Abstract
We examined the way of estimating the thinning effect using the mesh method in conventional non-line thinning and line thinning to utilize the high-performance yarding machine. The effect of line thinning was a little less than non-line thinning. However, it found that the effect like a non-line thinning was gotten by cutting additional few neighbor trees around the thinning lines. The work efficiency is high, and line thinning has the merit that it is possible to use the line trace, when the next thinning and tending would be done.
