Remediation Effect of Deep Plowing Combined with High Ridging on Cadmium-contaminated Acidic Purple Mud Paddy
A paired field experiment was conducted to compare the effect of conventional tillage and deep plowing combined with high-ridging tillage on Cd reduction in soil and crop organisms.The results showed that compared with conventional tillage,the biomass,Cd enrichment,and Cd removal efficiency of rape in deep plowing combined with high-ridging tillage treatment was increased by 22%～39%,28%～180%and 56%,respectively.The Cd concentration in rice stem and leaf,and root increased by 28%～57%and 27%～50%,respectively,whereas the concentration of Cd in brown rice was significantly reduced by 42%.In addition,the total Cd content in 0～30 cm soil was decreased by 11%～56%,and the content of diethylenetriamine pentaacetic acid extractable Cd(DTPA-Cd)in 15～30 cm soil was reduced by 59%.The Cd concentration in brown rice was significantly correlated with the soil DTPA-Cd content,plant Cd enrichment and transport coefficient.The application of deep plowing combined with high-ridging tillage in the rape season under rape-rice rotation ecosystem may reduce the concentration of Cd in brown rice by increasing the Cd removal efficiency of rape and reducing the total Cd,Cd bioavailability of soil,and Cd translocation of rice.
Brown rice CdRape-rice rotationPlough-layer reconstructionCd removal efficiencyBioconcentration and translocation
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