Relationship between snapping stems and modules of rupture of damaged trees by the typhoon in an urban green space

Abstract

In order to clarify the characteristics of typhoon effects on the trees in urban green spaces, observations were carried out in a green area after No.21 typhoon in 2018. There were 3122 trees in the area before typhoon, 145 snapping stems, 58 uprooting stems and 23 leaning stems were observed after the typhoon. Damaged ratio of root and stem of exotic woody species and cultivar was significantly higher than that of indigenous species. In the logistic regression analysis, the obtained regression equation between proportion of snapping stems and modules of rupture was statistically significant. These data suggest the possibility that MOR is the important parameter for estimating the windthrow by a typhoon.