Effects of Amendments on Cadmium Passivation in Acidic Soils with Vegetable Production
With increasing heavy metal pollution in soil and agricultural products,it is urgent to take actions to remediate heavy metal-polluted soils with vegetable production and reduce the risks of heavy metal pollution in vegetables.In order to explore the applicability of different amendments on acidic soil and their potential in inhibiting absorption of Cd from soil by vegetable,vegetable field experiments were carried out in three different fields with varied pH(T1,T2 and T3).Five amend-ments(fly ash,calcium-based bentonite,cadmium-kang,sepiolite,and biochar)and five popular commercially available vegetables(chinese cabbage,cabbage,lettuce,compact cauliflower,scattered cauliflower)were investigated in field experi-ments to study the effects of different amendments on the concentration of available Cd in acidic soil and the Cd concentration in vegetables.The results showed that amendments significantly affected the physical and chemical properties of vegetable soil.Calcium bentonite had clear soil Cd passivation effects.Sepiolite obviously inhibited Cd absorption in vegetables.The five vegetables can be divided into low enrichment group(compact cauliflower,scattered cauliflower,chinese cabbage,cab-bage)and high enrichment group(lettuce)in terms of Cd absorption capacity based on cluster analysis.Principal component analysis showed that the Cd concentrations in vegetables were positively correlated with total Cd and available Cd in soil,and significantly negatively correlated with soil pH.To conclude,using suitable amendments(biochar,sepiolite)in vegetable pro-duction systems with low Cd enrichment capacity is an effective measure to reduce the risks of heavy metal pollution and en-sure the safe production of vegetables in acidic soil.
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