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Evaluation of standing tree quality of Japanese cedar grown with different spacing using stress-wave and ultrasonic-wave methods

Journal of Wood Science volume 47, pages 245–253 (2001)Cite this article

Abstract

The quality of wood in 47-year-old standing trees of Japanese cedar grown in five plantation sites with different spacing (A, 1×1m; B, 2×2m; C, 3×3m; D, 4×4m; E, 5×5m) was evaluated using stress-wave and ultrasonicwave propagation methods. The magnitude of the velocities of these waves and the calculated dynamic modulus of elasticity (MOE) were used as indexes for assessing wood quality in standing trees. Results indicated that plantation spacings had moderate influence on the stress-wave and ultrasonic-wave velocities, and the degree of influence varied with the wave-propagating direction. Regardless of the testing method used, the velocities of waves propagated parallel to the grain in the standing trees with medium and poor growth conditions were significantly greater than those with superior growth conditions. The dynamic MOE of the trunk of standing trees of Japanese cedar was calculated by adjusting the effective mobility of free water and effective density in the trunk at various moisture contents. Results indicated that the dynamic MOE of wood in the standing trees of Japanese cedar was affected somewhat by the testing methods used. Furthermore, the dynamic MOE of the wood in the standing trees varied with the growth conditions imposed.

References

  1. Aratake S, Arima T, Sakoda T, Nakamura Y (1992) Estimation of modulus of rupture (MOR) and modulus of elasticity (MOE) of lumber using higher natural frequency of log in pile of log-spossibility of application for sugi scaffolding board. Mokuzai Gakkaishi 38:995–1001

    Google Scholar 

  2. Kodama Y (1990) A method of estimating the elastic modulus of wood with variable cross-section forms by sound velocity. I. Application for logs. Mokuzai Gakkaishi 36:997–1003

    Google Scholar 

  3. Nakamura N (1996) Measuring of the properties of standing trees with ultrasonic and mapping of the properties. Q J Exp For Univ Tokyo 96:125–135

    Google Scholar 

  4. Nakamura N, Nanami N (1993) The sound velocities and moduli of elasticity in the moisture desorption process of sugi wood. Mokuzai Gakkaishi 39:1341–1348

    Google Scholar 

  5. Nanami N, Nakamura N, Arima T, Okuma M (1992) Measuring the properties of standing trees with stress waves. I. The method of measurement and the propagation path of the waves. Mokuzai Gakkaishi 38:739–746

    Google Scholar 

  6. Nanami N, Nakamura N, Arima T, Okuma M (1992) Measuring the properties of standing trees with stress waves. II. Application of the method to standing trees. Mokuzai Gakkaishi 38:747–752

    Google Scholar 

  7. Nanami N, Nakamura N, Arima T, Okuma M (1993) Measuring the properties of standing trees with stress waves. III. Evaluating the properties of standing trees for some forest stands. Mokuzai Gakkaishi 39:903–909

    Google Scholar 

  8. Wang SY (1984) Studies on the dynamic and acoustic behaviors of wood. I. Studies on the influencing factors on the velocity of sound in wood. Q J Exp For NTU 150:1–23

    Google Scholar 

  9. Wang SY (1986) Studies on the dynamic and acoustic behaviors of wood. II. Studies on the dynamic modulus of elasticity and internal friction of wood. Mem Coll Agric Nat Taiwan Univ 25(1):51–76

    Google Scholar 

  10. Wang SY, Cho CL (1986) Studies on the dynamic and acoustic behaviors of wood. IV. The effect of coating on the dynamic modulus of elasticity and internal friction of wood. Mem Coll Agric Nat Taiwan Univ 26(1):l-26

    Google Scholar 

  11. Ross RJ, McDonald KA, Green DW, Schad KC (1997) Relationship between log and lumber modulus of elasticity. For Prod J 47(2):89–92

    Google Scholar 

  12. Sandoz JL, Lorin P (1994) Standing tree quality assessments using ultrasound. Presented at the First European Symposium on nondestructive evaluation of wood, Sept. 21–23, 1994, Sopron, Hungary, pp 493–502

    Google Scholar 

  13. Sobue N (1993) Simulation study on stress wave velocity in wood above fiber saturation point. Mokuzai Gakkaishi 39:271–276

    Google Scholar 

  14. Wang SY, Chen KN (1992) Effects of plantation spacing on tracheid lengths, annual-ring widths, and percentages of latewood and heartwood of Taiwan-grown Japanese cedar. Mokuzai Gakkaishi 38:645–656

    Google Scholar 

  15. Wang SY, Ko CY (1998) Dynamic modulus of elasticity and bending properties of large beams of Taiwan-grown Japanese cedar from different plantation spacing sites. J Wood Sci 44:62–68

    Article  Google Scholar 

  16. Wang SY, Lin FC (1994) Effects of plantation spacing on density and mechanical properties of Japanese cedar. Mem Coll Agric Nat Taiwan Univ 34:124–152

    Google Scholar 

  17. Wang SY, Lin SH (1996) Effects of plantation spacings on the quality of visually graded lumber and mechanical properties of Taiwan-grown Japanese cedar. Mokuzai Gakkaishi 42:435–444

    Google Scholar 

  18. Wang SY, Chuang ST (2000) Experimental data correlation of the dynamic elastic moduli, velocity and density of solid wood as a function of moisture content above the fiber saturation point. Holzforschung 54:309–314

    CAS  Article  Google Scholar 

  19. Hwang CE (1990) Multivariable analysis. Chinese Economic Enterprise Institute, Taipei, Taiwan, ROC

    Google Scholar 

  20. Sumiya K, Shimaji K, Itoh T, Kuroda H (1982) A consideration on some physical properties of Japanese cedar (Cryptomeria japonica D. Don) and Japanese cypress (Chamaecyparis obtusa S. and Z.) planted at different densities. Mokuzai Gakkaishi 28:255–259

    Google Scholar 

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Authors and Affiliations

  1. Department of Forestry, College of Agriculture, National Taiwan University, NO 1, Sect. 4, Roosevelt Road, Taipei, Taiwan, ROC

    Shih-Tzu Chuang & Song-Yung Wang

Authors
  1. Shih-Tzu Chuang
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  2. Song-Yung Wang
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Correspondence to Song-Yung Wang.

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Chuang, ST., Wang, SY. Evaluation of standing tree quality of Japanese cedar grown with different spacing using stress-wave and ultrasonic-wave methods. J Wood Sci 47, 245–253 (2001). https://doi.org/10.1007/BF00766709

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  • DOI: https://doi.org/10.1007/BF00766709

Key words

  • Japanese cedar standing tree
  • Plantation spacing
  • Stress-wave method
  • Ultrasonic-wave method
  • Growth conditions