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Analysis of Soil Water Response to Grass Transpiration

机译：土壤水分对草蒸腾作用的响应分析

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This paper focuses on numerical modelling of soil water movement in response to the root water uptake that is driven by transpiration. The flow of water in a lysimeter, installed at a grass covered hillslope site in a small headwater catchment, is analysed by means of numerical simulation. The lysimeter system provides a well defined control volume with boundary fluxes measured and soil water pressure continuously monitored. The evapotranspiration intensity is estimated by the Penman-Monteith method and compared with the measured lysimeter soil water loss and the simulated root water uptake. Variably saturated flow of water in the lysimeter is simulated using one-dimensional dual-permeability model based on the numerical solution of the Richards’ equation. The availability of water for the root water uptake is determined by the evaluation of the plant water stress function, integrated in the soil water flow model. Different lower boundary conditions are tested to compare the soil water dynamics inside and outside the lysimeter. Special attention is paid to the possible influence of the preferential flow effects on the lysimeter soil water balance. The adopted modelling approach provides a useful and flexible framework for numerical analysis of soil water dynamics in response to the plant transpiration.
机译：本文着重于对土壤水分运动响应于蒸腾作用引起的根系水分吸收的数值模拟。通过数值模拟分析了安装在小源头集水区草覆盖的山坡站点上的渗漏计中的水流。溶渗仪系统提供了定义明确的控制体积，其中测量了边界通量并连续监测了土壤水压。蒸散强度通过Penman-Monteith方法估算，并与测渗仪土壤水分流失和模拟的根系吸水量进行比较。基于理查兹方程的数值解，使用一维双渗透模型模拟溶渗仪中的水的饱和饱和流。根系水分吸收的水有效性取决于对植物水分胁迫函数的评估，该评估已整合到土壤水流模型中。测试了不同的下边界条件，以比较溶渗仪内部和外部的土壤水分动力学。要特别注意优先流动效应对溶渗仪土壤水平衡的可能影响。所采用的建模方法为响应植物蒸腾作用的土壤水分动力学数值分析提供了一个有用且灵活的框架。

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