• 关键词：生物炭  重金属  土壤污染  Pb  Cd

• 基金项目：国家高技术研究发展计划(No.2012AA101402);国家科技支撑计划(No.2015BAD05B02)

• 高瑞丽
• 华中农业大学资源与环境学院, 农业部长江中下游耕地保育重点实验室, 武汉 430070

• 朱俊
• 华中农业大学资源与环境学院, 农业部长江中下游耕地保育重点实验室, 武汉 430070

• 汤帆
• 华中农业大学资源与环境学院, 农业部长江中下游耕地保育重点实验室, 武汉 430070

• 胡红青
• 华中农业大学资源与环境学院, 农业部长江中下游耕地保育重点实验室, 武汉 430070

• 付庆灵
• 华中农业大学资源与环境学院, 农业部长江中下游耕地保育重点实验室, 武汉 430070

• 万田英
• 华中农业大学资源与环境学院, 农业部长江中下游耕地保育重点实验室, 武汉 430070

• 摘要：用生物炭修复重金属污染土壤已有广泛研究.本文采用水稻秸秆在500℃下制成的生物炭,施入Pb、Cd复合污染的土壤中培养30 d,探讨重金属化学形态变化,以期为生物炭修复重金属污染土壤提供科学依据.结果表明:生物炭添加后,黄棕壤的pH升高,弱酸提取态、可还原态及可氧化态Pb含量降低,残渣态Pb含量极显著增加,土壤Pb活性降低;与未加生物炭处理相比,添加生物炭后高浓度Cd污染土壤中弱酸提取态Cd含量极显著降低,可氧化态Cd含量增加,而残渣态Cd含量变化不显著,表明添加生物炭可以促进弱酸提取态Cd向可氧化态Cd转化.Pb、Cd复合污染土壤中Pb-Cd交互作用极显著,添加生物炭减弱了交互作用对弱酸提取态Pb的影响.

• Abstract：Biochar has been widely studied for remediation of heavy metal polluted soil. In this study, biochar made from rice straw under 500℃ was added to Pb-Cd contaminated soil for 30 days, and then fractionations of heavy metals in soils were measured. Results showed that after adding biochar, the pH value of the yellow brown soil rose, and the contents of weak acid extractable, reducible and oxidizable Pb reduced, while the residual fraction Pb significantly increased. The weak acid extractable Cd decreased significantly in high level Cd soils in comparison to no biochar treatment, whereas the content of oxidizable Cd increased and the residual fraction Cd had no significant changes. These indicated that the application of biochar may transfer the weak acid extractable Cd to oxidizable Cd, and decrease their potential risk in soils. There was significant interaction between Pb and Cd in Pb-Cd contaminated soils, and the biochar application weakened the interaction impact on the content of the weak acid extractable Pb.

• Key words：biochar  heavy metal  soil contamination  Pb  Cd

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