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| Prediction model for the accumulation of cadmium in rice in typical paddy fields of south China |
| Received:February 06, 2018 |
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| KeyWord:brown rice;soil properties;paddy soils in south China;rice variety types;influencing factors;prediction model |
| Author Name | Affiliation | E-mail | | XIONG Jie | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | ZHU Qi-hong | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | | | HUANG Dao-you | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | dyhuang@isa.ac.cn | | ZHU Han-hua | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | | | XU Chao | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | | | WANG Shuai | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | | | WANG Hui | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | |
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| Abstract: |
| Cadmium(Cd) pollution in paddy soil is an increasingly serious problem in southern China. Establishing a prediction model for the accumulation of Cd in paddy rice is of great significance to guide the remediation of Cd-contaminated paddy soils and control the risk of Cd pollution. To construct simulation models of Cd accumulation in paddy rice for southern China, 90 pairs of soil and brown rice samples were collected from typical paddy fields in Hunan Province. The concentrations of Cd in brown rice, total Cd, CaCl2 extractable Cd in soil, and basic soil properties were determined. Further, the relationships between Cd concentration in rice and soil properties were analyzed using correlation analysis and stepwise regression. The results indicated that the concentrations of Cd in brown rice were mainly related to the available Cd content rather than the total Cd content in paddy soils. Moreover, the presence of available iron(Fe), manganese(Mn), and organic matter in soil, and the varieties of paddy rice also played important roles in Cd accumulation in brown rice. The simulation model of Cd accumulation in brown rice based on available Cd, Mn, Fe, and organic matter in soils showed high accuracy(P<0.001, R2=0.52) independent of rice variety. Furthermore, simulation models based on the above four soil factors could also predict the accumulation of Cd in conventional rice varieties(P<0.001, R2=0.47) and hybrid rice varieties(P<0.001, R2=0.67). |
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