Futoshi Ishiguri

• Ph D
• Professor (Associate) at Utsunomiya University

Database for radial variations of anatomical characteristics and wood properties in tropical trees (DaRV-tropics)’ is constructed using data collected by the Laboratory of Forest Products and Wood Material Science, School of Agriculture, Utsunomiya University, Japan, to promote effective utilization of forest resources. The concept to construct thi...

The growth traits (stem diameter at 1.3 m above the ground and tree height), stress-wave velocity of the stems, and log characteristics (taper and dynamic Young’s modulus of logs) were examined for 54 trees from 18 half-sib families planted in a seedling seed orchard of the first-generation Neolamarckia macrophylla (11-year-old) in Wonogiri, Centra...

Fraxinus griffithii C. B. Clarke is introduced from Taiwan to Thailand by the Royal Project Foundation beginning of the 1980s for highland rehabilitation. To improve the growth traits and tree form characteristics, a tree breeding program for this species has been initiated. In the present study, we evaluated the among seed sources variations in gr...

To evaluate the inheritance of natural durability of Acacia mangium Willd., wood-color parameters ( Y [lightness], x [red to green], and y [yellow to blue]), mass loss by a white-rot fungus ( Trametes versicolor ) and brown-rot fungus ( Fomitopsis palustris ), and three different extracts (methanol extract, total phenol, and total flavanol content)...

The information on the relationship between age-related changes in stem size and wood properties is essential for promoting plantation forestry and wood utilization using fast-growing tree species. In this study, age-related changes in radial growth increments of stems and wood properties were preliminarily examined using mixed-effects modeling in...

Logs of Betula ermaniiCham. were heated at a temperature inside the logs of 80°C for different heating durations of 0, 20, 40, and 60 h using a laboratory oven. After heating treatment, several wood qualities were examined, including residual stresses, moisture content, wood color, and physical and mechanical properties. The effects of the heating...

Using pyrolysis–gas chromatography–mass spectrometry, the lignin composition was analysed in normal and reaction wood samples grown at three stem inclination angles in Gardenia jasminoides , which forms compression wood-like reaction wood. Lignin content among the samples was not significantly different. However, the reaction wood samples with larg...

The aim of this study is to evaluate the possibility of re-establishment of the Paulownia tomentosa (Thunb.) Steud. forestry and wood industry for sustainable wood production in Japan. Bending properties were preliminarily investigated for dimension lumber (2 by 4, 38 by 89 mm in transverse section) and small-clear specimens of this species. The se...

The objectives of the present study are to clarify the effect of macro- and micro-environment on the radial growth patterns and radial variation patterns of basic density in hinoki cypress ( Chamaecyparis obtusa (Sieb. et Zucc.) Endl.). We evaluated the radial variation patterns of cumulative annual ring width (as radial growth pattern) and basic d...

The knowledge of xylem maturation manner is importance to foresters and wood processors as it has major implications for end-product quality. This study aims to evaluate the maturation manner of secondary xylem in Eucalyptus camaldulensis for solid wood production. The samples were 45 twelve-year-old trees from 15 families with different radial gro...

The breeding of a fast-growing tree species, Acacia mangium Willd. has entered the third-generation cycle in Indonesia. To fulfill timber industry needs, wood traits, as well as growth traits, should be improved by conducting appropriate tree breeding programs for this species. In the present study, growth and wood traits were measured for the 10-y...

Decay process of wood of Japanese white birch [ Betula platyphylla Sukaczev var. japonica (Miq.) H. Hara] tree by Inonotus obliquus (Fr.) Pilát was clarified by using the regression model in wood color and chemical components as a function of height position (1, 2, 3, and 4 m above the ground), wood type (sound wood and decayed wood), and their int...

Inonotus obliquus is a pathogenic fungus found in living trees and has been widely used as a traditional medicine for cancer therapy. Although lignocellulose-degrading enzymes are involved in the early stages of host infection, the parasitic life cycle of this fungus has not been fully understood. In this study, we aimed to investigate the activiti...

Tracheid length is lowest at the pith and then it increases rapidly as cambial age increases up until it reaches an asymptote value in what is known as ‘Sanio’s first law’. However, it is still unclear the effect of radial growth rate on latewood tracheid length and the effect of radial variation pattern of latewood tracheid length on the boundary...

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 sylvest...

