Monitoring Tree Sway as an Indicator of Water Stress
Monitoring Tree Sway as an Indicator of Water Stress
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DOI：
10.1029/2019gl084122
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发表时间：
2019-11-11
影响因子：
5.2
通讯作者：
Loheide, Steven P.
中科院分区：
文献类型：
--
作者：
Ciruzzi, Dominick M.;Loheide, Steven P.
了解和预测日益频繁和严重的干旱的未来后果需要改进对森林反应的监测。在一天的过程中，采油树的质量和刚度会动态响应不断变化的大气和水力条件。通过进行24小时的实验，我们试图解开质量和刚度变化对树摇摆期的影响。结果表明，树的质量和刚度受树含水量变化的影响，树摇期的日变化主要受树刚度损失和恢复的驱动。在两棵红橡树的一个季节的时间序列中，我们观察到在土壤湿度最干燥的日子里，摇摆期的中午增加更明显，而且明显更高（+7%）。
Understanding and predicting future consequences of increasingly frequent and intense droughts requires improved monitoring of forest response. Over the course of a day, tree mass and stiffness respond dynamically to changing atmospheric and hydraulic conditions. By conducting a 24-hr experiment, we sought to disentangle the effects of changing mass and stiffness on tree sway period. We observed that tree mass and stiffness are influenced by changes in tree water content and that diurnal changes in tree sway period are chiefly driven by the loss and recovery of tree stiffness. Over a season-long time series in two Quercus rubra (red oak) trees, we observed more pronounced and substantially higher midday increases (+7%) in sway period during days with the driest soil moisture (