A Finite-element Model of Radial and Axial Conductivities for Individual Roots: Development and Validation for Two Desert Succulents

Abstract

A morphologically explicit numerical model for analysing water uptake by individual roots was developed based on a conductor network, with specific conductors representing axial or radial conductivities for discrete root segments. Hydraulic conductivity (L p ; m s -1 MPa -1 ) was measured for roots of Agave deserti Engelm. and Opuntia ficus-indica (L.) Miller by applying a partial vacuum to the proximal ends of excised roots in solution. L p was also measured for 40- to 80-mm segments along a root, followed by measurements of axial conductivity and calculation of radial conductivity (...)