| 柳影,卢维盛,赵扬,李贵杰,李华兴,曾祖蕾,张秋华.不同污染类型水稻土中镉的化学形态分布特征及其影响因素[J].农业环境科学学报,2016,35(9):1703-1708. |
| 不同污染类型水稻土中镉的化学形态分布特征及其影响因素 |
| Cadmium fraction distribution and its influencing factors in paddy soils polluted by different pollution sources |
| 投稿时间：2016-01-21 |
| DOI：10.11654/jaes.2016-0103 |
| 中文关键词: 水稻土 镉 化学形态 影响因素 |
| 英文关键词: paddy soil cadmium chemical fraction affecting factor |
| 基金项目:国家自然科学基金项目（41271266） |
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| 摘要点击次数: 2506 |
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| 中文摘要: |
| 土壤Cd的活性不仅取决于其在土壤中的全量，更大程度上取决于化学形态。以广东省6种不同类型的污染水稻土为研究对象，通过BCR三步法对土壤中Cd的形态分布特征进行分析，并采用逐步回归法探讨了影响Cd化学形态的主要因素。结果表明：供试土壤Cd赋存形态均以酸提取态为主，根据RAC（Risk assessment code）风险评价指标体系，钢铁厂周边、冶炼厂周边、火电厂周边水稻土Cd处于超高风险水平，大宝山矿山污染的上坝村水稻土、乐昌铅锌矿周边水稻土和中山水稻土（三角洲沉积土）处于高度风险水平。全量Cd是影响各形态Cd最主要的因素，pH、黏粒、活性Mn也能影响不同形态Cd分配，但残渣态Cd含量不受土壤性质影响。 |
| 英文摘要: |
| The environmental problems of Cd contaminated soils are of great concern all over the world. Cadmium toxicity in soil is not only related with total concentration, but also depends on its chemical forms. Six different contaminated paddy soils in Guangdong Province, Southern China, were collected. Cadmium chemical fractions were determined by the BCR protocol, and stepwise regression method was employed to characterize the relationship between cadmium fractions and soil properties. Results showed that total Cd content in six paddy soils was higher than the Class II of the soil environmental quality standards. Cadmium concentrations in soils around smelter were the highest, followed by soils around steel plant, thermal power plant, and lead-zinc mine in Shangba village and Zhongshan. Soil Cd was dominated by acid extractable fraction. Risk assessment code(RAC) indicated that Cd was at very high risk level in soils around steel plant, smelter and thermal power plant, and high risk level in soils around lead-zinc mine, Shangba village and Zhongshan. The total Cd concentration was the dominant factor affecting Cd chemical fractions. Soil pH, clay content, and MnAAO content also affected soil Cd fractions to some extent. Residual Cd fraction was not correlated with soil properties. |
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