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| Effects of different types of soil conditioners on the migration and transformation of Cd in the soil-rice system |
| Received:September 10, 2024 |
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| KeyWord:Cd;rice;soil conditioner;migration and transformation;restoration and remediation |
| Author Name | Affiliation | E-mail | | LI Yizhuang | College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, China
Institute of Plant Protection and Soil Fertilizer, Hubei Academy of Agricultural Sciences/Key Laboratory of Fertilization from Agricultural Wastes, Ministry of Agriculture and Rural Affairs/Hubei Engineering Research Center for Agricultural Environmental Control, Wuhan 430064, China
Key Laboratory of Agro-Environment in Midstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Changsha 410125, China | | | PENG Ruixue | Tianmen City Bureau of Arable Land Quality Protection and Fertilizer Management, Tianmen 431799, China | | | CHEN Jing | Daye Ecological Energy Promotion Service Center, Daye 435100, China | | | CHEN Chen | Institute of Plant Protection and Soil Fertilizer, Hubei Academy of Agricultural Sciences/Key Laboratory of Fertilization from Agricultural Wastes, Ministry of Agriculture and Rural Affairs/Hubei Engineering Research Center for Agricultural Environmental Control, Wuhan 430064, China | | | LI Fangmin | College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, China | lifangmin@yeah.net | | LIU Bo | Institute of Plant Protection and Soil Fertilizer, Hubei Academy of Agricultural Sciences/Key Laboratory of Fertilization from Agricultural Wastes, Ministry of Agriculture and Rural Affairs/Hubei Engineering Research Center for Agricultural Environmental Control, Wuhan 430064, China | | | YANG Li | Institute of Plant Protection and Soil Fertilizer, Hubei Academy of Agricultural Sciences/Key Laboratory of Fertilization from Agricultural Wastes, Ministry of Agriculture and Rural Affairs/Hubei Engineering Research Center for Agricultural Environmental Control, Wuhan 430064, China | | | HONG Jun | Institute of Plant Protection and Soil Fertilizer, Hubei Academy of Agricultural Sciences/Key Laboratory of Fertilization from Agricultural Wastes, Ministry of Agriculture and Rural Affairs/Hubei Engineering Research Center for Agricultural Environmental Control, Wuhan 430064, China
Key Laboratory of Agro-Environment in Midstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Changsha 410125, China | 15527816828@163.com |
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| Abstract: |
| To explore the influence of diverse soil conditioners on the migration and transformation of cadmium（Cd）within the soil-rice system, a controlled pot experiment was implemented. This study comprised five distinct treatments：two inorganic soil conditioner treatments（ISC1 and ISC2）, two organic soil conditioner treatments（OSC1 and OSC2）, and a blank control（CK）, with an addition rate of 2% for each. The study investigated the effects of various soil conditioners on soil physicochemical properties, Cd speciation, Cd concentration in different parts of rice plants, Cd enrichment and transport coefficients, and the expression of Cd absorption and transport genes in rice roots throughout the growth period. The results showed that compared to the CK treatment, all four soil conditioners significantly reduced the Cd content in rice grains（P＜0.05）, with reduction rates of 37.82%（OSC1）, 68.21%（OSC2）, 69.14%（ISC2）, and 83.96%（ISC1）, respectively. At rice maturity, inorganic and organic conditioners significantly increased soil pH by 1.19-1.29 units and soil organic matter content by 31.90%-45.58%（P＜0.05）respectively, compared to the CK. They also tended to transform the more active Cd in soil towards residual and organically bound forms, respectively. Inorganic conditioners had a greater impact on Cd transport within rice plants and the expression of Cd absorption and transport genes than organic conditioners. The study demonstrates that both inorganic and organic conditioners reduce Cd content in rice grains by directly or indirectly affecting soil physicochemical properties, soil Cd bioavailability, and Cd absorption and transport within rice plants, thus achieving remediation and management of Cd pollution in paddy fields. |
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