ABSTRACT Plants that experience a lack of sufficient irrigation undergo hydric stress, which causes the modification of their mechanical properties. These changes include a complex network of chemical and physical signals that interact between plant-plant and plant-environment systems in a mechanism that is still not well understood, and that differs among species. This mechanical response implies different levels of vibration when the plant experiences structural modifications from self-hydraulic adjustments of flux exchange at specific frequencies, with these carrying behavioral information. To measure these signals, highly sensitive instrumentation that allows the decoding of displacement velocity and displacement of plants, which is possible through calibrated equipment such as 3D scanning laser vibrometers, is necessary. Laser vibrometry technology allows for noninvasive measurements in real-time. Physiological changes could reasonably affect the biomechanical condition of plants in terms of the frequency (hertz) and intensity of the plant’s vibration. In this research, it is proposed that the frequency changes of a plant’s vibration are related to the plant’s hydric condition and that these frequency vibrations have the ecological potential to communicate water changes and levels of hydric stress. The peak of the velocity of plant displacements was found to vary from 0.079 to 1.74 mm/s, and natural frequencies (hertz) range is between 1.8 and 2.6 Hz for plants with low hydric stress (LHS), between 1.3 and 1.6 Hz for plants with medium hydric stress (MHS), and between 6.7 and 7.8 Hz for plants with high hydric stress. These values could act as preliminary references for water management using noninvasive techniques and, knowledge of the range of natural frequencies of hydric stress risk in chili pepper crops can be applied in precision agriculture practices.

中文翻译：

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水分胁迫对辣椒植物振动频率模式的影响

摘要 缺乏足够灌溉的植物会经历水胁迫，这会导致其机械性能发生改变。这些变化包括复杂的化学和物理信号网络，它们在植物-植物和植物-环境系统之间相互作用，其机制尚不清楚，并且在物种之间有所不同。这种机械响应意味着当工厂经历特定频率下通量交换的自液压调整引起的结构修改时，振动水平不同，这些变化携带行为信息。为了测量这些信号，需要使用高度灵敏的仪器来解码植物的位移速度和位移，这可以通过 3D 扫描激光测振仪等校准设备实现。激光测振技术允许进行实时无创测量。生理变化可以在植物振动的频率（赫兹）和强度方面合理地影响植物的生物力学条件。在这项研究中，提出植物振动的频率变化与植物的水分条件有关，并且这些频率振动具有传达水分变化和水分胁迫水平的生态潜力。发现植物位移速度的峰值在 0.079 到 1.74 毫米/秒之间变化，自然频率（赫兹）范围对于具有低水应力 (LHS) 的植物在 1.8 到 2.6 Hz 之间，对于植物在 1.3 到 1.6 Hz 之间中等水力胁迫 (MHS)，高水力胁迫的植物在 6.7 和 7.8 Hz 之间。