Pruning is commonly used to mitigate the risk of tree failure by selectively removing tree parts exposed to the wind, but there have been few studies examining changes in wind loads after pruning, especially for large, open-grown trees. In this study, the wind-induced vibration and bending moments of Senegal mahogany (Khaya senegalensis) were monitored before and after a series of pruning treatments: crowns were either raised or reduced at incremental severities between 0 and 20 %. Under ambient wind loads, axial trunk deformation was measured using two displacement probes installed orthogonally on each tree, and each displacement probe was calibrated using a static load test to convert the measured trunk deformation to a bending moment. During each pruning treatment, ambient wind conditions and trunk deformation were monitored simultaneously for extended periods of time. As pruning severity increased, Fourier spectra showed that raised trees continued to vibrate primarily at their fundamental mode, but reduced trees vibrated progressively less than raised trees. Similarly, the average 30-minute maximum bending moment, associated with a given 30-minute maximum wind speed, decreased more for reduced than raised trees. Consistent with existing studies of small trees, the results suggest that arborists should reduce trees to decrease wind loads and, concomitantly, the likelihood of tree failure. Still, excessive leaf loss may constrain the usefulness of increasingly severe pruning on reduced trees: average leaf area index decreased by half on trees reduced by 20 %. More work is needed to understand the long-term physiological and mechanical consequences of pruning treatments.

修剪通常用于通过有选择地去除暴露在风中的树木部分来减轻树木衰落的风险，但是很少有研究检查修剪后的风荷载变化，特别是对于大的开阔树木。在这项研究中，塞内加尔桃花心木（Khaya senegalensis）的风致振动和弯矩）在一系列修剪处理之前和之后进行监控：以0至20％的严重度升高或降低冠度。在环境风荷载下，使用正交安装在每棵树上的两个位移探头测量轴向树干变形，并使用静载荷测试对每个位移探头进行校准，以将测得的树干变形转换为弯矩。在每次修剪过程中，将同时监视周围的风况和树干变形，以延长时间。随着修剪严重程度的提高，傅里叶光谱显示，高架树木主要以其基本模式继续振动，但减缩树木的振动逐渐小于高架树木。同样，平均30分钟的最大弯矩与给定的30分钟的最大风速相关，减少的比减少的树木要多。与现有的对小树的研究一致，结果表明，树木学家应减少树木以减少风荷载，并因此减少树木倒塌的可能性。尽管如此，过多的叶子损失可能会限制对减少的树木进行日益严重的修剪的用途：减少20％的树木的平均叶子面积指数减少一半。需要更多的工作来了解修剪疗法的长期生理和机械后果。树木的平均叶面积指数减少了一半，减少了20％。需要更多的工作来了解修剪疗法的长期生理和机械后果。树木的平均叶面积指数减少了一半，减少了20％。需要更多的工作来了解修剪疗法的长期生理和机械后果。