PROPRIEDADES FÍSICAS E MECÂNICAS DA MADEIRA DE &lt;i&gt;Eucalyptus benthamii&lt;/i&gt; SOB EFEITO DO ESPAÇAMENTO DE PLANTIO

Benin, Cristiane Carla; Watzlawick, Luciano Farinha; Hillig, Éverton

doi:10.5902/1980509830219

Cited by 15 publications

(18 citation statements)

References 4 publications

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“…Regarding the spacing, the results obtained corroborate with those obtained by Sereghetti et al (2015) and Benin et al (2017), who stated that the basic density is not affected by the spacing. Table 1 -Summary of the analysis of variance for diameter at breast height (dbh), total height (HT), total volume (VT), basic wood density (db), stem biomass (BS), leaf and branches biomass (BLB) and total biomass (BT) for three eucalyptus clones implanted at two different spacing in Jataí-GO.…”

supporting

confidence: 88%

Dendrometric Characteristics and Basic Wood Density of Eucalyptus Clones in Different Spacing

Tavares

Soares

Cruz

2020

Rev. Agric. Neotrop.

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This study aimed to analyze the effect of two planting spacing on dendrometric characteristics and basic wood density of eucalyptus clones. The experiment in the municipality of Jataí-GO, Brazil, used a randomized complete block design with three replications, in which the spacing (3.0 m x 2.0 m and 3.0 m x 3.0 m) were allocated to the plots and the clones (3335, 3336 and 3487) in the subplots. Diameter at breast height (dbh), total height (HT), total volume (VT), basic density (db), stem biomass (BS), leaf and branch biomass (BLB) and total biomass (BT) were evaluated. The data were submitted to analysis of variance, followed by the Tukey test for comparison of means at the 5% probability level. It was found that the dbh and VT characteristics were not influenced by the planting spacing nor by the clone types. The HT was influenced by the spacing with the highest value (26.3 m) verified in the spacing 3 m x 3 m. The db was influenced only by the clone types and the clones 3335 and 3487 presented the highest values (0.46 and 0.41 g.cm-3 , respectively). The BS, BLB and BT were influenced only by clones with higher yields with clones 3335 and 3487. There were no significant interactions for any of the evaluated characteristics.

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supporting

confidence: 88%

Dendrometric Characteristics and Basic Wood Density of Eucalyptus Clones in Different Spacing

Tavares

Soares

Cruz

2020

Rev. Agric. Neotrop.

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“…After cutting off the crown from each trunk, five 3-cm thick disks were obtained, respectively at 0, 25, 50, 75 and 100% of the resulting commercial log length, following the procedures described by Hsing et al [19] and Benin et al [9]. Four-cm diameter wood disks were collected from each sampling point along the log length and cut into wedges for determination of basic density according the procedures from the ASTM D 2395 [5].…”

Section: Wood Density Determinationmentioning

confidence: 99%

Cement boards reinforced with wood sawdust: an option for sustainable construction

et al. 2020

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Ochroma pyramidale is a fast-growing forest species with low-density wood. The present study had the goal to assess the effect of extractive removal on the performance of the species for producing wood-cement boards (WCB). Wood particles were submitted to three types of treatment for extractives removal: cold water, hot water and sodium hydroxide (NaOH). An entirely randomized design with four treatments was established, respectively, T1-control treatment, T2-cold water, T3-hot water and T4-NaOH, with 4 replicates (boards) per experimental treatment, to assess the effect of extractives removal on the boards' physical and mechanical properties. Wood/cement ratio = 1:5, water/cement ratio = 1:2 and 4% CaCl 2 as additive based on dry mass of cement were used. The following WCB properties were evaluated: density, compaction ratio; water absorption and thickness swelling after 2, 24 and 72 h of water immersion; and mechanical strength during static bending (moduli of elasticity and rupture). The results showed there was no need for wood particle treatment, since no improvement of the boards' physical-mechanical properties was achieved by previous application of cold or hot water or NaOH on the particles. Water absorption and thickness swelling were lower than the levels reported in the literature and minimum values specified by WCB factories. Despite having weaker mechanical properties than those required for structural uses, wood from Ochroma pyramidale can be employed in the production of boards designed for use in moist environments but not having structural importance, such as for partitions, walls, tile flooring and exterior siding.

