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Hydraulic flow model of plant organs in response to physical and environmental factors

机译：响应物理和环境因素的植物器官液压流模型

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A mechanistic hydraulic flow model based upon plant physiological behavior is proposed in this work to determine functionality of different plant organs in handling flows of water. The model is developed by introducing various standard elements in bond graph lexicon. Out of all the resistive elements of plants, stem xylem resistance and stomatal resistance are modeled by taking diurnal variation. The value of stem xylem resistance of the plant is the maximum value at midday (2.96x10(7) MPa s/m(3)) and the minimum value (2.4x10(7) MPa s/m(3)) in the dark period. A Jarvis-Stewart type model for stomatal conductance is implemented for developing stomatal resistance. The process of transpiration which is formulated with the help of Ohm's law analogy is also incorporated in the model. Thermal behavior of the vegetation is introduced by taking the boundary layer, aerodynamics, ambient temperature, relative humidity and global solar radiation into account. Simulations are performed for specific kinds of plants and for specific sights. Finally, various environmental and physical influencing factors are considered to study the response of the plant model, and this modeling technique offers a novel modeling tactic alternative to field measurements. The transpirational flow at constant water potential of -0.15 MPa varies between 1.2x10(-8) to 2.25x10(-8) m(3)/s during the day period. The rate of transpiration reaches a maximum value of about 2.0x10(-8) m(3)/s during the early hours in each day while the value of solar radiation is about 700 Wm(-2). Leaf water potential depletes to a minimum value of -1.5 MPa at the 5(th) day of the drying cycle period.
机译：在这项工作中提出了一种基于植物生理行为的机械液压流模型，以确定不同植物器官在处理水流中的功能。通过在键图词典中引入各种标准元素来开发模型。在植物的所有抗性元素中，茎木木质部抗性和气孔抗性通过每日变化建模。在黑暗中，植物的茎木质部抗性值为最大值（2.96x10（7）MPa s / m（3）），最小值为（2.4x10（7）MPa s / m（3））。期。实现气孔导度的Jarvis-Stewart型模型可用于增强气孔阻力。该模型还包含了在欧姆定律的帮助下制定的蒸腾过程。通过考虑边界层，空气动力学，环境温度，相对湿度和整体太阳辐射来引入植被的热行为。针对特定种类的植物和特定景点执行模拟。最后，考虑了各种环境和物理影响因素来研究植物模型的响应，并且这种建模技术为现场测量提供了一种新颖的建模策略。在白天，恒定水势为-0.15 MPa时的蒸腾流量在1.2x10（-8）至2.25x10（-8）m（3）/ s之间变化。在每天的凌晨，蒸腾速率达到最大值约2.0x10（-8）m（3）/ s，而太阳辐射的值约为700 Wm（-2）。在干燥周期的第5天，叶片水势消耗至-1.5 MPa的最小值。

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