The research aimed to evaluate the environmental quality of heavy metal Cu in the surface soil of the farmland and stream sediment in wastewater irrigation area in southern suburbs of Baotou(SSWB). Samples were collected using linear,profile-based and quincunx methods to determine the content of Cu in stream sediment and agricultural soil in different locations and regions. The effect of Cu on the ecological environment was analyzed,and the soil environmental quality in the research area was evaluated. The results showed that the highest content of Cu in stream sediment was 38. 48 mg/kg. In agricultural soil, the highest content and the average content of Cu were 26. 96 mg/kg and 19. 03 mg/kg. The maximum monomial pollution index(Pz) was 0. 27, lower than 0. 7,and the composite index (Ei) of potential ecological risk was 49. 59, lower than 90. These indicated that the environmental quality of Cu in the SSWB was lower than pollution levels and the potential ecological risk degree was mild. Cu was accumulated in the SSWB due to human activities, which should be paid attention to.%为了评价包头市南郊污水灌溉区农田表层土壤、水系沉积物Cu环境质量,按照线型、剖面型和梅花型取样,测定不同研究点、区水系沉积物和土壤重金属Cu含量,分析重金属Cu对生态环境的影响,并对研究区土壤环境质量进行评价.结果显示,研究区水系沉积物Cu含量最大值为38.48 mg/kg,其中污灌区农田土壤Cu含量最大值为26.96 mg/kg,农田土壤Cu含量平均值为19.03 mg/kg;污灌区农田土壤Cu的单项污染指数最大值为0.27,污染指数Pi＜0.7；潜在生态风险综合指数Ei为49.59,即Ei＜90.说明污灌农田土壤质量状况尚未达到污染级别且潜在生态风险程度属于轻度.但人类活动已经导致Cu在污灌区土壤、水系沉积物等生态环境中的明显积累,应该引起重视.
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