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| Effects of exogenous sodium sulfide on cadmium migration and accumulation in soil and rice plant systems |
| Received:January 17, 2021 |
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| KeyWord:sodium sulfide;cadmium（Cd）;rice;soil;accumulation;migration |
| Author Name | Affiliation | E-mail | | GUAN Di | Hunan Academy of Agriculture Sciences/Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River Ministry of Agriculture/Key Lab of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China | | | WU Jiamei | Hunan Academy of Agriculture Sciences/Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River Ministry of Agriculture/Key Lab of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China | | | LIU Zhaobing | Hunan Academy of Agriculture Sciences/Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River Ministry of Agriculture/Key Lab of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China | | | CHEN Shan | Hunan Academy of Agriculture Sciences/Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River Ministry of Agriculture/Key Lab of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China | | | JI Xionghui | Hunan Academy of Agriculture Sciences/Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River Ministry of Agriculture/Key Lab of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China | jixionghui@sohu.com |
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| Abstract: |
| This study aimed to explore the effects of exogenous sodium sulfide application on the morphological change, migration, and accumulation of cadmium（Cd）in soil-rice plant systems, which could provide a practical sulfur fertilizer application strategy for the passivation of soil active Cd and decrease Cd content in grain. The study used soil culture and pot plant experimental methods to measure Cd migration changes and the accumulation in a soil –rice plant system with different application amounts of sodium sulfide. The results showed that rice yield under the 0.1 g·kg-1 Na2S treatment was significantly increased by 59% compared to the control. With the application of sodium sulfide, Cd accumulation in the organs and tissues of the rice plants was efficiently decreased. In the 0.5 g·kg-1 sodium sulfide treatment, Cd content in the roots and stems decreased by 76% and 70%, respectively, compared to the control. Among all the sodium sulfide treatments, Cd accumulation in grain was the lowest in the 0.3 g·kg-1 treatment, which was decreased by 68%. With further increase in the sodium sulfide dosage（greater than 0.3 g·kg-1）, decreased Cd content in the grain showed no significant difference. Therefore, appropriate sodium sulfide application could effectively passivate ionic Cd and DTPA-Cd content in the soil, and the passivation efficiency was 55% and 17%, respectively. It is speculated that S2- had REDOX reaction in the soil environment, and the sulfate formed alleviates the increase of soil pH to a certain extent. In brief, adding 0.3 g·kg-1 sodium sulfide could increase crop yield and effective in immobilizing Cd and inhibiting translocation of Cd into the grains, which is the optimum choice for soil Cd immobilization. |
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