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“…Em geral, foi encontrada uma maior densidade básica com o aumento do espaçamento de plantio aos 24 meses de idade, o que pode ser explicado pelo crescimento mais lento das árvores, resultando em células com uma parede celular mais espessa. Embora esse comportamento ainda não seja um consenso, considerando-se que existem trabalhos nos quais o espaçamento não interferiu na densidade, como o ensaio realizado por Benin et al (2017) que encontraram densidades básicas entre 498 e 501 kg m -3 para madeiras de Eucalyptus benthamii, em distintos espaçamentos simples, aos 6 anos, na região de Guarapuava -PR. O mesmo aconteceu com Lopes et al (2017) que não constataram diferença significativa na densidade básica da madeira e da casca em função dos espaçamentos em diferentes clones de Eucalyptus e Corymbia aos 12 meses de idade.…”

Section: Densidade Básica Do Troncounclassified

Produção de biomassa de <i>Eucalyptus grandis</i> Hill ex. Maiden em diferentes arranjos de espaçamentos de plantio simples e duplos

Machado

Eufrade-Junior

Spada³

et al. 2019

Ciênc. Florest.

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ResumoO objetivo deste trabalho foi avaliar o efeito dos espaçamentos de plantio em linhas simples e duplas na área basal, volume de madeira com casca por hectare, densidade básica do tronco e biomassa arbórea de Eucalyptus grandis Hill ex Maiden (clone G-21) manejado no sistema de curta rotação. O ensaio foi composto por quatro espaçamentos de plantio: 3,0 m × 1,0 m × 2,0 m (linha dupla), 3,0 m × 1,0 m (linha simples), 3,0 m × 1,0 m × 1,0 m (linha dupla) e 3,0 m × 0,5 m (linha simples), sendo avaliado aos 12 meses e 24 meses após o plantio. As principais diferenças significativas foram encontradas no segundo período de avaliação para os fatores de variação considerados -espaçamento e idade. A área basal aumentou com o adensamento das florestas, embora o volume não tenha seguido a mesma tendência aos 24 meses de plantio. A densidade básica aumentou com a idade apenas nos espaçamentos simples. No estudo da alocação de biomassa nos diferentes compartimentos da árvore, verificou-se uma maior proporção de biomassa de tronco com a idade, bem como nos espaçamentos mais adensados. Uma das maiores produções florestais (65 Mg ha -1 ) foi encontrada no espaçamento 3,0 m × 1,0 m aos 24 meses de idade. AbstractThe objective of this work was to analyze the effect of single and double planting spacing on the basal area, stem wood and bark volume per hectare, stem basic density and above-ground biomass of Eucalyptus grandis Hill ex Maiden (G-21 clone) managed under the short rotation coppice system. Four planting spacings were considered: 3.0 m × 1.0 m × 2.0 m (double row), 3.0 m × 1.0 m (single row), 3.0 m × 1.0 m × 1.0 m (double row) and 3.0 m × 0.5 m (single row), which were evaluated at 12 months and at 24 months after planting. Main significant differences were found at 12 months after planting for both factors spacing and age. Basal area increased as planting densification, although the volume did not show the same trend at 24 months after planting. Basic density increased as age only at single rows. In the study of the biomass allocation in the different tree compartments, it was verified a higher proportion of stem biomass on older treatments and denser spacings. One of the highest forest productions (65 Mg ha -1 ) was found in the 3 m × 1 m planting spacing at 24 months of age.

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PROPRIEDADES FÍSICAS E MECÂNICAS DA MADEIRA DE <i>Eucalyptus benthamii</i> SOB EFEITO DO ESPAÇAMENTO DE PLANTIO

Cited by 15 publications

References 4 publications

Dendrometric Characteristics and Basic Wood Density of Eucalyptus Clones in Different Spacing

Dendrometric Characteristics and Basic Wood Density of Eucalyptus Clones in Different Spacing

Cement boards reinforced with wood sawdust: an option for sustainable construction

Produção de biomassa de <i>Eucalyptus grandis</i> Hill ex. Maiden em diferentes arranjos de espaçamentos de plantio simples e duplos

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