K+ uptake by root systems grown in soil under salinity: II. Sensitivity analysis

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3 Scopus citations

Abstract

A numerical algorithm for the solution of multicomponent transport of Ca2+, Mg2+, Na+, K+, Cl- in soil and their uptake by plant roots has been developed. The model emphasizes adsorptiondesorption due to cation exchange mechanism, dissolution-precipitation of CaCO3, and pH changes at the root surface controlled by the anion-cation influx balance. A fully implicit finite difference scheme is used for numerical implementation. Sensitivity analysis was conducted to evaluate the effect of each parameter on nutrient uptake. Each parameter (independent of all others) was varied between 0.25 to 4 times its speculated 'average' level. Predicted K+ uptake was found to be more sensitive to changes of root radius and the parameter indicating maximal influx of K+. Effective diffusion coefficient and soil moisture are less influential. The influence of CaCO3 dissolution and different kinds of boundary conditions were also considered.

Original languageEnglish
Pages (from-to)123-141
Number of pages19
JournalTransport in Porous Media
Volume14
Issue number2
DOIs
StatePublished - 1 Feb 1994

Keywords

  • Cation exchange
  • dissolution and precipitation
  • finite differences
  • ion uptake
  • multicomponent transport
  • permeability of root surface
  • sensitivity analysis
  • soil moisture
  • soil salinity

ASJC Scopus subject areas

  • Catalysis
  • General Chemical Engineering

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