Radial variations of wood properties in Casuarina equisetifolia growing in Bangladesh

Chowdhury, Md. Qumruzzaman; Ishiguri, Futoshi; Iizuka, Kazuya; Takashima, Yuya; Matsumoto, Kahoru; Hiraiwa, Tokiko; Ishido, M.; Sanpe, Hiroyuki; Yokota, Shinso; Yoshizawa, Nobuo

doi:10.1007/s10086-008-1004-2

Cited by 35 publications

(22 citation statements)

References 7 publications

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“…The wood density was demonstrated to be a very important factor accounting for the radial variation of bonding strength. Similar significant correlations were found between air-dried density and the compression strength parallel to the grain of Casuarina equisetifolia (Chowdhury et al 2009), as well as between the wood density obtained from soft X-ray analysis with Young's modulus and strength in static bending, compressive Young's modulus, compressive strength, and compressive proportional limit (Kubojima et al 2008).…”

Section: Radial Variation In Wood Density and Its Correlation With Shear Strengthsupporting

confidence: 73%

Radial variation in bonding performance of preservative-treated wood within Pinus elliottii trees and its relationships with wood density and adhesive penetration

Qin

DongShan

et al. 2021

BioRes

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Pinus elliottii wood from different radial locations within trees was used to prepare two-layer preservative-treated wood joints with alkaline copper quaternary preservative and emulsion polymer isocyanates (EPI) or resorcinol-phenol-formaldehyde (RPF) adhesives. The radial variations in shear strength and wood failure percentage were analyzed. Radial variations in wood density and average penetration depth (AP) of adhesives were investigated to establish relationships between shear strengths and characteristics of bonded joints. The shear strengths of EPI- and RPF-bonded joints showed similar increasing trends from pith to bark, and they varied in ranges of 2.92 to 8.13 MPa and 2.03 to 7.12 MPa, respectively. The wood failure percentage of EPI joints (93% to 100%) had no significant differences in all the radial locations, but that of RPF joints (60% to 100%) showed a clear decreasing trend from pith to bark. High positive linear correlations were found between the shear strengths and wood density, and Pearson’s correlation coefficients for EPI and RPF were 0.934 (p < 0.01) and 0.931 (p < 0.01), respectively. Wood density is a very important factor influencing radial variations of bonding strengths. The correlation between the AP and shear strength was not significant at the 0.05 level.

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Section: Radial Variation In Wood Density and Its Correlation With Shear Strengthsupporting

confidence: 73%

Radial variation in bonding performance of preservative-treated wood within Pinus elliottii trees and its relationships with wood density and adhesive penetration

Qin

DongShan

et al. 2021

BioRes

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“…Thus, MOE and MOR values for the 10th and 30th annual rings from the pith were estimated from the logarithmic formula fitted to the radial variation of MOE and MOR in each tree. The annual ring numbers of the specimens were estimated from the radial variations of annual ring width 33 according to the method described in our previous reports 39 – 41 .…”

Section: Methodsmentioning

confidence: 99%

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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“… Casuarina equisetifolia Forst. is used as an industrial raw material and wood fuel, as well as for conservation of coastal ecosystems and for agricultural land protection against salinity intrusion ( Hossain et al 1998 ; Chowdhury et al 2009 ). In China, Casuarina equisetifolia is widely planted in the coastal areas of Guangxi, Guangdong, Fujian, Hainan and Taiwan provinces.…”

Section: Introductionmentioning

confidence: 99%

Morphological and molecular identification of two new Ganoderma species on Casuarina equisetifolia from China

Xing¹,

Sun²,

Han³

et al. 2018

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Ganoderma is a cosmopolitan white rot fungal genus, famous for its medicinal properties. In the present study, two new Ganoderma species were collected from south-eastern China and described on the basis of morphological characters and phylogenetic analyses of sequences of the internal transcribed spacer (ITS) region, the translation elongation factor 1-α gene (EF1-α) and the second subunit of RNA polymerase II (RPB2). Specimens of both species were found on living trees of Casuarina equisetifolia. Ganoderma angustisporum sp. nov. is characterised by its sessile basidiomata and almond-shaped, slightly truncate, narrow basidiospores (9–11.3 × 4–5.2 µm). Ganoderma casuarinicola sp. nov. is characterised by its strongly laccate reddish-brown pileal surface, luminous yellow to yellowish-brown cutis and ellipsoid, truncate basidiospores (9–10.2 × 5–6 µm). The two new species are compared with their related taxa. Phylogenetic analyses confirmed that G. angustisporum and G. casuarinicola are distinct species within Ganoderma.

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Radial variations of wood properties in Casuarina equisetifolia growing in Bangladesh

Cited by 35 publications

References 7 publications

Radial variation in bonding performance of preservative-treated wood within Pinus elliottii trees and its relationships with wood density and adhesive penetration

Radial variation in bonding performance of preservative-treated wood within Pinus elliottii trees and its relationships with wood density and adhesive penetration

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

Morphological and molecular identification of two new Ganoderma species on Casuarina equisetifolia from China

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