scholarly journals Comparison Between Open Pollinated Progenies and Hybrids Performance in Eucalyptus grandis and Eucalyptus urophylla

2006 ◽  
Vol 55 (1-6) ◽  
pp. 192-196 ◽  
Author(s):  
O. Bison ◽  
M. A. P. Ramalho ◽  
G. D. S. P. Rezende ◽  
A. M. Aguiar ◽  
M. D. V. De Resende
Keyword(s):  
Wood Density ◽  
Great Influence ◽  
Eucalyptus Grandis ◽  
Basic Density ◽  
Improvement Program ◽  
Lattice Design ◽  
Wood Basic Density ◽  
Breast Height ◽  
Selection For ◽  
Do So

Summary The cellulose industry in Brazil uses, mainly, hybrids between Eucalyptus grandis × E. urophylla. Not only the volume but also the wood density has great influence in the cellulose productivity, therefore a selection for both characteristics should be done as an alternative to increase the improvement program efficiency. The present work has been carried out with the objective of comparison between Open Pollinated progenies (OP) and hybrids performance in E. grandis and E. urophylla. To do so, 15 OP progenies of E. grandis, 15 OP progenies of E. urophylla, and 15 hybrids between E. grandis × E. urophylla, plus four controls were evaluated. The experiment was carried out from October to November 2001, in three sites, Aracruz and São Mateus, in the Espírito Santo State, and Caravelas, Bahia State, Brazil, in a 14 × 14 lattice design, involving the 49 treatments mentioned plus other progenies not considered in this article, with single tree plots and 40 replicates. Two years later the circumference at breast height (CBH) and the basic wood density (BWD) were evaluated. The hybrids performance for CBH was higher, an average, 38,7% than the OP progenies for both species. Part of the heterosis in relation to parental means could be attributed to the inbreeding depression due to selfing that occurred in the OP progenies and the dominance controlling this character. For the BWD the hybrids performance was the same of the OP progenies. Since there was divergence between the parents, it can be inferred that dominance has no importance for this trait. The negative correlation between the CBH and the BWD could impair the simultaneous selection for both traits, depending on the wood basic density range used by the industry.

WITHIN AND BETWEEN-TREE VARIATION OF BARK CONTENT AND WOOD DENSITY OF EUCALYPTUS GLOBULUS IN COMMERCIAL PLANTATIONS

IAWA Journal ◽  
2001 ◽  
Vol 22 (3) ◽  
pp. 255-265 ◽  
Author(s):  
Teresa Quilhó ◽  
Helena Pereira
Keyword(s):  
Wood Density ◽  
Tree Growth ◽  
Eucalyptus Globulus ◽  
Basic Density ◽  
Dry Weight ◽  
Bark Thickness ◽  
Reasonable Accuracy ◽  
Wood Basic Density ◽  
Breast Height ◽  
Coefficients Of Variation

Eucalyptus globulus trees, 15 years old, were sampled at different heights from commercial pulpwood plantations in two sites in Portugal. Bark thickness was higher in the site with better growth and always decreased from the tree base to the top. Bark content was site independent and on average 11% of stem dry weight, higher at the base and top, and lower at 35% height level.Tree mean wood basic density averaged 600 kg /m3 and 568 kg /m3 for best and worst site, respectively, and was not correlated with tree growth. Wood density increased from base to top of the tree. Between-tree variation was low with coefficients of variation of site mean below 10%. Bark density (374 kg /m3 and 454 kg /m3 for best and worst site, respectively) did not show significant within tree variation. Average tree wood density could not be predicted with reasonable accuracy using a breast height sampling and better results were obtained using a sampling as a percentage of total height (e.g. 15%).

scholarly journals ANATOMICAL, ULTRASTRUCTURAL, PHYSICAL AND MECHANICAL WOOD PROPERTIES OF TWO-YEAR-OLD Eucalyptus grandis × Eucalyptus urophylla CLONES

