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Weighting the differential water capacity to account for declining hydraulic conductivity in a drying coarse-textured soil

机译：权衡不同的水容量以解决干燥的粗糙结构土壤中的水力传导率下降

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摘要

Water availability to plants growing in coarse-textured soils during a drying cycle relies on the declining abilities of the soil to release water (differential water capacity) and to deliver it to the plant (unsaturated hydraulic conductivity) under varying evaporative demand. In this context, the availability of water can be quantified using the concept of the integral water capacity, IWC, in which the differential water capacity is weighted by means of a restrictive hydraulic function before integrating. We argue here that the diffusivity is an appropriate component of the restrictive hydraulic function, which leads to the employment of the so-called matric flux potential' (which we propose to re-name as the matric flux transform'). As the starting point to apply the diffusivity function, we choose the inflection point of the water-retention curve drawn on semi-log paper, which, for the Groenevelt-Grant equation, occurs at a matric head, h, of precisely k(0) metres. An illustrative example of the procedures is provided for a coarse-textured soil, which reveals that the restrictive function may not be sufficiently restrictive for all cases. We therefore apply an additional weighting coefficient to account for varying sensitivity of different plants to hydraulic restrictions.
机译：在干燥循环中生长在粗糙结构土壤上的植物的水可用性取决于土壤在不断变化的蒸发需求下释放水分（水的不同能力）并输送到植物中的能力（不饱和的水力传导率）下降。在这种情况下，可以使用总水容量IWC的概念来量化水的可用性，其中积分水的差异水通过限制液压功能在集成之前进行加权。在这里，我们认为扩散率是限制性水力函数的适当组成部分，这导致使用所谓的“矩阵通量势”（我们建议将其更名为“矩阵通量变换”）。作为应用扩散函数的起点，我们选择在半对数纸上绘制的保水曲线的拐点，对于Groenevelt-Grant方程，该拐点出现在精确地为k（0 ）米。针对粗糙纹理的土壤提供了该过程的一个说明性示例，这表明限制功能可能无法在所有情况下都充分限制。因此，我们应用了一个额外的加权系数，以说明不同工厂对水力限制的敏感性变化。

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