scholarly journals Silvicultura de plantaciones de Eucaliptos para productos de madera sólida de alto valor en el Sur de Australia = Silviculture of eucalypt plantations in Southern Australia for high-value solid wood products

2007 ◽  
Vol 13 (1) ◽  
pp. 43-57
Author(s):  
T.G. Baker ◽  
P.W. Volker
Keyword(s):  
Eucalyptus Globulus ◽  
Solid Wood ◽  
Wood Products ◽  
Eucalypt Plantations ◽  
El Sistema

La mayoría de las plantaciones de Eucalyptus han sido establecidas en la región templada de Australia (Australia Occidental, Australia Meridional, Victoria y Tasmania). Eucalyptus globulus es la principal especie en el área, con casi todas las plantaciones bajo el sistema de rotación corta para la producción de pulpa. En Tasmania y en Victoria, tal como en Chile, E. nitens ha sido utilizado como un sustituto de E. globulus, particularmente donde las bajas temperaturas son una limitante para esta última especie. La creciente reserva de bosques naturales, que han sido la fuente del tradicional recurso de la madera aserrada, ha despertado el interés en los productos de madera sólida de estas nuevas plantaciones de Eucalyptus. Hay resistencia a la utilización de la madera solida de Eucalyptus proveniente de plantaciones, principalmente de las industrias procesadoras debido a las dudas sobre la calidad de la madera y la idoneidad de las trozas para el procesamiento. Se requerirán muchas investigaciones para despejar estos temores. Este artículo describe algunos resultados de las investigaciones sobre las propiedades madereras y silvícolas de las plantaciones de Eucalyptus en el sur de Australia, además de las actuales prioridades y actividades de investigación.

scholarly journals The effect of time and site on incidence and spread of pruning-related decay in plantation-grown Eucalyptus nitens

2005 ◽  
Vol 35 (3) ◽  
pp. 495-502 ◽  
Author(s):  
Karen M Barry ◽  
Malcolm F Hall ◽  
Caroline L Mohammed
Keyword(s):  
Quantitative Information ◽  
Solid Wood ◽  
Fungal Species ◽  
Wood Products ◽  
Eucalyptus Nitens ◽  
Ongoing Research ◽  
Yield And Quality ◽  
Eucalypt Plantations ◽  
The Future ◽  
Over Time

Quantitative information on stem decay in eucalypt plantations grown for solid wood products, with consideration of the effect of site, pruning, and spread of decay with time, is required for the prediction of harvest yield and quality. A trial at three Eucalyptus nitens (Dean & Maiden) Maiden plantations in Tasmania revealed that the effect of time on the number and size of decay columns was substantially greater than the effect of site or of whether trees were pruned or not. Length of decay columns was 3.4-fold greater on average for the trees assessed 5.5 years after pruning than at 1 year. All decay columns in pruned trees were restricted to the knotty core, and the amount of decay-free clearwood increased over time. A controlled wounding trial showed that decay in sapwood was not significantly different in length with site but was mainly determined by the fungal species used. Ongoing research to monitor the spread of decay in pruned plantation-grown E. nitens will be important to enable prediction of the future impact of decay on harvest yields of solid wood products.

scholarly journals Managing Australia’s eucalypt gene pools: assessing the risk of exotic gene flow

2016 ◽  
Vol 128 (1) ◽  
pp. 25 ◽  
Author(s):  
Matthew J. Larcombe ◽  
Brad M. Potts ◽  
Rebecca C. Jones ◽  
Dorothy A. Steane ◽  
João Costa E. Silva ◽  
...  
Keyword(s):  
Gene Flow ◽  
Solid Wood ◽  
Biological Data ◽  
Wood Products ◽  
Gene Pools ◽  
Centre Of Origin ◽  
Eucalypt Species ◽  
Eucalypt Plantations ◽  
Plantation Species ◽  
The Many

