Energy transfer during tree movement for different wind conditions and forest configurations

作者：K. Kamimura, Kazuki Nanko, Asako Matsumoto, Saneyoshi Ueno, Barry Gardiner · 发表于：Forest Ecology and Management · 年份：2024 · DOI：10.1016/j.foreco.2024.122223 · 被引用次数：7 · 研究领域：Tree Root and Stability Studies、Plant Water Relations and Carbon Dynamics、Aeolian processes and effects

Catastrophic winds from tropical cyclones and storms cause tree failure in forests, leading to economic and environmental losses. Tree failure, especially uprooting, results from energy transfer from winds to the roots through the tree stem. However, we do not fully understand how trees in forests respond to winds under different weather conditions and whether the responses remain unchanged with the configurations of the forest. In this study, we established two Cryptomeria japonica plots, namely P-100 as a control (3000 stem ha −1 ), and P-50, which was thinned to halve the control stand density (1500 stem ha −1 ) in November 2017, in Kasumigaura City, Japan. Two kinds of sensors were installed on the tree stems in the plots and data was collected over the following 2 years. Strain gauge transducers at the stem base were used to calculate turning moments. Inertial measurement unit (IMU) sensors at 6 m height provided the x, y, and z coordinates of the tree motion. At the end of the observation period, we conducted tree-pulling experiments to calculate the maximum turning moments the trees could resist. During the observation period, the trees experienced winds from typhoons, including super typhoon Trami in 2018, causing some tree failure in the thinned plot (P-50). Based on this damage incident, we selected four different forest configurations and 18 windy conditions (7 typhoons and 11 weather conditions in which a maximum wind speed of more than 7 m s −1 was observed). We ...