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

Alex Yakirevich; Shaul Sorek; Moshe Silberbush

doi:10.1007/BF00615197

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

Alex Yakirevich, Shaul Sorek, Moshe Silberbush

Research output: Contribution to journal › Article › peer-review

4 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 C_aCO₃ dissolution and different kinds of boundary conditions were also considered.

Original language	English
Pages (from-to)	123-141
Number of pages	19
Journal	Transport in Porous Media
Volume	14
Issue number	2
DOIs	https://doi.org/10.1007/BF00615197
State	Published - 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

Access to Document

10.1007/BF00615197

Cite this

@article{cb4a999970024970b45dfb104d4c73e8,

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

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.",

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

author = "Alex Yakirevich and Shaul Sorek and Moshe Silberbush",

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T1 - K+ uptake by root systems grown in soil under salinity

T2 - II. Sensitivity analysis

AU - Yakirevich, Alex

AU - Sorek, Shaul

AU - Silberbush, Moshe

PY - 1994/2/1

Y1 - 1994/2/1

N2 - 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.

AB - 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.

KW - Cation exchange

KW - dissolution and precipitation

KW - finite differences

KW - ion uptake

KW - multicomponent transport

KW - permeability of root surface

KW - sensitivity analysis

KW - soil moisture

KW - soil salinity

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