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Influence of root resistivity on plant water uptake mechanism, Part II: analytical solutions for low/moderate soil-root conductivity ratio

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Abstract

A one-dimensional approximate analytical model, which preserves the main features of soil-crop-atmospheric hydrodynamics, has been suggested for plant roots of low soil-root conductivity ratio (SRCR). The proposed approach involves physically based concepts, such as mass balance equation, Darcy’s law, and related water uptake and plant transpiration functions. Two main assumptions have been made to derive the analytical solution: (1) gravitational flow is adopted and (2) the uniform soil moisture distribution within the root water activity zone is supposed. The mass balance equation in its integral form is solved by the method of characteristics. This leads to the two functional equations for soil pressure head and root potential, which can be solved simultaneously by using common software. The model has been further verified against the numerical one. The model represents a reasonable compromise between the complicated mechanism of unsaturated water flow with root water uptake (RWU) and still insufficient knowledge of the soil-plant-atmospheric continuum. It is able to account for temporal fluctuations in root activity zone and provides a relatively simple algorithm for investigation of RWU-mechanism. Besides the theoretical and applicative importance, this flow model yields water and velocity distributions within soil profile, and, thereby, constitutes a preliminary step toward solution of contaminant transport problems in vadose zone.

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Authors and Affiliations

  1. Faculty of Civil and Environmental Engineering, Israel Institute of Technology, Technion City, Haifa, 32000, Israel

    Anna Levin, Abraham Shaviv & Peter Indelman

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  1. Anna Levin
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  2. Abraham Shaviv
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  3. Peter Indelman
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Correspondence to Anna Levin.

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Levin, A., Shaviv, A. & Indelman, P. Influence of root resistivity on plant water uptake mechanism, Part II: analytical solutions for low/moderate soil-root conductivity ratio. Transp Porous Med 70, 81–95 (2007). https://doi.org/10.1007/s11242-006-9085-0

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  • DOI: https://doi.org/10.1007/s11242-006-9085-0

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