Shinso Yokota

Shinso Yokota
Utsunomiya University · Department of Forest Science

PhD

About

228
Publications
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Publications

Publications (228)
Article
Amounts of wood chemical components (organic solvent extracts, Klason lignin, and holocellulose) and kraft pulp characteristics (yield and kappa number) were directly determined for 32 trees from eight half-sib Eucalyptus camaldulensis Dehnh. families in second generation of elite trees selected in Thailand. The mean values of all trees were 1.4 %...
Article
Full-text available
Key message Xylem maturation depends on cambial age rather than diameter growth in Shorea macrophylla by the model selections for radial variations in cell length, wood fiber traits, and basic density. AbstractRadial variations in anatomical characteristics and wood properties were investigated in 23-year-old Shorea macrophylla (engkabang) trees pl...
Article
Japanese larch ( Larix kaempferi ) is an important plantation species in Japan as well as in Europe. The inheritance of wood color ( L *, a * and b *), mass loss by a white-rot fungus ( Trametes versicolor ) and a brown-rot fungus ( Fomitopsis palustris ), and polyphenol content (as the taxifolin equivalent) in heartwood were examined for 75 trees...
Article
To utilize wood resources in Mongolia, amounts of wood chemical components (hot-water extracts, 1% NaOH extracts, ethanol-toluene extracts, holocellulose, -, -, and -cellulose, Klason lignin, and ash) were determined in four common Mongolian softwoods, Pinus sylvestris, Pinus sibirica, Picea obovata, and Larix sibirica. In addition, decay resist...
Article
Wood properties, such as annual ring width, wood fiber length, vessel element length, basic density, air-dry density, dynamic Young’s modulus, modulus of elasticity (MOE), modulus of rupture (MOR), absorbed energy in impact bending, compressive strength parallel to grain, and shearing strength, were investigated for wood from 10 naturally regenerat...
Article
Pinus sylvestris L., Pinus sibirica Du Tour, Picea obovata Ledeb., and Larix sibirica Ledeb. are important forest tree species in Mongolia. The radial variations of wood anatomical characteristics, physical and mechanical properties were evaluated by linear or nonlinear mixed-effects models for effective wood utilization of those of conifers. Many...
Preprint
Full-text available
Inonotus obliquus is pathogenic fungus on living trees and has been widely used as a traditional medicine for cancer therapy. Although it has been reported that lignocellulose-degrading enzymes are involved in the early stage of host infection, the parasitic life cycle of this fungus has not been fully clarified. In the present study, we investigat...
Article
Longitudinal wood decay progress was investigated for Sugi (Cryptomeria japonica (Thunb. ex L.f.) D. Don) trees 5 years after bark-stripping by Japanese black bear (Ursus thibetanus japonicus Schlegel). Longitudinal variation of dynamic Young's modulus was unclear in all individuals. Longitudinal variation of moisture content in all bark-stripped t...
Article
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Hypocotyl and internodal explants were collected from in vitro grown seedlings and in vitro proliferated shoots, respectively. Callus induction and subsequent plant regeneration were established from those explants. Friable callus with somatic embryo-like structure (ELS) developed from hypocotyl and internodal explants on Murashige and Skoog (MS) m...
Article
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Pine wilt disease is one of the most serious tree diseases occurring worldwide. Clones of Pinus densiflora Siebold et Zucc with pine wood nematode resistance were selected. In addition to resistance, wood quality is also an important criterion in the breeding program of P. densiflora because of its use as construction lumber. However, little inform...
Article
Full-text available
Sustainable pulpwood production from fast-growing tree plantations is needed for pulp and paper industries. To increase the pulpwood production efficiency, the anatomical characteristics and derived-wood properties of 75 trees from 15 half-sib families of Eucalyptus camaldulensis Dehnh. planted in Thailand were investigated, and then the family was...
Article
Wood properties were investigated for nine naturally regenerated trees of Betula platyphylla Sukaczev var. japonica (Miq.) H. Hara in Nikko, Japan to effectively utilise the wood resources. The following properties were determined: stress-wave velocity of stems in radial direction, cell length, basic density, shrinkage, dynamic Young’s modulus, mod...
Article
Full-text available
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 exceede...
Article
Full-text available
The quality of dimension lumber (2 by 4 lumber) was preliminarily investigated in four common Mongolian softwoods: Pinus sylvestris L., Pinus sibirica Du Tour, Picea obovata Ledeb., and Larix sibirica Ledeb. to produce high quality dimension lumber for structural use. In total 61, 39, 67, and 37 pieces of lumber were prepared for Pinus sylvestris,...
Article
Full-text available
Community forests in Indonesia are important suppliers of wood resources for the wood industry. In the present study, stress-wave velocity of stems, log characteristics (taper, green density, and dynamic Young’s modulus), and wood properties (basic density, compressive strength parallel to grain, modulus of elasticity [MOE], and modulus of rupture...
