Abstract
The writer has proposed a certification method of intensity of resistance of tree against stone fall by reason of fundamental studies on the prevention forest of stone fall.
Namely, he calculated experimental value of impact-absorb-energy by the test piece of several species of tree.
Moreover, the relation between energy of falling stone, impact-absorb-energy of test piece and diameter of tree is expressed by an equation.
Namely, these results will give the fundamental data to the formation of forest, selection of tree kind of tree, determination of age tree years etc. of prevention forest of stone fall.
