中文摘要：

对豆荚螟寄生蜂——黑胸茧蜂Bracon nigrorufum Cushman与豆荚螟Etiella zinchenella Treitschke在空间分布、生态位、豆荚螟密度与寄生率的关系等寄生适应性进行研究。结果表明，黑胸茧蜂与豆荚螟不但在柠条林间的分布型十分吻合，且在单株柠条植株上的分布也相似；在树冠上、中、下3层中，均以上部聚集度最大、密度最高；在树冠东、南、西、北4个方位中，均以南方聚集度最大、密度最高。树冠上层黑胸茧蜂的寄生率高于中、下层，东面寄生率高于其他3个方位；豆荚螟密度与黑胸茧蜂寄生率为非线性的负相关关系。二者生态位宽度、重叠度和种间竞争系数较大，说明黑胸茧蜂对豆荚螟有较强的追随关系，控制力较强。

英文摘要：

The parasitoid fitness, including spatial distribution, niche overlap, the parasitoid rate of Bracon nigrorufum Cushman and its response on population density of Etiella zinckenella Treitsehke, was studied. The results showed that the distribution pattern of B. nigrorufum and E. zirwkertella were similar not only in the woodland, but also in single tree of Caragana. Their aggregate levels and densities were highest in the top and south direction of the tree. The parasitoid rates of B. nigrorufum were higher in the top and the east direction. Negative nonlinear relationship showed in the rate of parasitism of B. nigrorufum and density of E. zinchenella. The parameters, such as niche width, niche overlap and coefficient of interspecific competition, were higher, which indicated that B. nigrorufum had strong ability to control E. zinchertella.