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| Effects of different sulfur forms on cadmium uptake and accumulation in paddy rice |
| Received:October 09, 2020 |
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| KeyWord:paddy rice;sulfur form;K2SO4;K2S;cadmium |
| Author Name | Affiliation | E-mail | | LIU Ying | School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China | | | SU Guang-quan | School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China | | | GUO Xiang | School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China | | | YANG Yan-hua | School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China | | | YAO Ai-jun | School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China | yaoaijun@mail.sysu.edu.cn | | QIU Rong-liang | School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China
Lingnan Modern Agricultural Science and Technology Guangdong Laboratory, South China Agricultural University, Guangzhou 510642, China | | | TANG Ye-tao | School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China | |
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| Abstract: |
| To explore the effects of different forms of sulfur（SO42-/S2-）on rice biomass and Cd accumulation in brown rice， pot experiments were performed by adding 0（CK）or 400 mg S·kg-1（K2S/K2SO4）to farmland soil heavily contaminated with Cd and As. Soil samples were collected downstream from a metal mine in Guangdong Province. All tested soil samples were neutralized by CaCO3 under continuous flooding conditions. Compared to CK， K2S and K2SO4 treatments significantly increased total rice biomass by 130.1%~186.7%， but K2S treatment resulted in a greater increase in brown rice yield. The Cd content of brown rice was reduced by 37.5%~50.0% after K2S treatment and by 31.3%~45.0% after K2SO4 treatment. The Fe content of brown rice in both sulfur treatment groups also decreased by over 90%. K2S treatment inhibited the availability of Cd in the soil by promoting its transformation into Fe /Mn-oxide-bound and organic-sulfide-bound forms of Cd. Moreover， K2S treatment increased the S content of stems and leaves， which effectively sequestrated Cd into the vacuoles of stems and leaves， thus helping to reduce Cd translocation to the rice grain. Due to the increase in carbonate-bound and organic-sulfide-bound Cd formation， the amount of Cd available in the soil increased significantly after K2SO4 treatment under soil acidification and elevated reduction potential conditions. However， K2SO4 treatment was more effective than K2S treatment at sequestrating Cd into the vacuoles， which helped to limit Cd translocation to the shoot and grain. These results show that， after the adequate application of CaCO3， both tested sulfur forms， at their full dose， effectively reduce Cd content in brown rice and increase rice yield. |
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