Monitoring Tree Sway as an Indicator of Interception Dynamics Before, During, and Following a Storm
Monitoring Tree Sway as an Indicator of Interception Dynamics Before, During, and Following a Storm
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DOI：
10.1029/2021gl094980
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发表时间：
2021-10-28
影响因子：
5.2
通讯作者：
Loheide, Steven P., II
中科院分区：
文献类型：
--
作者：
Ciruzzi, Dominick M.;Loheide, Steven P., II
要了解树木在减弱到达地表的有效降水的时间和幅度方面的作用，就需要改进对拦截动态的监测。我们开发了一种新的现场监测方法，利用对树木摇摆运动的连续监测来量化风暴期间冠层蓄水的连续、动态时间序列。利用这种方法，我们还观察到树冠中的滞后拦截响应，这表明通过树木摇摆信号来解释拦截过程需要考虑风暴期间和之后水分(即质量)分布的变化。这些发现表明，持续监测树木摇摆运动提供了一种量化拦截过程的新技术。全树截留的这一进展可能有助于我们更好地理解截留如何影响生态系统水分可获得性/生产力和径流动态，这对自然生态系统和城市雨水管理都是重要的。在我们的工作中，我们试图通过跟踪树木摇摆运动的变化来了解风暴期间树木在树冠中储存了多少水分。在一次暴风雨中，我们发现，当树木变得非常潮湿时，树木来回摆动的运动变得缓慢。我们还发现，随着树木的枯竭，树木的摇摆运动变得更快。我们还了解到，树的摇摆运动也会随着雨水在树冠中的位置而变化。如果雨水离树冠顶部更近，树的摇摆速度会更慢；如果雨水离树冠底部更近，树的摇摆速度会更快。总体而言，这项研究表明，如果我们仔细观察和跟踪树木摇摆方式的变化，我们也可以理解和估计树木在暴风雨期间捕获了多少雨水，以及雨水在树冠内的位置。关键点监测树木摇摆期间提供了风暴期间和之后的拦截动态的聚合信号。树木摇摆监测提供了一种新的、廉价的方法来量化整个树冠的截留随时间的变化树从上到下累积雨水和干燥，这会导致在潮湿和干燥周期中树木摇摆的滞后变化
Understanding the role of trees in attenuating the timing and magnitude of effective precipitation reaching the land surface requires improved monitoring of interception dynamics. We developed a new field monitoring approach to leverage continuous monitoring of tree sway motion in quantifying continuous, dynamic time series of canopy water storage during storms. Using this approach, we additionally observed a hysteretic interception response in tree canopies, which indicates that interpreting interception processes through tree sway signals requires the consideration of changing water (i.e., mass) distribution during and following storms. These findings suggest that continuously monitoring tree sway motions offers a new technique to quantify interception processes. This advancement in whole tree interception may help improve our understanding of how interception affects ecosystem water availability/productivity and runoff dynamics that are important for both natural ecosystems and stormwater management in cities.Plain Language Summary In our work, we are trying to learn about how much water a tree stores in its canopy during storms by tracking changes in tree sway movements. During a storm, we found that the motion of a tree swaying back and forth becomes slower when a tree gets very wet. We also found that a tree's swaying motions became faster as a tree dried out. We also learned that a tree's swaying motions also change depending on where that rainwater is in the canopy. A tree will sway slower if rainwater is closer to the top of the canopy and a tree will sway faster if rainwater is closer to the bottom of the canopy. Overall, this research suggests that if we carefully watch and track changes in the ways a tree sways we can also understand and estimate how much rainwater a tree has captured, and where that rainwater is within the canopy, during a storm.Key PointsMonitoring tree sway period provides an aggregated signal of interception dynamics during and following a stormTree sway monitoring offers a novel, inexpensive approach for quantifying whole canopy interception through timeTrees accumulate rainwater and dry from the top down, which causes hysteretic changes in tree sway during wetting and drying cycles