Article
Full-text available
To clarify inheritance of static bending properties in relation to elastic and plastic regions, air-dry density, microfibril angle of the S 2 layer in latewood tracheid (MFA), and static bending properties (modulus of elasticity [MOE], modulus of rupture [MOR] and bending work) were examined for juvenile wood of 18 full-sib families in 20-year-old...
Article
Full-text available
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...
Article
Wood properties, including Young’s modulus, differ among clones in Larix kaempferi; however, available information is still limited on among-clonal variations of lumber qualities in L. kaempferi. The objectives of this study were to clarify the clonal variations in lumber quality and to identify the effects of juvenile wood on lumber quality in L....
Article
Full-text available
The aims of this research were to analyse the bio-energy properties of tree branches and determine the appropriate conversion process for the fuel source use of each species. Bio-energy properties, such as proximate analysis, calorific value, firewood value index, and hydrolysis rate of wood, and chemical component content were evaluated for branch...
Article
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 sect...
Article
Full-text available
To preliminary evaluate the potential wood utilization of 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...
Article
Full-text available
To promote solid wood production, the diameter at breast height, height, stress-wave velocity, surface-released strain, basic density and compressive strength parallel to the grain were measured for 10 half-sib families of 12-year-old Eucalyptus camaldulensis Dehnh. trees growing in Thailand. Based on the results, growth rates, correlations among m...
Article
Full-text available
Annual ring width, warp, dynamic Young’s modulus, and static bending properties were evaluated for 2 × 4 lumber produced from Larix sibirica trees naturally grown in five different provenances of Mongolia. The lumber was also visually graded according to Japanese Agriculture Standard for structural lumber for wood frame construction. Mean values of...
Article
Full-text available
To clarify the effects of thinning on the growth and wood quality of Eucalyptus camaldulensis trees grown in Thailand, the growth characteristics, anatomical characteristics, and wood properties of T5 clones, which are used on plantations to produce pulpwood, were investigated. Core samples were collected from trees grown on both thinned and unthin...
Article
Full-text available
The aim of this study was to clarify the anatomical characteristics and predicted paper quality of Eucalyptus urophylla, E. grandis, and E. pellita planted in North Sumatra, Indonesia. In addition, potential hybridization among the three species was explored. The anatomical characteristics of the fiber (length, diameter, and wall thickness), vessel...
Article
Full-text available
β-Thujaplicin (hinokitiol) is an important extractive of Thujopsis dolabrata var. hondae (hinokiasunaro) that confers high durability to its wood. We investigated differences in β-thujaplicin content in wood from plantation- and naturally grown trees of T. dolabrata var. hondae, and also examined growth rate and wood density. A total of 29 trees we...
Chapter
To clarify the behavior of ¹³⁷Cs absorbed in the stem wood 5 years after the Fukushima Daiichi Nuclear Power Plant accident, ¹³⁷Cs concentration was measured in a radial direction, from sapwood to heartwood, in the stem wood of 33-year-old sugi (Cryptomeria japonica) trees. Understanding the mechanism of absorption and movement of ¹³⁷Cs to stem woo...
Article
Full-text available
Inonotus obliquus is a medicinal fungus in the family Hymenochaetaceae and commonly known as chaga. The sclerotium of this fungus has been used as a traditional medicine for long time. In this study, we present the mitochondrial genome sequence of I. obliquus. The mitochondrial DNA (mtDNA) is 119,110 base pairs in length and contained genes for 58...
Article
Full-text available
The anatomical characteristics and wood properties of Artocarpus species naturally regenerated in secondary forests in Central Kalimantan, Indonesia, were investigated to determine their usefulness as alternative wood resources. The following six Artocarpus species were used in the present study: A. dadah, A. nitidus, A. elasticus, A. tamaran, A. a...
Article
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Eucalyptus camaldulensis Dehnh. and E. globulus Labill. are economically important species for wood and pulpwood materials. Representative heights for assessing whole-tree values of cell-type proportions (vessels, fibers, ray and axial parenchyma percentages) using increment cores were examined by analysis of within-tree variations. Pattern differe...
Article
This study investigated the anatomical and chemical characteristics of the reaction wood of a gymnpsperm species, Gnetum gnemon, and discussed on contributing factor for the type of reaction wood in this species. Cell morphology, microfibril angle (MFA) of the S2 layer and lignin distribution in secondary walls of tracheary elements, and lignin con...
Conference Paper
Full-text available
Picea jezoensis wood block was degraded by a white-rot fungus (Porodaedalea pini) under laboratory condition for different periods up to 120 days. Chemical composition changes of the wood caused by white-rot fungus degradation were evaluated by Fourier Transform infrared (FTTR) spectroscopy. Additionally, discoloration of the wood meal was analyzed...
