【摘 要】
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Cadmium(Cd)contamination in paddy soil has caused public concern.The uptake of Cd by rice plants depends on soil Cd mobility,which is in turn substantially infl
【机 构】
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Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria,Tianjin Key L
论文部分内容阅读
Cadmium(Cd)contamination in paddy soil has caused public concern.The uptake of Cd by rice plants depends on soil Cd mobility,which is in turn substantially influenced by or-ganic matter(OM).In this review,we first summarize the fate of Cd in soil and the role of OM.We then focus on the effects of OM on Cd mobility in paddy soil and the factors influ-encing the remedial effectiveness of OM amendments.We further discuss the performance of straw incorporation in the remediation of Cd-contaminated paddy soils reported in lab-oratory and field studies.Considering the huge production of organic materials(such as straw)in agriculture,the use of natural OM for soil remediation has obvious appeal due to the environmental benefits and low cost.Although there have been successful application cases,the properties of OM amendments and soil can significantly affect the remedial per-formance of the OM amendments.Importantly,straw incorporation alone does not often decrease the mobility of Cd in soil or the Cd content in rice grains.Careful evaluation is required when considering natural OM amendments,and the factors and mechanisms that influence their remedial effectiveness need further investigation in paddy soil with realistic Cd concentrations.
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