Most eucalypts are endemic to Australia but they have been introduced into more than 100 countries and there are now over 20 million hectares of eucalypt plantations globally. These plantations are grown mainly for pulpwood but there is expanding interest in their use as a renewable source of solid wood products and energy. In Australia, the eucalypt plantation estate is nearing one million hectares, located mainly in temperate regions and dominated by Eucalyptus globulus and E. nitens (subgenus Symphyomyrtus), which are grown mainly outside their natural ranges. While eucalypt species from different major subgenera do not hybridise, hybrids within subgenera are often reported, including hybrids with plantation species. Concerns were raised in the late 1990s that pollen-mediated gene flow from locally exotic plantation eucalypts may affect the integrity of adjacent native eucalypt gene pools. As Australia is the centre-of-origin of most eucalypt species used in plantations around the world, exotic gene flow is one of the many issues that require management for industry sustainability and certification purposes. We here summarise over a decade of research aimed at providing the framework and biological data to help assess and manage the risk of gene flow from these plantations into native gene pools in Australia.

Genetic analysis of Eucalyptus globulus diameter, straightness, branch size, and forking in Western Australia

2011 ◽  
Vol 41 (6) ◽  
pp. 1333-1343 ◽  
Author(s):  
A.N. Callister ◽  
N. England ◽  
S. Collins
Keyword(s):  
Western Australia ◽  
Eucalyptus Globulus ◽  
Genetic Correlations ◽  
Solid Wood ◽  
Wood Products ◽  
Breeding Populations ◽  
Stem Straightness ◽  
Wood Traits ◽  
Sib Families ◽  
Branch Size

Eucalyptus globulus Labill. is increasingly considered for supply of solid-wood products such as sawlogs, yet genetic studies of solid-wood traits have been lacking. We estimated genetic parameters of growth and form traits that affect log value in full-sib families from two advanced-generation breeding populations on eight sites in Western Australia. Mean single-site heritability was 0.11 ± 0.01 for diameter at breast height (DBH), 0.28 ± 0.05 for stem straightness, 0.09 ± 0.02 for branch thickness, and 0.05 ± 0.02 for forking incidence. Dominance effects were significant (p < 0.05) at four sites for DBH and branch thickness and at three sites (one population) for straightness. Mean intersite additive genetic correlations were 0.76 ± 0.06 for DBH (n = 7), 0.75 ± 0.11 for stem straightness (n = 7), and 0.58 ± 0.07 for branch thickness (n = 4). Mean intersite dominance genetic correlations were 0.90 ± 0.04 for DBH (n = 7), 0.26 ± 0.27 (n = 4) for straightness, and 0.68 ± 0.11 for branch thickness (n = 3). Additive genetic correlations between DBH and straightness ranged from –0.71 ± 0.23 to 0.33 ± 0.19 with an average of –0.18 ± 0.12 (n = 8). Genetic correlations between DBH and branch thickness were mostly weak although straightness was generally associated with thinner branches (mean additive correlation 0.44 ± 0.15, n = 6). We conclude that prospects appear favourable for improving the solid-wood value of E. globulus by selection and breeding.

scholarly journals Improving the accuracy of wood moisture content estimation in four European softwoods from Spain

2021 ◽  
Vol 30 (1) ◽  
pp. e002
Author(s):  
Juan I. Fernández-Golfín ◽  
Maria Conde Garcia ◽  
Marta Conde Garcia
Keyword(s):  
Relative Humidity ◽  
Moisture Content ◽  
Electrical Resistance ◽  
Solid Wood ◽  
Wood Products ◽  
Wood Moisture Content ◽  
Accurate Estimation ◽  
Wood Moisture ◽  
Mathematical Functions ◽  
Measured Moisture Content