2018 ◽  
Vol 42 (2) ◽  
Author(s):  
Antonio José Vinha Zanuncio ◽  
Amélia Guimarães Carvalho ◽  
Angélica de Cassia Oliveira Carneiro ◽  
Mario Tomazello Filho ◽  
Paulina Valenzuela ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Radial Direction ◽  
Eucalyptus Grandis ◽  
Basic Density ◽  
Wood Properties ◽  
Eucalyptus Urophylla ◽  
Wood Basic Density ◽  
Eucalyptus Wood ◽  
Adult Trees

ABSTRACT Eucalyptus wood from adult trees is used for several purposes; however, the wood of younger trees has limited use. This study aims to characterize and propose uses of two-year-old eucalyptus wood. Six two-year-old Eucalyptus grandis × Eucalyptus urophylla clones have been selected and their anatomical, ultrastructural, physical and mechanical wood characteristics evaluated. The wood of Clone A shows more robust fibers with better microfibril arrangement, resulting in better mechanical properties, and therefore, a better performance for structural use. Clone F showed a low variation of wood basic density in the radial direction, facilitating its machinability, and with the Clone B, showed a lower anisotropy, and therefore, the wood is recommended for locations with high variations of humidity. The heterogeneity of the wood characteristics of the evaluated clones confirms the need for further studies, to choose those most adequate to each use.

Conversion between basic density and apparent density at any moisture content in Eucalyptus grandis

Holzforschung ◽  
2014 ◽  
Vol 68 (8) ◽  
pp. 981-986 ◽  
Author(s):  
Vladimir Eliodoro Costa ◽  
Marcos Antônio de Rezende ◽  
Valdemir Antônio Rodrigues
Keyword(s):  
Moisture Content ◽  
Apparent Density ◽  
Forest Inventory ◽  
Linear Models ◽  
Eucalyptus Grandis ◽  
Basic Density ◽  
Volumetric Shrinkage ◽  
Wood Basic Density

Abstract Wood basic density (BD) is related to other wood characteristics and its determination is important in forest inventory, though BD must be differentiated from the apparent density (AD), which relates to the moisture content (MC) of wood. The aim of this study is to demonstrate a reliable conversion from BD to AD for any MC of Eucalyptus grandis wood based on two exponential and linear models that relate volumetric shrinkage to MC. To this end, wood specimens were submitted to drying and the volumetric shrinkage was determined as a function of MC. The two models proved to be efficient in the conversion of BD to AD and vice versa.

scholarly journals Basic density and CO2 sequestration in seven species from the Commemorative Arboretum of 500 Years of Brazil in Alberto Löfgren State Park, São Paulo

2021 ◽  
Vol 14 (8) ◽  
Author(s):  
Reinaldo Viana de Sousa ◽  
Tatiana Martins Thomaz ◽  
Sandra Monteiro Borges Florsheim ◽  
Israel Luiz de Lima ◽  
Eduardo Luiz Longui ◽  
...  
Keyword(s):  
Wood Density ◽  
Basic Density ◽  
Sao Paulo ◽  
São Paulo ◽  
Individual Tree ◽  
Wood Basic Density ◽  
Prunus Cerasoides ◽  
Guazuma Ulmifolia ◽  
Content Capture ◽  
Maximum Moisture Content

Carbon sequestration involves the removal of CO2 from the atmosphere, aiming to reduce the greenhouse effect. Wood basic density is a direct part of this process. We selected five trees in each of the following species to determine wood basic density and quantify carbon, both sequestered and fixed, for 10 years: Alchornea sidifolia, Ceiba speciosa, Gallesia integrifolia, Guazuma ulmifolia, Inga marginata, Maclura tinctoria, and Prunus cerasoides. The study was conducted in the Commemorative Arboretum of 500 Years of Brazil in Alberto Löfgren State Park, São Paulo. Using maximum moisture content capture of CO, we studied variations of wood density and CO2, both fixed and sequestered, by an individual tree in the same species and between species. Values of fixed and sequestered CO2 showed variations among species with a high dependence on wood density such that trees with higher amounts of CO2, both fixed and abducted, were also trees that showed the highest increment both in height and diameter (DBH). Based on these metrics, G. ulmifolia, I. marginata, M. tinctoria, and P. cerasoides showed the most potential to sequester carbon. Our calculations showed that planting these four species would result in the sequestration of around 30 tons of carbon per hectare.

