摘要
Phytoremediation is a new technique for cleaning contaminated soils. This method in comparison with the other techniques is very simple and low cost. Among the pollutants, heavy metals and specially cadmium （Cd） is very important because of its high movement in soil and high toxicity. Bioavailability of metals in the soil is affected by various factors including saline solution. In fact there are symptoms for increasing Cd uptake due to increasing C1＂1 concentration in soil solution. The objective of this study was to investigate the effect of saline irrigation water on cadmium uptake and remediability of soil with Brassica napus （rapeseed） in greenhouse experiment. Saline waters of 0, 1.5 and 2.5 dS/m was applied on soil with different concentrations of Cd （5, 10, 20, 30 and 50 ppm） during the cultivation period of Okapi （fall rapeseed variety）. The results of this study showed that there are no significant differences in shoot dry matter exposed to Cd, but root dry matter decreased with increasing Cd concentration （p〈5%）. Salinity had a significant effect （p〈l%） on Cd concentration in roots and increased from 26.83 （in control） to 36.46 mg.kg-1 dry wt （in 2.5 dS.m＂l treatment）. The significant effect （p〈5%） was found in shoots as well and the Cd uptake was increased from 2.14 to 3.25 mg.m^-1dry wt in control and 2.5 dS＇m^-1 treatments respectively. Likewise, salinity increased bioaccumulation coefficient, whereas had no significant effect on transport factor. The obtained results showed that Cd metal tend to accumulate more in the roots ofBrassica napus than in the shoots.
