中文摘要：

在实际调查的基础上，研究了银川平原麦蚜寄生蜂群落结构组成。结果表明，银川平原麦蚜寄生蜂群落包括初寄生蜂和重寄生蜂两个亚群落，共22种，隶属4总科，7科13属。其中初寄生蜂12种，重寄生蜂10种。燕麦蚜茧蜂（AphidiusaveYlae）为优势种。并采用多样性指数（H＇）、丰富度（S）、均匀度（E）及优势度（c）等指标对麦蚜寄生蜂的群落动态进行了初步分析。结果表明：5月份前初寄生蜂的多样性指数较大，重寄生蜂的多样性则在5月中旬开始上升，总群落在6月上旬多样性指数最高。

英文摘要：

The structure of wheat aphid parasitoid and hyperparasitoid community in the Yinchuan Plains was studied. The parasitoids were collected from wheat fields, including 22 species in 7 families. There were 12 parasitoid species and 10 hyperparasitoid species. The dominant species was Aphidius avenae. The community structure and dynamics of parasitoids and hyperparasitoids were analyzed by the following indexes, namely total individual number （N）, diversity （H＇）, richness （S）, evenness （E） and dominant concentration （C）. The results showed that the diversity index of the parasitoids was higher than that of hyperparasitoids before May, but the diversity index of the hyperparasitoids increased after mid-May. The highest diversity index of the parasitoids and hyperparasitoids was observed in early June.