Remediation Potential of Helianthus Tuberosus on Cadmium,Lead and Zinc Compound Contaminated Soil
Helianthus tuberosus is one of cash crop with features of great biomass,vigorous growth and easy cultivation.To study the re-mediation potential of Helianthus tuberosus on cadmium(Cd),lead(Pb)and zinc(Zn)contaminated soil,pot experiment and field experiment were carried out to explore the characteristics of the tolerance,accumulation,removal rate and repair potential of Helianthus tuberosus to combined pollution of Cd,Pb and Zn.With the increase of Cd,Pb and Zn contents in potted soil,the plant length and bi-omass of Helianthus tuberosus first decreased,then increased and then decreased,SOD activity first increased,then decreased and then increased,CAT enzyme activity first increased and then decreased.The activity of POD enzyme increased gradually.The BCF of Cd was between 1.08 and 1.79,the TF of the Cd was between 2.05 and 6.27,and the maximum accumulation of Cd in the shoots was 98.25 mg/kg.The BCF of Pb was between 0.77 and 1.31,the TF of the Pb was between 3.41 and 5.67,and the maximum accumu-lation of Pb in the shoots was 585.81 mg/kg.The BCF of Zn was between 0.44 and 0.79,the TF of the Zn was between 1.69 and 3.33,and the maximum accumulation of Zn in the shoots was 2 668.04 mg/kg.In the field experiment,the contents of Cd,Pb and Zn in the shoots of Helianthus tuberosus ranged from 125.79 to 201.08 mg/kg,1 075.99 to 1 525.46 mg/kg,6 896.21 to 7 443.66 mg/kg,respectively,and the annual removal rates of Cd,Pb and Zn by planting Helianthus tuberosus twice per mu of contaminated soil were 5.16％-9.04％,10.84％-16.90％and 4.60％-5.46％respectively.Helianthus tuberosus has certain tolerance and accu-mulation capacity to Cd,Pb and Zn combined stress.It can be used as a potential hyperaccumulator germplasm resource for remedia-tion of Cd,Pb and Zn combined pollution soil,and has good application prospects.
phytoremediationHelianthus tuberosuscompound contaminated soilheavy metal
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