickness and bark content of Eucalyptus plantations.

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Lenho e Casca de Eucalyptus e Acacia em Plantios Monoespecíficos e Consorciados

Cited by 9 publications

References 14 publications

THE PRESENCE OF BARK IN Acacia mangium WOOD IMPROVES ITS ENERGETIC POTENTIAL

THE PRESENCE OF BARK IN Acacia mangium WOOD IMPROVES ITS ENERGETIC POTENTIAL

Diversity of arthropods on Acacia mangium (Fabaceae) and production of this plant with dehydrated sewage sludge in degraded area

Effect of stand density on longitudinal variation of wood and bark growth in fast-growing Eucalyptus plantations

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