The physiological and ecological effects on Vetiveria zizanioides(V.zizanioides)grown in hydroponic culture under the stresses at different concentration of Cadmium(Cd)were studied.The experiment results showed that Cd mainly cumulated in the root.The highest Bioconentration factor(BF) was 34%.of Cd with a positive correlation with Cd cumulation in the root(r=0.987 4),while the concentration had a negative correlation with a tolerance index of the root(r=-0.943 6).The root activity and nitrate reductase(NR)...