The effects of laminate configuration on mechanical properties were investigated for model glued-laminated timber (GLT) composed of single and mixed fast-growing tree species (Acacia mangium Willd., Maesopsis eminii Engl., and Melia azedarach L.), which were grown in community forests in Indonesia. The simulation of lamina yield was decreased in gr...

The anatomical characteristics (fiber length and fiber area) and mechanical properties (modulus of elasticity, modulus of rupture, compressive strength, tensile Young’s modulus, and tensile strength) of Bambusa vulgaris, Bambusa maculata, and Gigantochloa atter, naturally growing at four different sites in Lombok Island, Indonesia, were examined fo...

The sapwood of Japanese cedar (Cryptomeria japonica D. Don) was decayed by the brown-rot fungus Fomitopsis palustris under bright and dark conditions. Scanning electron microscopy revealed the presence of mycelia inside the wood even after 1 week from the start of fungal exposure. Moreover, holes were observed in the torus after fungal exposure. Ru...

Key message Larger differences of maximum load among families were found in mature wood compared to juvenile wood, suggesting the possibility of improving mature wood with higher resistance to rupture and maintaining characteristics of material in Larix kaempferi (Lamb.) Carr. by selecting specific mating parents. Context Because the wood from L....

Promoting wood utilization from fast-growing tree species is one solution to address supply and demand issues relating to wood resources while sequestering carbon dioxide in large quantities. Information on the quality of wood from fast-growing tree species and its relationship with changes in stem size is essential for promoting the establishment...

Wood properties (annual ring width, tracheid length, microfibril angle [MFA], basic density, and air-dry density) and mechanical properties (modulus of elasticity [MOE], modulus of rupture [MOR], bending work, and compressive strength) in 34-year-old Chamaecyparis obtusa trees of six half-sib families were measured from pith to bark to clarify radi...

Betula platyphylla Sukaczev, a fast-growing pioneer tree, is an important species for wood resources in boreal regions and steppe areas in Mongolia. We examined the anatomy and maturation of wood in 30 B. platyphylla trees growing in natural populations in three different sites in Mandal, Selenge, Mongolia to clarify the relationship between tree g...

To clarify sawn-timber quality and those among-family variations of hinoki cypress (Chamaecyparis obtusa), modulus of elasticity (MOE) and modulus of rupture (MOR) were evaluated for 97 pieces of 38 by 89 mm sawn timber produced from half-sib families planted in a progeny test stand at Chiba, Japan. Correlations were evaluated on mechanical propert...

To effectively and sustainably utilize wood resources from boreal forests in Mongolia, anatomical characteristics, tracheid morphology, cell proportion, annual ring width, and latewood percentage were preliminary determined in Pinus sylvestris, Pinus sibirica, Picea obovata, and Larix sibirica trees naturally growing in Mongolia. Based on the obser...

This study estimates the costs and profits of extracting dead trees from forests to be sold at provincial centers via sub-provincial centers as lumber, to be sold at sub-provincial centers as firewood and unused materials for the production of energy. The effect of site conditions on cost and profit was examined. Forest registration data including...

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 %...

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...

In this study, we estimated the technoeconomic availability of three types of dead trees, namely commercially fallen, normally fallen, and standing, in Mongolian subgroups. For dead trees of three major Mongolian tree species (Siberian larch, Scotch pine, and Asian white birch), lumber, firewood, and unused material as sources of energy were quanti...

Boundary between core and outer wood should be clarified for tropical fast-growing tree species to utilize its wood resources under sustainable forestry. This study aimed to determine the boundary between core and outer wood based on the mixed-effects models for radial variations of anatomical characteristics and wood properties in three fast-growi...

Longitudinal and geographic variations in the green moisture content and basic density of bamboo culm were evaluated by using linear mixed-effect models for three bamboo species (Bambusa vulgaris Schrad. ex J.C., Bambusa maculata Widjaja, and Gigantochloa atter (Hassk) Kurz ex Munro) naturally grown in four locations in Lombok Island, Indonesia. Th...

"In the present study, the decay resistance and the changes in the amounts of chemical components of wood as a consequence of decay by Fomitopsis palustris and Trametes versicolor were investigated for two tropical fast-growing tree species – Neolamarckia cadamba and Ochroma pyramidale. Decay tests were conducted according to Japanese Industrial St...

The aim of this study is to obtain the basic wood properties of three lesser known species tengkook ayam (Nephelium sp), madang pirawas (Neolitsea firma) and merambung (Vernonia arborea)). Stem diameter at 1.3 m above the ground and tree height were measured on 3 trees from each species. Later, core samples were collected from all the measured tree...