scholarly journals Estimate of the density of Eucalyptus grandis W. Hill ex Maiden using near infrared spectroscopy

CERNE ◽  
2013 ◽  
Vol 19 (4) ◽  
pp. 647-652 ◽  
Author(s):  
Silviana Rosso ◽  
Graciela Ines Bolzon de Muniz ◽  
Jorge Luis Monteiro de Matos ◽  
Clóvis Roberto Haselein ◽  
Paulo Ricardo Gherardi Hein ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Wood Density ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Eucalyptus Grandis ◽  
Basic Density ◽  
Coefficient Of Determination ◽  
Least Squares Regression ◽  
Old Trees

This study aimed to analyze use of near infrared spectroscopy (NIRS) to estimate wood density of Eucalyptus grandis. For that, 66 27-year-old trees were logged and central planks were removed from each log. Test pieces 2.5 x 2.5 x 5.0 cm in size were removed from the base of each plank, in the pith-bark direction, and subjected to determination of bulk and basic density at 12% moisture (dry basis), followed by spectral readings in the radial, tangential and transverse directions using a Bruker Tensor 37 infrared spectrophotometer. The calibration to estimate wood density was developed based on the matrix of spectra obtained from the radial face, containing 216 samples. The partial least squares regression to estimate bulk wood density of Eucalyptus grandis provided a coefficient of determination of validation of 0.74 and a ratio performance deviation of 2.29. Statistics relating to the predictive models had adequate magnitudes for estimating wood density from unknown samples, indicating that the above technique has potential for use in replacement of conventional testing.

scholarly journals Wood basic density effect of Eucalyptus grandis in the paper making

2019 ◽  
Vol 24 (3) ◽  
Author(s):  
Victor Gonçalves Cremonez ◽  
Eraldo Antonio Bonfatti Junior ◽  
Alan Sulato de Andrade ◽  
Eliane Lopes da Silva ◽  
Ricardo Jorge Klitzke ◽  
...  
Keyword(s):  
Eucalyptus Grandis ◽  
Basic Density ◽  
Density Effect ◽  
Paper Making ◽  
Wood Basic Density

Comparative evaluation of Eucalyptus globulus and E. nitens wood and fibre quality

IAWA Journal ◽  
2017 ◽  
Vol 38 (1) ◽  
pp. 105-116 ◽  
Author(s):  
Isabel Carrillo ◽  
Sofía Valenzuela ◽  
Juan Pedro Elissetche
Keyword(s):  
Wood Density ◽  
Eucalyptus Globulus ◽  
Growth Ring ◽  
Fibre Length ◽  
Basic Density ◽  
Correlation Coefficients ◽  
Drilling Tool ◽  
Density Correlation ◽  
Breast Height ◽  
Micro Drilling

An evaluation of 100 Eucalyptus globulus and 100 E. nitens trees (six years old) was made using the Pilodyn micro-drilling tool as an indicator of wood density. Thirty E. globulus and thirty E. nitens trees with high, medium and low density were selected and sampled with an increment borer at breast height for anatomical analysis using fibre tester equipment and the Resistograph device to generate detailed information about fibre biometry and anatomical wood properties of both species for hybrid development. Eucalyptus globulus trees had a basic wood density average of 478 kg/m3, while E. nitens had a density of 490 kg/m3. Both micro-drilling tools showed significant correlation coefficients with basic wood density. Correlation coefficients between basic wood density and Pilodyn values were negative, being -0.53 (p = 0.01) and -0.68 (p < 0.001) for E. globulus and E. nitens, respectively. For both species a positive correlation was observed between basic density and Resistograph mean amplitude; the correlation coefficient was 0.84 (p < 0.001) for E. globulus, and 0.85 (p < 0.001) for E. nitens. Eucalyptus nitens trees had a higher density and amplitude average and smaller Pilodyn values than E. globulus trees, while the latter had higher coarseness, fibre length and diameter at breast height than E. nitens trees. However, E. nitens showed larger differences between features of earlywood and latewood in a growth ring than E. globulus trees.

