Phytoextraction and Migration Patterns of Cadmium in Contaminated Soils by .

This study was conducted to identify soil cadmium (Cd) removal pathways and their contribution rates during phytoremediation by , as well as to comprehensively assess its phytoremediation potential. Multilayered soil column tests and farmland-simulating lysimeter tests were conducted to investigate the Cd phytoextraction and migration patterns in topsoil and subsoil simultaneously. The aboveground annual yield of grown in the lysimeter was 206 ton·ha. The total amount of Cd extracted in shoots was 234 g·ha, which was similar to that of other typical Cd-hyperaccumulating plants such as . After the test, the topsoil Cd removal rate was 21.50-35.81%, whereas the extraction efficiency in shoots was only 4.17-8.53%. These findings indicate that extraction by plant shoots is not the most important contributor to the decrease of Cd in the topsoil. The proportion of Cd retained by the root cell wall was approximately 50% of the total Cd in the root. Based on column test results, treatment led to a significant decrease in soil pH and considerably enhanced Cd migration to subsoil and groundwater. decreases Cd in the topsoil through multiple pathways and provides a relatively ideal material for phytoremediation of Cd-contaminated acid soils.