有根系时蒸发的一个简单解析模型
A Simple Analytical Model of Evaporation in the Presence of Roots
摘要：
根系可以影响水分从多孔介质中蒸散的动态。蒸散耦合仍然是影响整体根系行为的一个关键方面。在根系存在的情况下预测蒸散曲线有助于跟踪多孔介质中剩余的水量。使用一个控制的视觉设置的2D模型土壤系统组成的单分散玻璃珠，我们首先进行实验，在不同的相对湿度条件下生长在部分饱和系统的实际根。我们记录的参数，如总质量损失的介质和由此产生的位置的后退前，并使用这些实验结果开发一个简单的分析模型，预测的蒸发前的位置作为时间的函数，以及由于蒸发和蒸腾的综合效应从介质中损失的水的总量。该模型是基于蒸发通量的基本原理，并包括在叶片中的气孔数量和制度1和制度2之间的过渡时间的经验假设。该模型还强调了一个更长的根寿命的重要性，只要根是暴露在一个部分饱和的空气和水的混合物组成的区域。模型和实验结果之间的比较表明，很好的预测的蒸发锋的位置，以及在存在真正的根系蒸散的总质量损失。这些结果为复杂的蒸发现象及其对根系机制的影响提供了进一步的理解。
英文摘要：
Root systems can influence the dynamics of evapotranspiration of water out of a porous medium. The coupling of evapotranspiration remains a key aspect affecting overall root behavior. Predicting the evapotranspiration curve in the presence of roots helps keep track of the amount of water that remains in the porous medium. Using a controlled visual set-up of a 2D model soil system consisting of monodisperse glass beads, we first perform experiments on actual roots grown in partially saturated systems under different relative humidity conditions. We record parameters such as the total mass loss in the medium and the resulting position of the receding fronts and use these experimental results to develop a simple analytical model that predicts the position of the evaporating front as a function of time as well as the total amount of water that is lost from the medium due to the combined effects of evaporation and transpiration. The model is based on fundamental principles of evaporation flux and includes empirical assumptions on the quantity of stoma in the leaves and the transition time between regime 1 and regime 2. The model also underscores the importance of a much prolonged root life as long as the root is exposed to a partially saturated zone composed of a mixture of air and water. Comparison between the model and experimental results shows good prediction of the position of the evaporating front as well as the total mass loss from evapotranspiration in the presence of real root systems. These results provide additional understanding of both complex evaporation phenomenon and its influence on root mechanisms.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