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...

Log characteristics and basic density were evaluated in four common Mongolian softwoods, Pinus sylvestris L., Pinus sibirica Du Tour, Picea obovata Ledeb., and Larix sibirica Ledeb. by developing the linear or nonlinear mixed-effects models for longitudinal and radial variations of measured characteristics. Total of 19 trees from four species were...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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,...

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...

The management of abandoned coppiced forests is an important issue for sustainable forestry. Lithocarpus edulis (Fagaceae) is a rarely-used hardwood species in Japan, although it is an abundant and fit species for resource utilization. This study aimed to clarify the variation of the stress-wave velocity (SWV) of stems among and within stands of L....

Along with progress in sequencing technology and accumulating knowledge of genome and gene sequences, molecular breeding techniques have been developed for predicting the genetic potential of individual genotypes and for selecting superior individuals. For Japanese cedar (Cryptomeria japonica (L.f.) D.Don), which is the most common coniferous speci...

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...

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...

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....

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...

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...

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...

The aim of this study is to obtain the basic wood properties of planted Borneo ironwood (Eusideroxylon zwageri) from a plantation established about 80 years ago. Stem diameter at 1.3m above the ground, tree height, and stress-wave velocity (SWV) of stem were measured on 36 planted E. zwageri trees. Later, core samples were collected from four trees...

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...

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...

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...

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...

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...

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...

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...

In order to promote plantation establishment of Larix gmelinii var. olgensis (syn. L. olgensis A. Henry), a ‘near threatened’ species, the wood and lumber properties were preliminary investigated for five trees from two clones of 57-year-old trees planted in Japan. The mean value of dynamic Young’s modulus of logs was 10.16 GPa. The mean values of...

The wood and lumber properties were examined for 67-yr-old Japanese larch (Larix kaempferi) trees with different radial growth rates planted in Tochigi Prefecture, Japan. The trees were categorized into slow-, medium-, and fast-growing groups based on the stem diameter. No significant difference in stresswave velocity of stems, which is closely rel...

Variance components of tree height (HT) and stem diameter at 1.3 m above the ground (DBH) were investigated for the eight open-pollinated families of Zelkova serrata (Thumb.) Makino planted with three different initial planting spacings in a progeny test site, Chiba, Japan. Parent–offspring correlations were also evaluated by using these families a...

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...

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...

An environmentally compatible wood preservation was attempted by using whey protein isolate （WPI）, which is a water-soluble protein and derived from milk whey. Sugi （Japanese cedar, Cryptomeria japonica D. Don） sapwood specimens were impregnated with WPI and heated to denature and insolubilize proteins. The fungal decay test using a brown-rot fungu...

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...

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...

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...

We analyzed forms and wood decay conditions of bark-stripped trees by Japanese black bear (Ursus thibetanus japonicus Schlegel) in Sugi plantations (Cryptomeria japonica (Thunb. ex L.f.) D. Don) of Utsunomiya University Forest and discussed development of wood decay in bark-stripped stem. Distribution in percentage of bark-stripped area was occupie...

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...

The aim of this study was to clarify the wood properties of two interspecific Eucalyptus hybrids, Eucalyptus grandis × Eucalyptus pellita (G × P) and E. grandis × Eucalyptus urophylla (G × U), developed in Indonesia. The growth characteristics and stress-wave velocity (SWV) were evaluated for 102 trees from three clones of the G × P hybrid and 105...

Wood industry based on sengon (Falcataria moluccana) material has developed rapidly and cause the huge wastes. Lignocellulosic materials, such as sengon sawdust, offer a great potential as cheap and abundant feedstock for biofuels production. Ozone oxidation pretreatment was carried out on sengon wastes to improve fermentable sugar production by en...

Porodaedalea pini is a white-rot fungus that attacks conifers and secretes different kinds of extracellular enzymes. To our best of knowledge, this is the first report identifying the secreted proteome of P. pini grown on liquid medium. Some proteins involved in carbohydrate metabolism were identified by peptide mass fingerprinting (PMF) using matr...

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...

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...

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,...

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...

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...

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...

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...

In order to conduct further verification of measuring broad-leaved forests using a low-cost portable Terrestrial Laser Scanner (TLS), the present study measured a secondary broad-leaved forest of the Funyu experimental forest, Utsunomiya University, Japan. Then, DBH, height, top end diameter, sweep, and stem volume were analyzed and compared with r...

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...

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...