Clonal variations and effects of juvenile wood on lumber quality in Japanese larch

Tumenjargal, Bayasaa; Ishiguri, Futoshi; Iki, Taiichi; Takahashi, Yusuke; Nezu, Ikumi; Otsuka, Kouhei; Ohshima, Jyunichi; Yokota, Shinso

doi:10.1080/17480272.2020.1779809

Cited by 7 publications

(4 citation statements)

References 11 publications

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“…Larix species are one of the most productive forestry species in North America 1 – 4 , Europe 5 – 12 , Japan 13 – 24 , and China 25 , 26 . To date, several studies have focused on geographic variations in the physical and mechanical properties of wood in Larix species to determine effective wood utilization and conduct appropriate tree breeding programs 1 , 3 – 5 , 15 , 18 , 19 , 23 , 24 . For example, geographic variations have been found in the physical and mechanical properties of wood in Larix kaempferi 1 , 4 .…”

Section: Introductionmentioning

confidence: 99%

“…A similar tendency was also found for another Larix species, Larix sibirica 5 . In addition to geographic and/or genetic variations in the physical and mechanical properties of wood, radial variations should also be considered for effective wood utilization 11 , 12 , 23 – 25 , 27 .…”

Section: Introductionmentioning

confidence: 99%

“…In general, softwood can be classified as juvenile or mature wood. Juvenile wood is characterized by a greater microfibril angle, a lower basic density, and inferior mechanical properties compared to mature wood 12 – 15 , 17 , 23 , 24 , 26 , 28 , 29 . In a study of 31-year-old L. kaempferi trees, wood density and wood mechanical properties, such as modulus of elasticity (MOE), modulus of rupture (MOR), compressive strength parallel to grain (CS), and shearing strength (SS), showed lower values in corewood (from the pith to the 15th annual ring) than in outer wood (from the 15th annual ring to the bark) 24 .…”

Section: Introductionmentioning

confidence: 99%

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Physical and mechanical properties of wood and their geographic variations in Larix sibirica trees naturally grown in Mongolia

Tumenjargal

Ishiguri

Aiso³

et al. 2020

Sci Rep

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We examined the physical and mechanical properties of wood in Siberian larch (Larix sibirica) trees that grow naturally in five Mongolian provenances (Khentii, Arkhangai, Zavkhan, Khuvsgul, and Selenge) and the geographic variations between them. Five trees with stem diameters of 20 to 30 cm at 1.3 m above ground were collected from each provenance. The mean values of the modulus of elasticity (MOE), modulus of rupture (MOR), compressive strength parallel to grain (CS), and shearing strength (SS) ranged from 7.03 to 9.51 GPa, 79.8 to 103.9 MPa, 46.3 to 51.1 MPa, and 10.4 to 13.0 MPa, respectively. Significant differences were found in radial and tangential shrinkage, MOE, MOR, and SS in wood among the five provenances. In addition, juvenile wood had inferior physical and mechanical properties in comparison to mature wood within and among provenances. Furthermore, there were significant differences in all examined properties, except for CS, in mature wood among the five provenances. Higher correlation coefficients were also obtained in mature wood among all mechanical properties, except for SS. Larix species are one of the most productive forestry species in North America 1-4 , Europe 5-12 , Japan 13-24 , and China 25,26. To date, several studies have focused on geographic variations in the physical and mechanical properties of wood in Larix species to determine effective wood utilization and conduct appropriate tree breeding programs 1,3-5,15,18,19,23,24. For example, geographic variations have been found in the physical and mechanical properties of wood in Larix kaempferi 1,4. A similar tendency was also found for another Larix species, Larix sibirica 5. In addition to geographic and/or genetic variations in the physical and mechanical properties of wood, radial variations should also be considered for effective wood utilization 11,12,23-25,27. In general, softwood can be classified as juvenile or mature wood. Juvenile wood is characterized by a greater microfibril angle, a lower basic density, and inferior mechanical properties compared to mature wood 12-15,17,23,24,26,28,29. In a study of 31-year-old L. kaempferi trees, wood density and wood mechanical properties, such as modulus of elasticity (MOE), modulus of rupture (MOR), compressive strength parallel to grain (CS), and shearing strength (SS), showed lower values in corewood (from the pith to the 15th annual ring) than in outer wood (from the 15th annual ring to the bark) 24. Therefore, based on the nature of Larix species, (1) trees of these species with superior physical and mechanical properties of wood can be selected, and (2) the properties of juvenile wood should be considered for determining effective wood utilization. In Mongolia, the total forest area is 18.3 million ha, covering 11.9% of the country 30. Of this total area, Larix sibirica covers more than 70% of the forest. Since wood produced from Larix species is mainly utilized for structural applications, sawmilling is one of the main forest activities in Mongolia. Indeed, L. sibirica is the m...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Physical and mechanical properties of wood and their geographic variations in Larix sibirica trees naturally grown in Mongolia

