Abstract
At present, the remediation of heavy-metal-polluted cropland soil is a considerable problem. In this study, in situ immobilization field experiment was conducted by planting rice (Oryza sativa L.) in low Cd-contaminated paddy soil to determine the optimal soil amendment that would reduce the accumulation of Cd in brown rice. GL (main component is alkaline residue), FG (main components are Si and Ca), and SH (main component is lime) were utilized as amendments. The remediation effects of the amendments on the soil and rice were investigated, and the potential mechanisms of reducing Cd availability to rice were analyzed. Amendment application significantly increased the soil pH value, reduced the DTPA-extractable Cd concentrations, and shifted Cd species from the exchangeable Cd fractions to the carbonate-bound, Fe-Mn oxides and residual fractions in paddy soil. For the plant, amendment application apparently increased the concentrations of Ca in rice plants, which could compete with Cd in root uptake. Besides, amendment application also effectively restricted the translocation of Cd from roots to shoots and consequently led to a notable decrease of Cd concentration in brown rice. These results demonstrated that the FG ameliorant could be effective in reducing Cd bioavailability and accumulation in rice grown on low Cd-contaminated paddy soils.
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Abbreviations
- DTPA:
-
Diethylene triamine pentacetic acid
- CEC:
-
Cation exchange capacity
- PCA:
-
Principal component analysis
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Acknowledgments
This project was supported by the Science and Technology Planning Project of Guangdong Province, China (Grant No. 2014A020216019), the Natural Science Foundation of Guangdong Province, China (Grant No. 2015A030310221), and the Dean Fund of Guangdong Academy of Agricultural Sciences (Grant No. 201524).
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Li, Lf., Ai, Sy., Wang, Yh. et al. In Situ Field-Scale Remediation of Low Cd-Contaminated Paddy Soil Using Soil Amendments. Water Air Soil Pollut 227, 342 (2016). https://doi.org/10.1007/s11270-016-3041-6
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DOI: https://doi.org/10.1007/s11270-016-3041-6