Fig. 7.

Root system with laterals: the left panel illustrate the conceptual root system. The two other subplots show ${\mathit{\kappa }}_{+,\mathrm{lat}}$ as a function of ${\mathrm{K}}_{\mathrm{lat}}$, ${\mathrm{d}}_{\mathrm{inter}}$ with increasing ${\mathrm{k}}_{\mathrm{r}}$ (left) and increasing ${\mathrm{k}}_{\mathrm{x}}$ (right) (from light to dark blue in both figures). The asymptotic conductance of an unbranched root system is given by the horizontal dashed lines