| 陈灿明,卫泽斌,彭建兵,吴启堂.土壤有效态镉与稻米镉污染风险广东案例研究[J].农业环境科学学报,2022,41(2):295-303. |
| 土壤有效态镉与稻米镉污染风险广东案例研究 |
| Risk assessment of cadmium contamination of rice using soil available cadmium in paddy fields： Case studies of Guangdong Province， China |
| 投稿时间：2021-09-24 |
| DOI：10.11654/jaes.2021-1092 |
| 中文关键词: 稻米 镉 有效态镉 提取剂 污染风险 预测 |
| 英文关键词: brown rice cadmium available cadmium extractant pollution risk prediction |
| 基金项目:广东省特支计划本土创新团队项目（2019BT02L218）；广东省农业厅农业科技创新及推广体系建设项目（2020KJ262） |
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| 中文摘要: |
| 为了科学评估土壤镉（Cd）污染造成的稻米Cd超标风险，以广东省韶关市（酸性土壤）和汕头市（中性土壤）Cd污染稻田为研究对象，对土壤与稻米配对样品进行回归分析，比较了两种提取剂（CaCl2和DTPA）对土壤Cd的提取能力以及对稻米Cd含量的反映能力，以探讨适用于不同pH土壤的有效态Cd提取方法，建立最佳稻米Cd累积预测模型，并推导出土壤有效态Cd的风险阈值。结果表明：CaCl2提取剂对Cd的提取能力小于DTPA；两种提取剂对酸性土壤Cd的提取能力显著高于近中性土壤。与土壤全Cd相比，有效态Cd含量可更好地预测稻米Cd含量。CaCl2提取剂适用于全部试验区的酸性、中性土壤；DTPA适用于汕头市中性土壤，但不适用于韶关市酸性土壤。利用CaCl2-Cd进行线性方程拟合，得到了最佳的稻米Cd预测模型。韶关市的早稻、晚稻预测模型各包含20个水稻品种，其土壤CaCl2-Cd阈值分别约为0.10 mg·kg-1和0.05 mg·kg-1。研究表明，基于CaCl2-Cd的稻米Cd预测方法和阈值可指导广东省Cd污染稻田安全利用，并对其他酸性土Cd污染区具有参考意义。 |
| 英文摘要: |
| Rice(Oryza sativa L.) is a staple crop in China and has the potential for high accumulation of cadmium(Cd). The Cd in rice can enter the human body through food chain, posing a great threat to human health. To evaluate the Cd contamination risk of rice and safeguard the food safety, the present study was carried out to compare the ability of different extractants to extract available Cd from soil and the ability to reflect Cd content in rice, to establish the best prediction model for Cd accumulation in rice grain and to deduce the risk threshold of soil available Cd. Cd contaminated paddy fields in Shaoguan and Shantou, Guangdong Province, were selected to represent the acid soil region and the neutral soil region, respectively. The paired samples of soil and rice were taken to analyze their Cd content. The results showed that the extraction ability of CaCl2 was lower than that of DTPA for the same soil, and both extractants extracted more Cd from acid soils than from neutral soils. Compared with the total Cd, available Cd index had a better ability to predict Cd content in rice grain. CaCl2 was suitable for the extraction of available Cd from acidic and neutral soils from both regions, while DTPA was only suitable for neutral soils from Shantou but not for acidic soils from Shaoguan. The best prediction models of Cd content in rice were obtained using CaCl2-Cd to fit the linear regression with rice Cd. Based on the calculation of the models, the soil CaCl2-Cd thresholds for Shaoguan early rice(20 cultivars) and late rice(20 cultivars) were about 0.10 mg·kg-1 and 0.05 mg·kg-1, respectively. This study indicates that the prediction method and threshold of rice cadmium based on CaCl2-Cd can guide the safe utilization of Cd contaminated paddy fields in Guangdong Province and serve as a relevant reference for other Cd contaminated areas with acid soils. |
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