The niche breadths of natural enemies of the wheat aphids in wheat, barley and oat fields in Tacheng and Ili, Xinjiang Uygur Autonomous Region were estimated on the basis of investigation in 1990.

• 利用生态位理论，对新疆塔城、伊犁两地区麦田麦蚜主要天敌类群瓢虫类、食蚜蝇类、斑腹蝇类、蚜茧蜂类和蚜小蜂类的生态位宽度和重叠度进行了计算和分析。