中文摘要：

以北京郊区典型的设施菜地为研究对象,研究了土壤中Cd、Cr、Cu、Zn、Pb和As 6种重金属的含量和剖面分布特征。结果表明：除As外,Cd、Cr、Cu、Zn和Pb含量随着土壤垂直剖面（0～100 cm）的加深而明显下降,表层土壤中（0～20 cm）Cd、Cr、Zn、Cu和Pb的含量,设施菜地比对照（露天菜地）分别提高了21.8%、11.3%、29.4%、27.6%和5.8%,而As的含量变化不大;在土壤80～100 cm的剖面中,Cd、Cr、Cu、Zn、Pb和As 6种重金属的含量比对照分别增加了12.5%、6.7%、1.4%、1.5%、17.3%和1.3%。此外,随着种植年限的增加,表层土壤中的Zn、Cr、Cd、Cu和Pb的含量也显著增加,其积累速率分别为4.584、0.933 8、0.013 3、1.243 mg·kg^-1·a^-1和0.641 7 mg·kg^-1·a^-1。6种重金属含量与土壤中的有机质、全氮含量都呈显著的正相关关系,Zn、Cr、Cd、Cu和Pb含量与全磷含量也表现出显著的正相关关系;因此有机肥、化肥的施用可能是设施菜地土壤中重金属含量升高的重要原因。

英文摘要：

The vertical distribution of cadmium （Cd）, chromium （Cr）, copper （Cu）, zinc （Zn）, arsenic （As） and lead （Pb） in the soils of the facility vegetable fields from Beijing suburbs were studied. With increasing depth in the soil profile （0～100 cm）, the concentrations of heavy metals decreased, except As. By comparison with those of the control （open vegetable fields ）, the concentrations of Cd, Cr, Cu, Zn and Pb in the soil profile （0-20 cm） of the facility vegetable fields increased 21.8%, 11.3%, 29.4%, 27.6% and 5.8%, respectively, but Cd, Cr, Cu, Zn, Pb and As concentrations in the soil profile （80-100 cm） increased by 12.5% ,6.7%, 1.4%, 1.5%, 17.3% and 1.3%, respectively. Besides, the contents of Zn, Cr, Cd, Cu and Pb in the soil profile （0～20 cm） of facility vegetable fields, had significant positive correlations with planting years, with the accumulation rates of Cd, Cr, Zn, Cu and Pb being 4.584, 0.933 8, 0.013 3, 1.243, 0.641 7 mg·kg^-1· a^-1, respectively. Meanwhile, the test six heavy metals contents were significantly positively correlated with the contents of soil organic matter and total nitrogen, and the Zn, Cr, Cd, Cu and Pb contents were significantly correlated with the content of soil total phosphorus, applying organic fertilizer and chemical fertilizer could induce the heavy metals accumulation in the soils of facility vegetable fields to some extent.