Relation Between Dendrometric Variables and Growth Stress in Eucalyptus

Vidaurre

2020

Holzforschung

Self Cite

Trees with high levels of growth stress begin to show log end splits (LES) immediately after harvesting, usually reaching its maximum end split in a week, and these tensions also create splits during lumber manufacturing. Interlocked grain is another characteristic that impacts the properties of eucalyptus wood. The aim of this study was to evaluate the effect of growth stress and interlocked grain patterns on log end splitting of seven different hybrid clones of Eucalyptus grandis × Eucalyptus urophylla planted in Brazil. The growth stress indicator (GSI) was measured in standing trees before harvesting. Splits were measured on logs in three different stages, and interlocked grain from wood blocks was obtained across the center of the cross-section. The results showed that LES occurred as soon as the trees were harvested; however, for better selection of clones, LES should be evaluated after a week of harvesting. There were statistically significant correlations for GSI with LES. Clones that presented higher values of interlocked grain tended to develop lower values of GSI and LES. Using GSI and interlocked grain measurements, it was possible to select the most indicated eucalyptus clones for lumber production.

Section: Methodsmentioning

confidence: 99%

Effect of growth stress and interlocked grain on splitting of seven different hybrid clones ofEucalyptus grandis×Eucalyptus urophyllawood

Vidaurre

2020

Holzforschung

Self Cite

“…In addition, this sawing method (plain sawing) is the most used in the eucalyptus lumber industry, aiming for superior quality of wood, and greater values in the market. França et al (2017b) detailed the plantation and some dendrometric variables used during the tree selection. Initial moisture content and air drying samples were prepared according to the method proposed by Simpson (1991), as shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Air-drying of seven clones of Eucalyptus grandis × Eucalyptus urophylla wood

Maciel

et al. 2019

BioRes

Selecting clones with the best genetic material is one goal of eucalyptus breeding programs. Understanding the variations between the wood from different hybrid clones during drying is necessary to process improvement. This study aimed to select eucalyptus clones for lumber production based on their drying defects. From a plantation in Brazil, 42 trees within the seven different clones were used. All trees were 13 years old. The effect of the genetic material on the apparent density of the clones was significant. It was possible to separate the clones into four groups. Even if the wood was from the same genotype, a load of boards made from Eucalyptus grandis × Eucalyptus urophylla wood exhibited heterogeneity in the drying rate due to factors inherent in the wood, especially the apparent density. The apparent density negatively affected the drying rate of the clones, i.e., approximately 70.5% of the drying rate was explained by the apparent density. Denser pieces exhibited lower drying rates. For a more homogeneous natural drying, it is recommended that the composition of the stacks use pieces with the same apparent density and thus similar initial moisture. The air-drying process is recommended to release any free water from eucalyptus woods.

Maderas, Cienc. tecnol.

“…Factors such as species and silvicultural treatments influence growth stresses (Fournier et al 1994, França et al 2017, Gril et al 2017. In addition to these factors, the trees are exposed to various external disturbances that can cause a permanent change in the orientation of the trunk and change the angle or position of the branches, for example, due to soil properties, extreme snow load, and exposure to prevailing strong winds (Archer 1986, Braz et al 2017.…”

Section: Introductionmentioning

confidence: 99%

“…Also, little is known about the effect of dendrometric variables on growth stresses and, consequently, on wood quality. Some studies have shown a low or even no correlation between the diameter and the height of the trees and growth stresses (Braz et al 2017, França et al 2017.…”

Section: Introductionmentioning

confidence: 99%

“…The basic density is another variable that is easy to measure and correlates with many of the wood's technological properties. Several studies on the relationship between wood properties or dendrometric variables and LGS in trees have been carried out with simple correlations and traditional statistical models (Cardoso Junior et al 2005, Valencia et al 2011, Diaz Bravoet al 2012, Omonte and Valenzuela 2015, França et al 2017, Xavier et al 2018.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Artificial intelligence to growth stresses predicting in Eucalyptus clones using dendrometric variables and wood density

Monteiro

Araújo

Santos

et al. 2023

Eucalyptus planted forests contribute to maximizing lumber production but problems such as longitudinal growth strain can negatively influence the quality of the products. Knowing dendrometric variables and wood properties can help in the prediction of longitudinal growth strain, mainly with the help of artificial intelligence. Thus, the aim of this research was to evaluate the use of artificial neural networks to predict longitudinal growth strain in Eucalyptus trees based on dendrometric variables, spacing between trees and wood density. The longitudinal growth strain was measured in trees of four Eucalyptus clones planted in three spacings. The diameter and height of each tree were measured. The basic wood density was determined. Artificial neural networks were used to estimate longitudinal growth strain as a function of dendrometric variables, tree spacing