Table 1.
Summary of parameters used and their source.
| Parameter | Value |
|---|---|
| Root hydraulic conductivity, Lp | 5.5 × 10−8 ms−1MPa−1 (Unless otherwise stated) |
| Solute permeability, km | 3 × 10−9 ms−1 (Unless otherwise stated) |
| Reflection coefficient, σm | 0.5 (Unless otherwise stated) |
| Axial xylem water permeability, kax | 5 × 10−13 m2 |
| Dynamic viscosity, μ | 1.002 × 10−3 Pa s |
| Water density, ρ | 1.0 × 103 kg m−3 |
| Relative permittivity, ϵr | 80 |
| Thickness of epidermis | 15 μm |
| Thickness of cortex | 20 μm |
| Thickness of endodermis | 10 μm |
| Thickness of pericycle | 5 μm |
| Radius of xylem | 3 μm |
| Concentration of ions in soil | 100 mM |
Unless otherwise stated the transport parameters in the radial and axial directions are assumed to be equal. Root hydraulic conductivity was obtained from Javot et al. (2003), Ranathunge and Schreiber (2011), and Sutka et al. (2011). Solute permeabilities were obtained from Ranathunge and Schreiber (2011). Reflection coefficients were obtained from Boursiac et al. (2005) and Ranathunge and Schreiber (2011). Axial water permeability in the xylem was calculated using Poiseuille's Equation. The thicknesses of the root sections were obtained from Dolan et al. (1993), Scheres et al. (1995), Mattsson et al. (1999), Casimiro et al. (2003), and Javot et al. (2003).