Tumenjargal

Ishiguri

Aiso³

et al. 2020

Sci Rep

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“…On the other hand, the genetic correlation between wood density and stress wave velocity has been reported to be strong in other coniferous species such as P. radiata, Picea abies (L.) Karst., and L. kaempferi (Apiolaza 2009;Chen et al 2015;Fukatsu et al 2015). Additionally, a positive correlation has been reported between dynamic modulus of elasticity and wood density in L. kaempferi (Ishiguri et al 2008;Nakada et al 2005;Tumenjargal et al 2020). These findings suggest that the relationship between dynamic modulus of elasticity and wood density differs depending on tree species.…”

Section: Efficiency Of Nondestructive Measurement Of Wood Propertiesmentioning

confidence: 89%

Genetic gains in wood property can be achieved by indirect selection and nondestructive measurements in full-sib families of Japanese cedar (Cryptomeria japonica. D. Don) plus tree clones

Yasuda

Iki

Takashima

et al. 2021

Annals of Forest Science

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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How thermal treatment affects the chemical composition and the physical, mechanical and swelling properties of Scots pine juvenile and mature wood

Broda,

Popescu,

Poszwa

et al. 2024

Wood Sci Technol

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High variations in juvenile wood properties in the radial direction and its worse performance than mature wood make it less suitable for some applications and often treated as waste material. This study aimed to assess how thermal modification affects the chemical composition and the physical, mechanical and swelling properties of Scots pine juvenile and mature wood. An additional goal was to evaluate if the modification can equalise the differences in selected properties of juvenile wood to those of mature wood so that from waste material, juvenile wood can become a fully-fledged raw material for various industrial applications. Thermal treatment at 220 °C influenced wood chemical composition, degrading mainly hemicelluloses but also affecting cellulose and lignin, which resulted in a reduction of hydroxyls and carbonyl/carboxyl groups. These changes were more pronounced for mature than juvenile wood. It reduced mass loss and swelling rate, and increased swelling pressure in the tangential and radial directions to a higher degree for juvenile than mature wood. Changes in mechanical properties in compression were statistically significant only for mature wood, while wood hardness remained unaffected. Although the applied heat treatment improved the performance of juvenile wood by reducing its swelling rate, it did not equalise the examined properties between juvenile and mature wood. Since higher juvenile wood proportion is expected in the wood supply from the future intensively managed forests, there is still a need to find suitable modification methods or better processing techniques so that instead of being thrown away as waste, it could be used broadly in various industrial applications.

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Clonal variations and effects of juvenile wood on lumber quality in Japanese larch

Cited by 7 publications

References 11 publications

Physical and mechanical properties of wood and their geographic variations in Larix sibirica trees naturally grown in Mongolia

Physical and mechanical properties of wood and their geographic variations in Larix sibirica trees naturally grown in Mongolia

Genetic gains in wood property can be achieved by indirect selection and nondestructive measurements in full-sib families of Japanese cedar (Cryptomeria japonica. D. Don) plus tree clones

How thermal treatment affects the chemical composition and the physical, mechanical and swelling properties of Scots pine juvenile and mature wood

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