Aim of study: To obtain improved models to predict, with an error of less than ± 2.0%, the gravimetric moisture content in four different softwoods commonly present in the Spanish and European markets, based on electrical resistance measurements. This improved moisture content estimation is useful not only for assessing the quality of wood products, especially in the case of laminated products, during the transformation and delivery process, but also for accurately monitoring the evolution of moisture in wood present in bridges and buildings, which is of great importance for its maintenance and service life improvement.Area of study: The study was carried out on samples of Scots, laricio, radiata and  maritime pines of Spanish provenances.Material and methods: On 50x50x20 mm3 solid wood samples (36 per species, 9 per condition), conditioned at 20ºC (±05ºC) and 40±5%, 65±5%, 80±5% or 90±5% Relative Humidity (RH), electrical resistance and oven-dry moisture content was measured. The Samuelsson's model was fitted to data to explain the relationship between the two variables. The accuracy of the model was evaluated by the use of an external sample.Main results: With the proposed mathematical functions the wood moisture content can be estimated with an error of ±0.9% in the four species, confirming the effectiveness of this nondestructive methodology for accurate estimation and monitoring of moisture content.Research highlights: our results allow the improvement of the moisture content estimation technique by resistance-type methodologies.Keywords: Resistance-type moisture meter; species correction.Abbreviations used: MC: Moisture content; RH: relative Humidity; R: electrical resistance; RP: wood electrical resistance measured parallel to the grain; RT: electrical resistance measured perpendicular (transversally) to the grain; GM-MC: gravimetrically measured moisture content.

scholarly journals Studi Perbandingan Analisis Struktur Rumah 2 Lantai Menggunakan Kayu Glulam dan Kayu Solid Terhadap Beban Gempa. (Hal. 85-94)

2019 ◽  
Vol 5 (1) ◽  
pp. 85
Author(s):  
Ramdhan Taufik ◽  
Erma Desmaliana ◽  
Amatulhay Pribadi
Keyword(s):  
Construction Material ◽  
Pushover Analysis ◽  
Solid Wood ◽  
Wood Products ◽  
Basic Material ◽  
Class Iii ◽  
Base Shear ◽  
Non Linear ◽  
The Difference ◽  
Immediate Occupancy

ABSTRAKKondisi geografis Indonesia memiliki struktur tektonik kompleks. Kondisi ini membuat perencanaan rumah tinggal 2 (dua) lantai membutuhkan pertimbangan khusus dari segi kekuatan dan kekakuan. Penggunaan material kayu sebagai bahan konstruksi di Indonesia masih jarang digunakan. Kayu glulam adalah suatu produk kayu rekayasa yang dibuat dari beberapa bilah kayu yang direkatkan dengan arah sejajar serat menggunakan perekat berupa lem. Penelitian ini bertujuan untuk mengidentifikasi respon struktur pada rumah tinggal menggunakan material kayu glulam dan solid dengan bantuan program ETABS 2016. Berdasarkan analisis yang telah dilakukan, diperoleh nilai periode struktur, gaya geser dasar, dan simpangan antar lantai antara seluruh model menunjukan hasil yang berbeda, perbedaan diakibatkan dari hasil konversi berat jenis dan modulus of elastisity berdasarkan BS EN 1194:1999. Berdasarkan analisis non-linier pushover didapatkan bahwa kayu glulam Nyatoh (kayu kelas III) berada pada level pada kinerja B to IO (Immediate Occupancy), dimana hasil tersebut tidak berbeda jauh dengan kayu solid Bangkirai (kayu kelas I).Kata Kunci: rumah tinggal, kayu glulam, non-linier pushover ABSTRACTGeographical condition of Indonesia has a complex tectonic structure. These conditions create  2-storyhome-planning that require special consideration in terms of strength and rigidity. The use of wood as a construction material in Indonesia is still rarely used. Glulam wood is a wood products engineering made from wooden slats several glued with the direction of the parallel fibers using adhesives. This research aims to identify the structure of the response at home using basic material glulam and solid wood with the help of ETABS 2016 programs. Based on the analysis that has been done, obtained the value of the structure periode, base shear force, and interstory drift between all models show different results, the difference is due to the results of specific gravity conversion and modulus of elasticity base on BS EN 1194:1999. Based on non-linear pushover analysis, it shows that Nyatoh glulam wood (class III wood) was at the level of the B to IO (Immediate Occupancy) performance, where the results were not much different from Bangkirai solid wood (class I wood).Keywords: home livingstructure, glulam wood, non-linear pushover

scholarly journals Evaluación del predio forestal San Vicente con fines de manejo y conservación ubicado en el cantón guano, Ecuador

