Phytoremediation of Cd polluted saline soils by the halophyte Suaeda salsa
A pot experiment was conducted to investigate the growth responses to Cd and Na accumulation by Suaedasalsa under treatments of Cd (0-5.0 mg/kg) and NaCl (0.1％-1.0％).In soils containing0.5％ or 1.0％ NaCl,the growth of S.salsa was significantly inhibited.Plant biomass decreased with an increase of soil Cd,while Cd accumulation increased with an increase of NaCl content.In the roots,stems and leaves of S.salsa,the highest Cd concentrations were (35.3,30.1 and 30.9 mg/kg,respectively) in the 0.1％ NaCl and 2.5 mg/kg Cd treatments.The bio-concentration factors of Cd in the shoots were 0.9-19.9,and the Cd accumulation in shoots was 8.1-73.6 times that of the roots.Fresh weight,Cd and Na concentrations in the roots of S.salsa were significantly affected by NaCl and Cd interaction,however the interaction was not significant for the Cd and Na concentrations in the stems and leaves.In the presence of Cd,Na contents in the stems and leaves increased as the NaCl content increased,but with the same Na addition,Cd did not lead to significantly different Na contents compared with the control.On the contrary,NaCl enhanced the accumulation of Cd in S.salsa.Sodium accumulation of S.salsa was only affected by the NaCl treatments.These results showed that S.salsa was Cd-tolerant and may strongly accumulate Cd,making it suitable for the phytoremediation of Cd-contaminated saline soils.
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维普
