Dynamics of transfer and distribution of ~(95)Zr in the broadbean-soil ecosystem

摘要

The transfer and distribution of ~(95)Zr in a simulated broadbean-soil system was studied by using isotope-tracer techniques. The results showed that the ~(95)Zr was mainly concentrated in the haulm, pod and root, and the activity concentration of ~(95)Zr in these tissues reached the maximum in the initial stage then decreased continuously. The activity concentration of ~(95)Zr in edible part-bean was relatively lower, which was just near to the detection limit. The ~(95)Zr in soil was mainly (97%) deposited in surface layer soil (0-6 cm), indicating that the ~(95)Zr absorbed by surface soil could not be moved downwards easily because of the strong adsorption. The dynamics of ~(95)Zr concentrations in broadbean and soil were also confirmed by application of nonlinear regression method.