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Articles containing the keyword 'compressive strength'.

Category: Research article

article id 10284, category Research article
Togtokhbayar Erdene-Ochir , Futoshi Ishiguri, Ikumi Nezu, Bayasaa Tumenjargal, Bayartsesteg Baasan, Ganbaatar Chultem, Jyunichi Ohshima, Shinso Yokota. (2020). Utilization potential of naturally regenerated Mongolian Betula platyphylla wood based on growth characteristics and wood properties. Silva Fennica vol. 54 no. 3 article id 10284. https://doi.org/10.14214/sf.10284
Highlights: Wood with high density and high compressive strength can be obtained near to the bark of Betula platyphylla trees; Basic density of B. platyphylla wood may be predicted by the stress-wave velocity of stems; Growth characteristics are positively correlated with stress-wave velocity and basic density; Early evaluation of basic density is possible when using the wood at 2 cm from the pith: A significant between-site variation was found in the basic density at the position from the 1st to the 15th annual ring from the pith; Wood from B. platyphylla trees grown in Mongolia may be used for industrial products equally to the same species in other countries.

To preliminary evaluate the potential wood utilization of Betula platyphylla Sukaczev trees naturally regenerated in Mongolia, growth characteristics (stem diameter and tree height), wood properties (annual ring width, basic density, and compressive strength parallel to grain at the green condition) of core samples, and stress-wave velocity in stems were investigated for Betula platyphylla trees grown naturally in three different sites in Selenge, Mongolia. Betula platyphylla trees, naturally grown in Nikko, Japan, were also examined to compare wood properties between the two regions. The mean values of stem diameter, tree height, stress-wave velocity of stems, annual ring width, basic density, and compressive strength parallel to grain at green condition in Mongolian B. platyphylla were 17.6 cm, 14.1 m, 3.50 km s–1, 1.27 mm, 0.51 g cm–3, and 20.4 MPa, respectively. Basic density and compressive strength were decreased first from the pith, and then gradually increased toward the bark. The wood properties of B. platyphylla trees grown naturally in Mongolia were similar to those in B. platyphylla trees grown in Japan. Growth characteristics, especially stem diameter, were positively correlated with the stress-wave velocity of stems and basic density. Early evaluation of basic density in B. platyphylla trees is possible by using wood located 2 cm from the pith. Basic density at the position from the 1st to the 15th annual ring from the pith showed significant between-site differences in Mongolian B. platyphylla. Based on the results, it is concluded that the wood of B. platyphylla trees grown in Mongolia may be used for industrial products as well as those from similar species in other countries.

  • Erdene-Ochir , School of Agriculture, Utsunomiya University, Utsunomiya, Tochigi 321-8505, Japan; United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan; Training and Research Institute of Forestry and Wood Industry, Mongolian University of Science and Technology, Ulaanbaatar 14191, Mongolia ORCID ID:E-mail: togtokhbayarerdeneochir@gmail.com
  • Ishiguri, School of Agriculture, Utsunomiya University, Utsunomiya, Tochigi 321-8505, Japan ORCID ID:E-mail: ishiguri@cc.utsunomiya-u.ac.jp (email)
  • Nezu, School of Agriculture, Utsunomiya University, Utsunomiya, Tochigi 321-8505, Japan ORCID ID:E-mail: zoo-sk3.primo@outlook.jp
  • Tumenjargal, School of Agriculture, Utsunomiya University, Utsunomiya, Tochigi 321-8505, Japan; United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan; Training and Research Institute of Forestry and Wood Industry, Mongolian University of Science and Technology, Ulaanbaatar 14191, Mongolia ORCID ID:E-mail: t_bayasaa88@yahoo.com
  • Baasan, Training and Research Institute of Forestry and Wood Industry, Mongolian University of Science and Technology, Ulaanbaatar 14191, Mongolia ORCID ID:E-mail: bayartsetseg@must.edu.mn
  • Chultem, Training and Research Institute of Forestry and Wood Industry, Mongolian University of Science and Technology, Ulaanbaatar 14191, Mongolia ORCID ID:E-mail: ganbaatar_ch@must.edu.mn
  • Ohshima, School of Agriculture, Utsunomiya University, Utsunomiya, Tochigi 321-8505, Japan ORCID ID:E-mail: joshima@cc.utsunomiya-u.ac.jp
  • Yokota, School of Agriculture, Utsunomiya University, Utsunomiya, Tochigi 321-8505, Japan ORCID ID:E-mail: yokotas@cc.utsunomiya-u.ac.jp

Category: Article

article id 5128, category Article
Paavo J. Ollinmaa. (1981). Eräistä ojitetuilla soilla kasvaneen puun fysikaalisista ominaisuuksista. Silva Fennica vol. 15 no. 3 article id 5128. https://doi.org/10.14214/sf.a15069
English title: Physical properties of wood growing on drained swamps.

The objective of the investigation was to determine the differences between timber grown on a peatland before and after draining, in respect of compressive strength parallel to the grain, static bending strength and density. In addition, the characteristics of boundary zone between the wood formed before, and after the draining with wider growth rings was studied. 41 Scots pine (Pinus sylvestris L.) and 22 Norway spruce (Picea abies (L.) H. Karst.) trees were studied.

The compressive strength of pine usually decreased from the butt end upwards, but no trend was observed in spruce wood. In coniferous trees, wide-ringed wood formed subsequent to draining was slightly lighter than the close-ringed wood produced prior the draining. The density of pine as well as spruce increases as the width of the growth rings decrease up to a certain limit. The strength of the different kinds of wood seems to decrease from the butt end upwards.

In both species, the compressive strength parallel to the grain and the bending strength are lowest in such wood that contains exclusively wide-ringed wood formed subsequent to draining. Also, compressive and bending strength increase with decreasing width of the growth rings. The longitudinal shrinkage of compression wood in spruce was several times that of normal wood, and the bending strength was lower than that of normal wood particularly in spruce. The compressive strength parallel to the grain in dry condition was, however, higher than in normal wood both in pine and spruce.

The PDF includes a summary in English.

  • Ollinmaa, ORCID ID:E-mail:

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