2020 ◽  
Vol 3 (1.1) ◽  
pp. 147-167
Author(s):  
Hernán Eriberto Chamorro Sevilla ◽  
Gladys Janneth Urquizo Buenaño ◽  
Ana Lucila Cushpa Guamán ◽  
David Francisco Lara Vásconez
Keyword(s):  
Pinus Radiata ◽  
Eucalyptus Globulus ◽  
El Sistema

La presente investigación se basa en la ordenación de los rodales que integran el predio forestal San Vicente, y es complementada por la descripción de su situación actual y el cálculo de indicadores dasométricos. Estos fueron componentes requeridos para la generación de estrategias de manejo técnico, mediante la aplicación del muestreo sistemático al instalar parcelas circulares de 250 m2 para el rodal uno, el censo al rodal 2 y el muestreo exploratorio a los rodales 3, 4 y 5. Según los resultados, el predio San Vicente está caracterizado por un rodal formado por cinco bloques de árboles de Pinus radiata, el rodal dos por árboles de Cupressus macrocarpa, el rodal 3 consta de dos bloques de Eucalyptus globulus en estado latizal bajo, el rodal cuatro o zona  de  conservación formado por especies arbóreas, arbustivas y herbáceas  y un quinto rodal o zona aprovechada. De acuerdo a lo expuesto, se propone aplicar raleo a una intensidad del 20 al 30% para los bloques del rodal uno, actividad de poda a los árboles de Cupresus macrocarpa del rodal dos, el rodal 3 requiere un manejo gradual de los árboles de Eucalyptus globulus en estado de latizal bajo; con fines de madera aserrada y postes se podría dejar entre 1-3 rebrotes por tocón, y para combustible (leña) un número mayor a tres; el rodal cuatro, se dejará como está y que los factores del sitio incidan hasta el próximo monitoreo entre 2-4 años. Finalmente, para el rodal cinco, se plantea reforestar con el uso de plántulas de Pinus radiata a un distanciamiento de 3m x 3 m a fin de establecer nuevamente el sistema de uso del suelo, propiciando la generación de beneficios ecológicos, económicos y sociales al aplicar criterios de manejo sustentable para la gestión de los recursos forestales del predio evaluado.

Surface and Subsurface Quality Evaluation of Engineered Wood Products by Ultrasonic Means

2014 ◽  
pp. 182-220
Author(s):  
Frank C. Beall ◽  
Henrique Reis
Keyword(s):  
Product Development ◽  
Material Properties ◽  
Rapid Evolution ◽  
Solid Wood ◽  
Wood Products ◽  
Assessment And Evaluation ◽  
Engineered Wood Products ◽  
Engineered Wood ◽  
History Of ◽  
Ultrasonic Techniques

The use of ultrasonic techniques to evaluate the properties of engineered wood-based materials is discussed with respect to research to date and the use of more advanced techniques. The latter is critical because of the rapid evolution from solid wood to reconstituted structural materials. In addition, although considerable research has been done, there have been few introductions into manufacturing. This chapter traces the history of the use and latest developments of ultrasonics in several key areas, particularly the measurement of adhesive curing and quality in composites and laminates, and detection of flaws in solid wood materials. The techniques reviewed apply to product development, material properties, process control, product quality assessment, and evaluation of products in service.

Sign in / Sign up

Export Citation Format

Share Document