Effects of Sulfur on Growth,Cadmium Absorption and Accumulation in Hyperaccumulator-Sedum alfredii Hance

The effects of sulfur on growth,cadmium absorption and accumulation in hyperaccumulator-Sedum alfredii Hance were investigated in hydroponic culture.Biomass,Cd contents and amounts of Cd accumulated of leaves,stems and roots of Sedum alfredii Hance were in the order of leavesstemsroots and Cd100Cd10,showed Sedum alfredii Hance hyperaccumulated charactreristics of Cd.With increasing S supplies from 1.5 to 2.25 mmol/L,biomass,Cd contents,amounts of Cd accumulated in leaves,stems and roots,total amounts of Cd accumulated of Sedum alfredii Hance were increased significantly.It was also found that there were a higher ratio of shoot Cd accumulation /roots Cd(S/R1) in any S and Cd treatments,suggesting that appropriate S application enhanced Cd absoption,translocation from root to shoot in Sedum alfredii Hance.From these results indicated that sulfur-induced Cd requirementwas evident in Sedum alfredii Hance.With respect to phytoremediation,the application of S at appropriate rates may be useful approach to enhancing the growth and Cd accumulation in Sedum alfredii Hance for phytoremediation of the Cd-contaminted soils.Cd uptake efficiency and translocation efficiency of Sedum alfredii Hance were increased with increasing S supplies and the relationship coluld be described by logarithmic equation and linear equation,respectively.