Microfibril Angles in the S2 layer of tracheids in Root and Stem Wood of Chamaecyparis obtusa: Prediction of microfibril angle of mature wood in the stem from root wood

Fukunaga, Daisuke; Matsumura, Junji; Oda, Kazuhiro

doi:10.2488/jwrs.51.141

Cited by 6 publications

(5 citation statements)

References 3 publications

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“…4 and in air-dried as in previous researches [29][30][31][32][33]. This is consistent with the previous researches [29][30][31][32][33] that the MFA of todomatsu is smaller than those of sugi and hinoki in both juvenile and mature wood. Therefore, it can be considered that for the same E/ρ, todomatsu is closer to juvenile wood than sugi and hinoki.…”

Section: Differences Of Correlation Between This Study and Previous R...supporting

confidence: 90%

“…Typically, the E/ρ of todomatsu distributes more to the higher side than that of sugi or hinoki both in green wood as in Fig. 4 and in air-dried as in previous researches [29][30][31][32][33]. This is consistent with the previous researches [29][30][31][32][33] that the MFA of todomatsu is smaller than those of sugi and hinoki in both juvenile and mature wood.…”

Section: Differences Of Correlation Between This Study and Previous R...supporting

confidence: 90%

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Moisture content estimation of green softwood logs of three species based on measurements of flexural vibration

Fukui,

Yanase,

Fujii

2023

J Wood Sci

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The moisture contents of sugi (Cryptomeria japonica), todomatsu (Abies sachalinensis) and hinoki (Chamaecyparis obtusa) logs were estimated using a method of moisture content estimation proposed in our previous study. In the course of estimation, it was revealed that the regression line of the correlation between specific dynamic Young’s modulus (E/ρ) and tangent loss (tan δ) of green wood was different from that of moisture-conditioned wood and showed species dependency, both of which are not previously reported. Regression lines at the fiber saturation point (FSP) were constructed for each species by measuring E/ρ and tan δ from the flexural vibration of green small specimens and correcting the E/ρ values at their own moisture contents into E/ρ values at the FSP. The correlation of green wood in this study was different from that reported in previous studies of moisture-conditioned wood near the FSP. The correlations of sugi and hinoki were similar, whereas those of sugi and todomatsu were different despite no previous report of species dependency in air-dried wood. The moisture contents 86 logs (not those used to prepare small specimens) were estimated using regression lines of each species. The standard deviation of the difference between the estimated moisture content and the measured moisture content was 15.7%. A systematic error of 25.9% in moisture content was attributed to the different methods of specimen support used for small specimens and logs.

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Section: Differences Of Correlation Between This Study and Previous R...supporting

confidence: 90%

Section: Differences Of Correlation Between This Study and Previous R...supporting

confidence: 90%

Moisture content estimation of green softwood logs of three species based on measurements of flexural vibration

Fukui,

Yanase,

Fujii

2023

J Wood Sci

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“…Endl. MFA becomes stable at about ring 20 at breast height, but at ring 10 at 8 m height, with little variation in the stable value (Fukunaga et al 2005).…”

Section: Within-tree Variabilitymentioning

confidence: 95%

“…In conifers, MFA varies from pith to bark, with the highest angles occurring in the first five growth rings from the pith at the base of the tree (Phillips 1941;Preston 1948Preston , 1949Wardrop & Dadswell 1950;Pillow et al 1953;Echols 1955;Hiller 1964a;Manwiller 1972;McMillin 1973;Erickson & Arima 1974;Bendtsen & Senft 1986;Pedini 1992;Donaldson 1992;Cave & Walker 1994;Sarén et al 2004;Xu et al 2004;Fukunaga et al 2005;Jordan et al 2005;Zhang et al 2007). Microfibril angles are high at the base of the stem and decrease exponentially with height in the lower stem, remaining constant beyond about 7 m, but increasing again near the top of the stem (Pillow et al 1953;Manwiller 1972;Donaldson 1992;Hirakawa & Fujisawa 1996;Downes et al 2003;Jordan et al 2005Jordan et al , 2006Zhang et al 2007).…”

Section: Within-tree Variabilitymentioning

confidence: 99%

“…Arnold and P. radiata pines, Matsumura and Butterfield (2001) found that high MFA values were confined to the first 2-3 rings from the root centre compared to 10-15 rings in stem wood. In Chamaecyparis obtusa, Fukunaga et al (2005) investigated the possibility of predicting mature stem wood MFA from measurements on root wood. Little variation was found along the length of the root, or with root diameter, and it was possible to predict mature wood MFA from root wood MFA.…”

Section: Within-tree Variabilitymentioning

confidence: 99%

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Microfibril Angle: Measurement, Variation and Relationships – A Review

Donaldson¹

2008

IAWA J

290

222

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Microfibril angle (MFA) is perhaps the easiest ultrastructural variable to measure for wood cell walls, and certainly the only such variable that has been measured on a large scale. Because cellulose is crystalline, the MFA of the S2 layer can be measured by X-ray diffraction. Automated X-ray scanning devices such as SilviScan have produced large datasets for a range of timber species using increment core samples. In conifers, microfibril angles are large in the juvenile wood and small in the mature wood. MFA is larger at the base of the tree for a given ring number from the pith, and decreases with height, increasing slightly at the top tree. In hardwoods, similar patterns occur, but with much less variation and much smaller microfibril angles in juvenile wood. MFA has significant heritability, but is also influenced by environmental factors as shown by its increased values in compression wood, decreased values in tension wood and, often, increased values following nutrient or water supplementation. Adjacent individual tracheids can show moderate differences in MFA that may be related to tracheid length, but not to lumen diameter or cell wall thickness. While there has been strong interest in the MFA of the S2 layer, which dominates the axial stiffness properties of tracheids and fibres, there has been little attention given to the microfibril angles of S1 and S3 layers, which may influence collapse resistance and other lateral properties. Such investigations have been limited by the much greater difficulty of measuring angles for these wall layers. MFA, in combination with basic density, shows a strong relationship to longitudinal modulus of elasticity, and to longitudinal shrinkage, which are the main reasons for interest in this cell wall property in conifers. In hardwoods, MFA is of more interest in relation to growth stress and shrinkage behaviour.

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Relationships among selected wood properties of 20-year-old Taiwania (Taiwania cryptomerioides) trees

Lin

Chiu

2007

J Wood Sci

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Microfibril Angles in the S2 layer of tracheids in Root and Stem Wood of Chamaecyparis obtusa: Prediction of microfibril angle of mature wood in the stem from root wood

Cited by 6 publications

References 3 publications

Moisture content estimation of green softwood logs of three species based on measurements of flexural vibration

Moisture content estimation of green softwood logs of three species based on measurements of flexural vibration

Microfibril Angle: Measurement, Variation and Relationships – A Review

Relationships among selected wood properties of 20-year-old Taiwania (Taiwania cryptomerioides) trees

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