Abstract
Tree-pulling experiments were conducted on sugi (Cryptomeria japonica and hinoki (Chamaecyparis obtusa) involving trees of various diameters, including large-diameter trees with >30 cm diameter at breast height (DBH), in central Mie prefecture. The critical turning moment of sugi and hinoki showed a high correlation with DBH. For belowground parameters, the critical turning moment of sugi showed a correlation with the depth of center point of rotation, and that of hinoki showed a correlation with depth of center point of rotation and root plate radius. Regression lines between critical turning moment and DBH of sugi differed from hinoki; the critical turning moment of hinoki was higher than that of same-sized sugi. The critical turning moment derived from regression lines between critical turning moment and DBH in this study were lower than that of previous studies.
