Distribution of the Collapse Prevention Force of a Root System in Various Forests

Abstract

A distribution survey and a pull-out test of root systems in a Japanese cypress (Chamaecyparis obtusa) plantation were carried out to clarify the distribution of the collapse prevention force of the root system of surrounding trees. Based on the survey results and the relative values of the pull-out test resistance for each tree species, an estimation formula was created for the distribution of the collapse prevention force of a root system that consists of only three factors: tree species; coordinates; and diameter at breast height. This formula was consistent with values measured for various forests.