Geographical variations of lumber quality of Larix sibirica naturally grown in five different provenances of Mongolia

Tumenjargal, Bayasaa; Ishiguri, Futoshi; Aiso-Sanada, Haruna; Takahashi, Yusuke; Nezu, Ikumi; Baasan, Bayartsetseg; Ohshima, Jyunichi; Yokota, Shinso

doi:10.1186/s10086-019-1823-3

Cited by 5 publications

(37 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Lumber production Figure 1 shows the experimental procedures used in the present study. A total of 111 logs were obtained from 25 trees (from 3 to 6 logs per tree) harvested from five different natural forests in Mongolia [18,27]. The logs were sawn into as many 100-by-50 mm cross-sections as possible.…”

Section: Methodsmentioning

confidence: 99%

“…The logs were sawn into as many 100-by-50 mm cross-sections as possible. A total of 190 pieces of lumber were thus obtained from the logs [18]. The lumber was air-dried in a laboratory without an air conditioner or heater in Ulaanbaatar, Mongolia, for 1 year, and the lumber was then planed into 38-by-89 mm cross-sections [18].…”

Section: Methodsmentioning

confidence: 99%

“…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. Significant differences were found in the wood and the bending properties of the lumber between the provenances [18,27]. However, there are limited available data on the characteristic values of the bending properties of dimension lumber for this species grown in Mongolia.…”

Section: Introductionmentioning

confidence: 99%

“…The mechanical properties of lumber vary considerably, because it is a natural material. Numerous studies have focused on mechanical properties, especially the modulus of elasticity (MOE) and modulus of rupture (MOR) in bending for structural lumber sawn from softwood species grown in plantations and natural forests [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Characteristic values, such as the lower tolerance limits of the MOE and MOR, are very important for structural lumber in construction [10,13,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…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%

See 4 more Smart Citations

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

et al. 2020

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

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

Self Cite

View full text Add to dashboard Cite

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...

show abstract

Predicting the bending properties of Larix sibirica lumber using nondestructive-testing methods

Tumenjargal

Ishiguri

Takahashi

et al. 2020

International Wood Products Journal

Self Cite

View full text Add to dashboard Cite

This study aims to investigate whether it is possible to predict the modulus of elasticity (MOE) and modulus of rupture (MOR) of lumber produced from different heights using the stress-wave velocity of standing trees or the dynamic Young's modulus of logs in Siberian larch (Larix sibirica). A total of 190 pieces of lumber (38 by 89 mm in cross section) were cut from 111 logs obtained from 25 standing trees. Significant positive correlation coefficients were found between the stress-wave velocity of standing trees and MOE (r = 0.776) and MOR (r = 0.702) of this lumber. The dynamic Young's modulus of the logs also correlated significantly with MOE (r = 0.745) and MOR (r = 0.584) values. The results obtained in the present study suggest that stress-wave velocity and dynamic Young's modulus are useful for selecting superior trees in tree breeding and sorting logs for producing structural lumber.

show abstract

Geographical variations of lumber quality of Larix sibirica naturally grown in five different provenances of Mongolia

Cited by 5 publications

References 10 publications

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

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

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

Predicting the bending properties of Larix sibirica lumber using nondestructive-testing methods

Contact Info

Product

Resources

About