Article
The wood properties were examined for Larix sibirica naturally grown in Tosontsengel, Mongolia. The dynamic Young's modulus of the logs ranged from 6.31 to 9.65 GPa. The mean values of wood properties were as follows: water-extracted basic density = 0.44 g cm⁻³, air-dry density = 0.59 g cm⁻³, shrinkage at 1% moisture content change in the radial an...
Article
Radial variations in wood properties, cell morphologies and cell proportions were investigated for nine 4-year-old Neolamarckia cadamba trees planted in a community forest in East Java, Indonesia. The relationships between stem diameter and wood properties, cell morphologies or cell proportions were determined to ascertain the effects of stem diame...
Article
Full-text available
Genetic improvements in the mechanical properties of wood are important in forestry species used for lumber, such as Picea. The within-tree radial and among-family variations for the modulus of elasticity (MOE), modulus of rupture (MOR), and their related traits [i.e., microfibril angle (MFA) of the S2 layer in latewood tracheid and air-dry density...
Article
Full-text available
Geographic variations in growth, stress-wave velocity of stem, dynamic Young’s modulus of stems and logs, annual ring width, latewood percentage and basic density were investigated for (Münchh.) Ledeb. naturally grown in Mongolia. A total of 250 trees with 20 to 30 cm in stem diameter at a height of 1.3 m above ground level were selected from ea...
Article
The effect of radial growth rate on wood properties was evaluated for 7-year-old balsa trees grown in plantation forest in East Java, Indonesia. The standing trees in the experiment site in the plantation were categorised into three groups (slow-, medium-, and fast-growth) according to their stem diameter. Mean values of stem diameter, tree height,...
Article
To utilize forest resources in areas affected by fallout from the Fukushima Daiichi Nuclear Power Plant accident, it is important to understand the mechanisms of 137Cs movement through the stem wood of contaminated trees. Understanding the mechanism of absorption and migration of 137Cs to stem wood is necessary for clues to the future prediction of...
Article
Full-text available
Fast-growing tree species are being considered as an alternative source of timber to augment the supply in southern Asian countries. Eucalyptus is one of the most promising genus because its fast-growing characteristics and hybridization among species can produce superior characteristics valuable to both the pulp and timber industries. To evaluate...
Article
The objective of this study was to evaluate the properties for wood utilization of fruit trees planted in Central Kalimantan, Indonesia. A total of 9 jambu bol (Syzygium malaccense), rambutan (Nephelium lappaceum), and durian (Durio zibethinus) trees were randomly selected from the plot (20 by 30 m) and measured for stem diameter, tree height, stre...
Article
The present study clarified the relationship between the growth and wood properties of 54-year-old Agathis sp. trees planted in Indonesia. Stem diameter, pilodyn penetration, and stress-wave velocity (SWV) were measured for all trees (35 trees) in a plot (30  30 m) located almost at the center of a stand. Based on the mean stem diameter, 10 standa...
Article
Full-text available
Zelkova serrata (Thunb.) Makino)における材質育種の可能性を検討するために、千葉 県内に植栽された11系統の20年生ケヤキより得られた丸太の材質特性を調査した。生材含水率、容積密度、丸太 の曲げヤング率および曲げ強さの全系統の平均値は、 それぞれ56.3%、 0.61 g/cm 3 、 6.43 GPaおよび73.5 MPaであっ た。系統を要因とした一元配置の分散分析の結果、含水率を除くすべての材質特性において、比較的高いF値が 認められ、選抜育種による材質の改良の可能性が示唆された。また、胸高直径と曲げ強さを除くすべての材質特 性の間に有意な相関関係は認められなかったことから、成長の良好な個体であっても必ずしも材質特性が劣ら ない可能性が明らかとなった。さら...
Article
The objective of this study is to clarify the relationships between tree sizes and the anatomical, chemical, and physical characteristics of reaction wood. Naturally inclined stems or branches in 23 Japanese angiosperms, including 3 tree sizes at adult trees, 7 arbor, 7 subarbor, and 9 shrub species, were used. The presence of a gelatinous (G-) lay...
Article
Solid wood properties were examined in eight half-sib families of 4-year-old Eucalyptus camaldulensis trees selected for pulpwood production in Thailand. The effects of radial growth rate on solid wood properties were also discussed. The mean values of green moisture content (MC) and basic density (BD) at 1.2 m heights in each family ranged from 86...
Article
The effect of radial growth rate on anatomical characteristics and wood properties were examined in 4-year-old Neolamarckia cadamba. A total of 63 standing trees were categorised into three groups (slow, middle and fast growth) according to their stem diameter. Mean values of stem diameter, tree height and stress-wave velocity were 15.0 cm, 13.4 m...
