Skip to main content

Official Journal of the Japan Wood Research Society

Journal of Wood Science Cover Image

Effects of thinning and pruning on knots and lumber recovery of Taiwania (Taiwania cryptomerioides) planted in the Lu-Kuei area

Abstract

This study investigated the effects of various thinning and pruning methods on the knots (number and size) and lumber recovery from Taiwania (Taiwania cryptomerioides Hay.) plantation trees. The results showed that heavy thinning caused more knots and larger-diameter knots than medium or no thinning; moreover, pruning caused fewer numbers of knots and smaller-diameter knots than no pruning. Better-quality Taiwania trees occurred with the no-thinning/no-pruning treatments, as shown by analyzing the knots, although the results also showed that the healing process seemed to have produced not completely clear wood during the 9 years after the pruning treatment. The thinning intensity slightly enhanced the lumber recovery of logs. Pruning did not affect lumber recovery from taiwania trees and logs. Thinning increased the lumber recovery per tree due to an increase in the diameter at breast height.

Author information

Affiliations

Authors

Corresponding author

Correspondence to Cheng-Jung Lin.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Wang, S., Lin, C. & Chiu, C. Effects of thinning and pruning on knots and lumber recovery of Taiwania (Taiwania cryptomerioides) planted in the Lu-Kuei area. J Wood Sci 49, 444–449 (2003). https://doi.org/10.1007/s10086-002-0495-5

Download citation

Key words

  • Taiwania (Taiwania cryptomerioides Hay.)
  • Thinning
  • Pruning
  • Knots
  • Lumber recovery