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Speaker : Pei-Yu Kuo

Plantation Density and Thinning Effect on the Length of Tracheid and Maturing Age of Japanese-cedar Grown in Taiwan. Speaker : Pei-Yu Kuo. I ntroduction. Large percentage of plantation. Even-aged. Low economic value. Plantation density Thinning intensity. Anatomy of the wood.

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Speaker : Pei-Yu Kuo

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  1. Plantation Density and Thinning Effect on the Length of Tracheid and Maturing Age of Japanese-cedar Grown in Taiwan Speaker : Pei-Yu Kuo

  2. Introduction Large percentage of plantation Even-aged Low economic value Plantation density Thinning intensity Anatomy of the wood Japanese-cedaris one of the important resources in Taiwan.

  3. Materialand Method – site location

  4. Materialand Method – data of the site

  5. Result and Discussion 1 The anatomy from pith to bark and their relationship

  6. Result and Discussion length of tracheid (mm) Ring number from pith (years) The growing curve of trachied is a log curve

  7. Result and Discussion Ring number from pith (years) The MFA decreased rapidly at first and then remained constant.

  8. Result and Discussion The degree of MFA and the length of tracheid have contrary trend.

  9. Result and Discussion 33rd to 36th Second thinning 23rd to 32nd First thinning 1st to 22nd Plantation density We not only discuss the average data, but also separate those data into three sections and discuss the effect of each treatment.

  10. Result and Discussion

  11. Result and Discussion 2 Three methods to distinguish the maturing age

  12. Result and Discussion length of tracheid (mm) Ring number from pith (years) Method 1 : the elongation ratio of log curve is less than 1%

  13. Result and Discussion length of tracheid (mm) Ring number from pith (years) Method 2 : Reducing the numbers of sample

  14. Result and Discussion Aaccumulated width of annual ring (mm) Ring number from pith (years) Method 3 : the elongation ratio of log curve is less than 3%

  15. Result and Discussion

  16. Conclusions The anatomy from pith to bark and their relationship The length of tracheid decreases with the increasing MFA. It shows negative linear regression (R2=0.71) when the length of tracheid is versus the angle of MFA. The effect of planation density and thinning The average lengths of high plantation density or one to twenty years grown tracheid have significant longer lengths than low plantation density tracheid. But, there is no significant difference in thinning treatment.

  17. Conclusions Three methods to distinguish the maturing age Using the three mentioned methods to determine the age of maturity, we can conclude that it is 19 years old. Morerover, there is no significant difference between the results of these methods above to judge the age. No matter in the length of tracheid or the angle of MFA, mature wood has significant longer tracheid length and smaller MFA than juvenile wood.

  18. Thank you for your attention Comments and Questions are Welcome

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