Effect of thinning on the ring characteristics of Japanese cedar plantation trees |
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| Authors: | Far-Ching Lin Chih-Hsin Chung Jia-Lin Zeng Te-Hsin Yang Song-Yung Wang Cheng-Jung Lin |
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| Affiliation: | (1) School of Forestry and Resource Conservation, College of Agriculture, National Taiwan University, 1 Roosevelt Rd., Sec. 4, Taipei, 106, Taiwan;(2) Department of Forest Management, Taiwan Forestry Research Institute, 53 Nanhai Rd., Taipei, 100, Taiwan;(3) The Experimental Forest, College of Bio-resources and Agriculture, National Taiwan University, Taipei, Taiwan;(4) Department of Forestry, College of Nature Resource and Agriculture, National Chung Hsing University, Taichung, 401, Taiwan;(5) Department of Forest Utilization, Taiwan Forestry Research Institute, 53 Nanhai Rd., Taipei, 100, Taiwan; |
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| Abstract: | The purpose of this study was to explore the ring characteristics of Japanese cedar (Cryptomeria japonica) tree growth with thinning and unthinning regimes. The trees grown with thinning regimes increased in average ring width (RW), earlywood width, latewood width, ring density (RD), earlywood density, latewood density, maximum ring density, and latewood percentage (LWP) for the entire period of 16 years after thinning, as compared to those grown with unthinning regimes. The RW and RD components showed different reactions lasting several years after thinning. Overall, thinning caused immediate production (first year) of higher RD, lasting for several years; however, wider RW was delayed up to several years after treatment. There was a weak relationship between RW (growth rate) and wood density; and there were significant positive relationships between the RD and LWP. The results suggest that the compression wood produced after thinning. |
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