【作者】 韩卉； 杨玉宝； 李季； 罗维；

【Author】 Hui HAN 1 , Yubao YANG 1 , Ji LI 1 , Wei LUO 2 1 College of Resources and Environmental Science,China Agricultural University,Beijing,China,100193 2 Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences,Beijing,China,100193

【机构】 中国农业大学资源环境学院； 中国科学院生态环境研究中心；

【摘要】 本文通过研究污泥不同农用方式下土壤中重金属总量累积情况,评价重金属的污染风险;另外,通过提取土壤中重金属不同形态,探索不同污泥农用方式下重金属在土壤中的形态分布规律,为污泥农用安全性提供理论依据。结果表明:随着种植年限的增加,污泥农用显著增加了耕层土壤(0-20cm)中重金属Cu、Zn、Pb、Cd总量,20-40cm土层中重金属总量增加不明显;作物不同生育期,各处理土壤重金属形态分布无明显变化,各处理不同重金属均主要以残渣态存在,Cu、Zn、Pb、Cd4种重金属中,Cd元素弱酸提取态含量最高。更多还原

【Abstract】 This paper studied the accumulation and the pollution risks of heavy metals in farmland soil after the amendment with sewage sludge. Furtherly the soils were extracted to determine the different chemical speciation of heavy metals and to reveal the distribution of them in the soil profiles, which could be used for the safe application of sewage sludge in agriculture. The results showed:Along with the years of planting, total Cu、Zn、Pb and Cd had increased a little in soil upper layer(0-20 cm), but no more changes were found in the soil layer of 20-40 cm. There were no significant changes of the distribution of different chemical speciation of heavy metals in soil under different fertilization in all growth periods. Residual speciation was main speciation for all four heavy metals, and dilute extraction state of Cd was higher.更多还原