中文关键词土壤镉影响因素Cd形态生态风险评价广州南沙 英文关键词Soil cadmiuminfluencing factorsCd fractionsecological risk assessmentNansha of Guangzhou city

作者	单位	E-mail
王芳婷	中国地质大学(武汉)环境学院, 武汉 430074	ftwang1991@cug.edu.cn
包科	长江水利委员会河湖保护与建设运行安全中心, 武汉 430015
陈植华	中国地质大学(武汉)环境学院, 武汉 430074
黄长生	中国地质调查局武汉地质调查中心, 武汉 430205	cshuang@cug.edu.cn
张彩香	中国地质大学(武汉)环境学院, 武汉 430074
赵信文	中国地质调查局武汉地质调查中心, 武汉 430205
刘学浩	中国地质调查局武汉地质调查中心, 武汉 430205

中文摘要 镉（Cd）污染对人类健康构成威胁，开展Cd生物有效性研究及生态风险评价，有助于防治和减轻Cd的危害.通过分析海陆交互相土壤中的Cd含量及形态，揭示了土壤Cd的富集特征及变化规律，通过累积指数法（I_geo）、潜在生态危害指数法（E_r）和风险评估编码法（RAC），对Cd的环境生态风险进行了评价.结果表明：①杂填土中Cd含量通常低于0.3mg·kg^-1，素填土中Cd含量通常高于0.3mg·kg^-1，海相沉积物Cd平均含量为0.36mg·kg^-1，5 m以浅海相沉积物中Cd含量通常比5 m以深更高，陆相沉积物中Cd含量显著低于海相沉积物，Cd平均含量为0.10 mg·kg^-1；②人工填土层（Q₄^ml）土壤Cd与CEC存在中度相关，相关系数为0.52（P<0.05），海相沉积物Cd含量与有机质含量存在低度相关，相关系数为0.49（P<0.05），镉全量及土壤理化性质均对土壤镉的形态分布的影响显著；③人工填土层和海相沉积物土壤地质累积指数以1 < I_geo < 2为主，均属于中度污染，人工填土层和海相沉积物土壤潜在生态危害指数以80 < E_r < 160为主，存在较高潜在生态危害，各钻孔土壤酸可提取态Cd在总Cd中所占的比例均值均大于50%，普遍存在极高潜在生态风险.这些结果将为环境和农业决策提供良好的依据，为土壤污染调查和修复提供理论指导. 英文摘要 Cadmium (Cd) pollution poses a threat to human health, and research on Cd bioavailability as well as its ecological risk assessment can help prevent and mitigate Cd hazards. The enrichment characteristics and variability of Cd were investigated in sea-land interaction soil fractions and the associated environmental and ecological risks were evaluated using the accumulation index (I_geo), potential ecological hazard index (E_r), and risk assessment coding (RAC). The results showed that:① The Cd content of miscellaneous fill material was typically lower than 0.3 mg·kg^-1 and that of plain full was higher than 0.3 mg·kg^-1. The Cd content of marine sediment was significantly higher than that of continental sediments, averaging 0.36 and 0.10 mg·kg^-1, respectively. The concentration of Cd in marine sediments buried at shallow depths (<5 m) was generally higher than at greater depths (>5 m). ② There was a moderate correlation between Cd and CEC in artificial fill (Q₄^ml; correlation coefficient=0.52, P<0.05). There was a weak correlation between Cd and organic matter in the marine sediments (correlation coefficient=0.49, P<0.05). Total cadmium and the physical and chemical properties of soil had a significant influence on the fraction of soil cadmium. ③ The I_geo of artificially fill and marine sediment was dominated by the relationship 1 < I_geo < 2, which indicated a moderate level of pollution. The E_r of artificial fill and marine sediment was mainly 80 < E_r < 160, indicating a high potential ecological hazard. Soil acid-extractable Cd accounted for more than 50% of the total Cd in each drill hole, which generally indicated a very high potential ecological risk. These results provide a basis for environmental and agricultural decision-making and provide theoretical guidance for soil pollution investigations and remediation.

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