Article
The aim of this study was to evaluate the effects of radial growth on wood properties and anatomical characteristics, and to clarify the xylem maturation process in Gmelina arborea. Stem diameter, tree height, and stress-wave velocity were investigated for 54 trees of 5-year-old G. arborea planted in Indonesia. In addition, radial variations of woo...
Article
The xylem-maturation process and the effects of radial growth rate on anatomical characteristics (vessel and fibre morphologies) and wood properties (basic density and compressive strength parallel to grain) were studied for 4-year-old Azadirachta excelsa planted in Indonesia. Mean values were 121 µm, 8.1 vessels/mm2, 16 µm, 1.4 µm, 0.33 mm, 0.98 m...
Article
Full-text available
The utilization of wood resources from unutilized fast-growing tree species found in secondary forests was investigated by studying the wood properties, including anatomical characteristics, of two Macaranga species—M. bancana and M. pearsonii—growing naturally in secondary forests in Central Kalimantan, Indonesia. Several wood properties related t...
Article
The objective of this study is to clarify the anatomical characteristics and lignin distribution of reaction wood in a vessel-less angiosperm species, Tetracentron sinense Oliv. Sample disks (1 cm in thickness) were collected from three different positions of a Tetracentron sinense tree. Cell morphologies, the microfibril angle (MFA) in the S2 laye...
Article
Zelkova serrata (Thunb.) Makino (“keyaki” in Japanese) is an important broad-leaved species for the wood industry in Japan. To analyze the among-family variation of anatomical characteristics in Z. serrata, wood fiber length (WFL), vessel element length in earlywood (VEL), fiber wall thickness (FWT), and vessel diameter in earlywood (VD) were inves...
Article
The anatomical, chemical, and physical characteristics of tension wood were investigated in the commercially important tropical fast-growing plantation species Falcataria moluccana and Acacia auriculiformis. In both cases, pots containing seedlings of the two species were tilted at 50° from a vertical position to promote tension wood formation. Dur...
Article
The growth characteristics, anatomical characteristics, and wood properties of Dysoxylum mollissimum, a fast-growing tree species, were investigated. To clarify the effect of radial growth rate on these characteristics and properties, 10-year-old trees planted in Bengkulu, Indonesia were examined and classified into three categories (fast-, medium-...
Article
With emphasis on tree breeding for wood quality in Picea jezoensis, we aimed to evaluate radial and between-family variations in the microfibril angle (MFA) of the S2 layer in the latewood tracheids in 10 open-pollinated families of 43-year-old P. jezoensis trees. In addition, the relationships between MFA/wood density with the modulus of elasticit...
Article
Full-text available
This study aimed to identify fast-growing tree species suitable for pulpwood obtained from a secondary forest in South Kalimantan, Indonesia. Chemical and pulp properties were determined for terap (Artocarpus elasticus Reinw. ex Blume), medang (Neolitsea latifolia (Blume) S. Moore), and balik angin (Alphitonia excelsa (Fenzel) Reissek ex Benth). Th...
Article
The anatomical characteristics of terap (Artocarpus elasticus), medang (Neolitsea latifolia) and balik angin (Alphitonia excelsa) were studied to identify new pulpwood resources among lesser-known species native to Indonesia. The mean values of fibre and vessel element lengths were 1.55 and 0.42 mm in terap, 1.21 and 0.56 mm in medang and 1.14 and...
Article
Characteristics of bark-stripping of Hinoki cypress (Chamaecyparis obtusa) trees by Japanese black bear (Ursus thibetanus japonicus) were investigated in Utsunomiya University Forest, and development of wood decay of the bark-stripped area was discussed. Mean DBH of bark-stripped trees in Hinoki cypress was 25.3 cm and larger than sound trees. Aver...
Article
Zelkova serrata is an important hardwood species for the timber industry in Japan. Tree breeding programs for this species have mainly focused on growth characteristics such as stem diameter (D), tree height (TH), stem form, and branching. In order to fulfill timber industry needs, wood quality improvement should be included in the tree breeding pr...
Article
Picea glehnii is one of the most important plantation species in Hokkaido, Japan. Basic density (BD) and microfibril angle (MFA) of the S2 layer in latewood tracheid in 16 full-sib families and their six parental clones planted in Hokkaido were examined to clarify among-family and clonal variations of wood properties and their inheritance from pare...
Article
Growth characteristics and wood properties were investigated for 26-year-old Eucalyptus alba trees grown in Ambon, Indonesia. The mean stem diameter and tree height were 27.9 cm and 19.5 m, respectively. In addition, the mean stress-wave velocity (SWV) of trees and basic density (BD) of outer wood (2 cm from the bark) were 3.23 km s-10.67 g cm-3, r...