Preliminary Research on Cadmium Uptake,Accumulation and Tolerance in Salix

Salix has its special characteristic and some uptake and accumulation capacity for cadmium pollution in the environment.Two hybrid Salix clones were used to be tested in water for thirty-four days.The results indicated that cadmium concentration in leaf increased with cadmium mass concentration in solution and time prolonging.When cadmium mass concentration was 0～20(mg/L) in water,cadmium concentration in leaf of two Salix clones was increased slowly before 15 days and fast after 15 days,cadmium concentration increasing in leaf with cadmium mass concentration in solution was different in different Salix clones.The cadmium concentration in different parts of plant is in the order of rootleafstem,cadmium concentration in root of first clone was lower than third clone and first clone was higher than third clone in stem and leaf.When cadmium mass concentration was 0～20(mg/L) in water,the total cadmium uptake in different parts of plant is in the order of rootleafstem.The quantity of cadmium uptake in all parts of first clone was higher than third clone.When cadmium mass concentration was 5(mg/L) in solution,there was a great deal of Cd in root,cadmium concentration in overground of plant was more and more with cadmium mass concentration increasing in solution. The growth in Salix had not been distinctly restrained when the cadmium mass concentration is under 20(mg/L).