scholarly journals Genetic dissection of growth, wood basic density and gene expression in interspecific backcrosses of Eucalyptus grandis and E. urophylla

BMC Genetics ◽  
2012 ◽  
Vol 13 (1) ◽  
pp. 60 ◽  
Author(s):  
Anand Raj Kullan ◽  
Maria M van Dyk ◽  
Charles A Hefer ◽  
Nicoletta Jones ◽  
Arnulf Kanzler ◽  
...  
Keyword(s):  
Gene Expression ◽  
Eucalyptus Grandis ◽  
Basic Density ◽  
Genetic Dissection ◽  
Wood Basic Density

Behavior of wood basic density according to environmental variables

2021 ◽  
Author(s):  
Gabriel Marcos Vieira Oliveira ◽  
José Márcio de Mello ◽  
Carlos Rogério de Mello ◽  
José Roberto Soares Scolforo ◽  
Eder Pereira Miguel ◽  
...  
Keyword(s):  
Environmental Variables ◽  
Basic Density ◽  
Wood Basic Density

scholarly journals Contribution of some Acacia Species on Carbon Sequestration in Blue Nile State, Sudan

2021 ◽  
pp. 97-105
Keyword(s):  
Carbon Sequestration ◽  
Wood Density ◽  
Carbon Stock ◽  
Tree Height ◽  
Biomass Estimation ◽  
Expansion Factor ◽  
Wood Volume ◽  
Crown Diameter ◽  
Breast Height ◽  
Acacia Seyal

Background: The current challenge is to reduce the uncertainties in obtaining accurate and reliable data of carbon stock changes and emission factors essential for reporting national inventories. Improvements in above ground biomass estimation can also help account for changes in carbon stock in forest areas that may potentially participate in the Reducing emissions from deforestation and forest degradation and other initiatives. Current objectives for such estimates need a unified approach which can be measurable, reportable, and verifiable. This might result to a geographically referenced biomass density database for Sudanese forests that would reduce uncertainties in estimating forest aboveground biomass. The main objective: of this study is to assess potential of some selected forest variables for modeling carbon sequestration for Acacia seyal, vr. Seyal, Acacia seyal, vr. fistula, Acacia Senegal. The specific objectives include development of empirical allometric models for forest biomass estimation, estimation of carbon sequestration for these tree species, estimation of carbon sequestration per hectare and comparing the amount with that reported to the region. A total of 10 sample trees for biomass and carbon determination were selected for each of the three species from El Nour Natural Forest Reserve of the Blue Nile State, Sudan. Data of diameter at breast height, total tree height, tree crown diameter, crown height, and upper stem diameters were measured. Then sample trees were felled and sectioned to their components, and weighed. Subsamples were selected from each component for oven drying at 105 ˚C. Finally allometric models were developed and the aboveground dry weight (dwt) and carbon sequestered per hector were calculated. The results: presents biomass equations, biomass expansion factor and wood density that developed for the trees. In case of inventoried wood volume, corrections for biomass expansion factor and wood density value were done, and new values are suggested for use to convert wood volume to biomass estimates. The results also, indicate that diameter at breast height, crown diameter and tree height are good predictors for estimation of tree dwt and carbon stock. Conclusion: The developed allometric equations in this study gave better estimation of dwt than default value. The average carbon stock was found to be 22.57 t/ha.

Sign in / Sign up

Export Citation Format

Share Document