Wood properties of <i>Larix sibirica</i> naturally grown in Tosontsengel, Mongolia

Ishiguri, Futoshi; Tumenjargal, Bayasaa; Baasan, Bayartsetseg; Jigjjav, Ayursed; Pertiwi, Yus Andhini Bhekti; Aiso-Sanada, Haruna; Takashima, Yuya; Iki, Taiichi; Ohshima, Jyunichi; Iizuka, Kazuya; Yokota, Shinso

doi:10.1080/20426445.2018.1506606

Cited by 11 publications

(19 citation statements)

References 17 publications

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“…The mean SS was higher than that of L. sibirica planted in Finland 9 and L. kaempferi planted in Japan 24 . In the radial variation, similar radial trends were found in L. sibirica that grow naturally in Mongolia 27 and in L. kaempferi planted in Japan 22 .…”

Section: Discussionsupporting

confidence: 71%

“…These results indicated that the effect of cold-or hot-water extractives on wood density might be greater in L. sibirica compared to other Larix species. www.nature.com/scientificreports/ Ishiguri et al 27 reported that radial shrinkage at 1% moisture content change showed almost constant values from pith to bark, whereas tangential shrinkage increased up to 4 cm from pith and then became constant at around 0.3%. The mean values and radial variation patterns examined in this study for shrinkage in both the radial and tangential directions in L. sibirica were similar to those of L. sibirica examined by Ishiguri et al 27 .…”

Section: Discussionmentioning

confidence: 99%

“…Specimens (ca. 20 (R) × 20 (T) × 40 (L) mm) for the compressive test were obtained from the specimens used for the bending test that did not have any visual defects 22,27 . The number of specimens used for the compressive test was the same as used for the bending test.…”

Section: Methodsmentioning

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: Discussionsupporting

confidence: 71%

Section: Discussionmentioning

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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“…In addition, the relationships between wood density and MOR might be affected by presence of large amounts of arabinogalactan in the species. In the previous study [26], we reported that arabinogalactan might be included in hotwater extracts in heartwood of L. sibirica, and the content of hot-water extracts was 14.1%. Thus, it is considered that wood density including arabinogalactan in this species resulted in overestimation of wood density values.…”

Section: Correlations Between Lumber Propertiesmentioning

confidence: 85%

“…In Mongolia, Siberian larch (Larix sibirica Ledeb.) is a major softwood species, and wood from this species is mainly used for structural lumber in construction due to its high mechanical strength properties [18,19,26]. We previously examined the geographical variations of wood properties and the quality of dimension lumber (2 by 4 lumber) for L. sibirica collected from five different provenances in Mongolia.…”

Section: Introductionmentioning

confidence: 99%

Bending properties of dimension lumber produced from Siberian larch (Larix sibirica) in Mongolia

et al. 2020

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The modulus of elasticity (MOE) and modulus of rupture (MOR) were evaluated for 190 pieces of dimension lumber (2 by 4 lumber, 38 by 89 mm in cross-section) produced from Larix sibirica trees grown in Mongolia. The 5% tolerance limits of the MOE and MOR were 5.70 GPa and 15.1 MPa, respectively. The value of the 5% tolerance limit of the MOR exceeded the characteristic value of 2 by 4 lumber in visual grading class No. 3 of the Japanese Agricultural Standard for the D. fir-L, Hem-Tam, JS-III and S-P-F softwood species groups. A significant positive correlation was found between the MOE and MOR, although air-dry density was weakly correlated with bending properties in L. sibirica.

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Log characteristics and basic density of four common Mongolian softwoods

Sarkhad

Ishiguri

Nezu

et al. 2022

International Wood Products Journal

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Log characteristics and basic density were evaluated in four common Mongolian softwoods, Pinus sylvestris L., Pinus sibirica Du Tour, Picea obovata Ledeb., and Larix sibirica Ledeb. by developing the linear or nonlinear mixed-effects models for longitudinal and radial variations of measured characteristics. Total of 19 trees from four species were used in this study. Log taper and juvenile wood percentage increased from base to treetop in all species, except for log taper in Pinus sylvestris. Dynamic young's modulus of logs decreased from base to treetop, and the mean values were 7.81, 5.74, 7.12, and 8.78 GPa for Pinus sylvestris, Pinus sibirica, Picea obovata, and Larix sibirica, respectively. Basic density increased (Pinus sylvestris and Larix sibirica) or decreased (Pinus sibirica and Picea obovata) and then became stable values. The estimated whole tree values of basic density in juvenile wood significantly differed from those in mature wood for all species.

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Wood properties of Larix sibirica naturally grown in Tosontsengel, Mongolia

Cited by 11 publications

References 17 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

Bending properties of dimension lumber produced from Siberian larch (Larix sibirica) in Mongolia

Log characteristics and basic density of four common Mongolian softwoods

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