Effects and Stability of Comprehensive Measures for Mitigating Rice Cadmium Accumulation in Large Fields
Restoration for cadmium(Cd)accumulation was implemented in the lightly to moderately Cd-polluted paddy fields in Luyang Town,Zhongfang County for five consecutive years.The specific measures included regulating acids with lime-based composite materials,simultaneously passivating Cd and arsenic(As),applying manure,and optimizing water management in the field.The results showed that after the implementation of comprehensive control measures,the average Cd content in rice decreased and the Cd compliance rate remained stable at above 88.6%after the second year.Moreover,the compliance rates of As,lead,and mercury in rice all remained stable at above 97.28%.The implementation of the measures increased soil pH by 0.61-1.28,decreased the soil organic matter by 1.62%-13.78%,and reduced available Cd in soil by 41.41%-51.17%.The Cd enrichment factor in rice had a significantly negative correlation with soil pH,which indicated that the increase in soil pH was an important reason for the reduction in the Cd content in rice.
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