Modeling of radial variations in wood properties and comparison of juvenile and mature wood of four common conifers in Mongolia

Sarkhad, Murzabyek; Ishiguri, Futoshi; Nezu, Ikumi; Tumenjargal, Bayasaa; Takahashi, Yusuke; Baasan, Bayartsetseg; Ohshima, Jyunichi; Yokota, Shinso

doi:10.1515/hf-2021-0107

Cited by 8 publications

(14 citation statements)

References 20 publications

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“…As a result, the mean values of annual ring width, basic density, MOE, MOR, and compressive strength were 1.8 mm, 0.40 g/cm 3 , 5.35 GPa, 65.1 MPa, and 28.4 MPa, respectively (Table 4). Except for MOE, these estimated values were similar to those previously obtained in juvenile wood harvested from trees naturally grown in Mongolia (Sarkhad et al 2022). Thus, we conclude that wood obtained from plantation-grown P. sylvestris is not always of lower quality compared to wood from natural forests in Mongolia.…”

Section: Resultssupporting

confidence: 87%

“…sic density, 9.41 GPa (96 tonf/cm 2 ) for MOE, 81.7 MPa (833 kgf/cm 2 ) for MOR, and 42.7 MPa (435 kgf/cm 2 ) for compressive strength, respectively. Sarkhad et al (2022) also reported that the basic density, MOE, MOR, and compressive strength of juvenile wood (wood up to about 20 th annual ring from pith) in P. sylvestris trees grown in a natural forest in Mongolia were 0.37 g/cm 3 , 7.64 GPa, 69.4 MPa, and 30.5 MPa, respectively. To compare with previous data, mean values up to the 20 th annual ring from the pith were estimated using obtained fixed-effect models for radial variations (Table 4).…”

Section: Resultsmentioning

confidence: 90%

“…Statistical analysis was conducted using R software environment, version 4.0.3 (R Core Team 2020). To evaluate the radial variations of wood properties (basic density, MOE, MOR, and compressive strength), the following mixed-effect models with a random effect of growth categories were developed by using the lmer function in lme4 packages and lmerTest packages (Bates et al 2015) and the nlme function in the nlme package (Pinheiro and Bates 2000) according to our previous reports (Nezu et al 2022, Sarkhad et al 2022:…”

Section: Discussionmentioning

confidence: 99%

“…The southern border between the Siberian boreal forests and the Central Asian dry steppes is located in the northern part of Mongolia (Mühlenberg et al 2012). Forestry in Mongolia has mainly relied on natural forest resources (Tumenjargal et al 2018, Sarkhad et al 2022). Thus, wood properties have mainly been assessed in coniferous species found in natural forests, such as Larix sibirica, Pinus sylvestris, Pinus sibirica, Picea obovata, and others (Ishiguri et al 2018, Sarkhad et al 2022.…”

Section: Introductionmentioning

confidence: 99%

“…Forestry in Mongolia has mainly relied on natural forest resources (Tumenjargal et al 2018, Sarkhad et al 2022). Thus, wood properties have mainly been assessed in coniferous species found in natural forests, such as Larix sibirica, Pinus sylvestris, Pinus sibirica, Picea obovata, and others (Ishiguri et al 2018, Sarkhad et al 2022. On the other hand, efforts have also been made to establish plantations in Mongolia (Sukhbaatar et al 2020, Ganbaatar et al 2021.…”

Section: Introductionmentioning

confidence: 99%

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Effects of radial growth rate on juvenile wood properties of Pinus sylvestris planted in Mongolia

et al. 2023

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The establishment of forest plantations in boreal zones in Mongolia is important for wood production as well as carbon dioxide fixation. The present study aims to elucidate the juvenile wood properties (basic density, modulus of elasticity [MOE], modulus of rupture [MOR], and compressive strength parallel to grain) of plantation-grown Pinus sylvestris to promote the establishment of plantations. In addition, the effect of the radial growth rate on wood properties was also evaluated using a linear mixed-effects model. In the juvenile wood phase, wood properties were increased from the pith to bark side based on the results of model selections. Up to the 20th annual ring from the pith, the estimated mean values of basic density, MOE, MOR, and compressive strength were 0.40 g/cm3, 5.35 GPa, 65.1 MPa, and 28.4 MPa, respectively. Variance component ratios of growth categories were low in wood properties, with the exception of basic density, suggesting that the radial growth rate did not affect wood properties in the juvenile wood phase in this species growing in Mongolia. Based on the results obtained in the present study, we have concluded that although basic density in the faster growth category yielded relatively lower values, appropriate radial growth promotion during the initial stage of growth in P. sylvestris trees planted in Mongolia exerted no negative impact on juvenile wood properties. Keywords: annual ring width, basic density, compressive strength, modulus of elasticity, modulus of rupture

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of radial growth rate on juvenile wood properties of Pinus sylvestris planted in Mongolia

et al. 2023

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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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A Review of Progress and Applications in Wood Quality Modelling

Drew

Downes²,

Seifert

et al. 2022

Curr Forestry Rep

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Modeling of radial variations in wood properties and comparison of juvenile and mature wood of four common conifers in Mongolia

Cited by 8 publications

References 20 publications

Effects of radial growth rate on juvenile wood properties of Pinus sylvestris planted in Mongolia

Effects of radial growth rate on juvenile wood properties of Pinus sylvestris planted in Mongolia

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

A Review of Progress and Applications in Wood Quality Modelling

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