Method to Predict Soil Cd Concentration Changes by Phytoextraction with Arabidopsis halleri ssp. gemmifera in a Cd-contaminated Andisol Field

Abstract

The duration required to meet target cadmium (Cd) concentrations in soils or foods is an important factor to determine feasibility of phytoextraction systems. In addition, changes in Cd concentrations by repeated cropping with a phytoextraction plant in fields is required to estimate this duration. Therefore, we developed a method to predict Cd concentration changes by repeated cropping with Arabidopsis halleri ssp. gemmifera in Cd-contaminated Andisol fields using pot experimental data. The method was composed of a balance equation of Cd in the field and a relational expression between soil Cd concentrations and Cd concentrations of the plant (above-ground part) obtained from pot and field experiments. Then, the validity of the method was confirmed by comparison with values measured in the field. Cd concentration changes calculated by this method agreed well with the values measured in the field. Therefore, this method makes it possible to predict the duration required to remediate Cd-contaminated Andisols using Arabidopsis halleri ssp. gemmifera.