大豆主要食叶害虫生态位的研究

Ecological Niches of the Main Defoliator Pests in Soybean Fields

本文研究了大豆田５种主要食叶害虫的生态位。在时间方面：生态位宽度指数以大豆小夜蛾最高（０．６０１５）；生态位重叠指数以大豆小夜蛾对银纹夜蛾最高（０．１０８１）；生态位相似性比例指数以大豆小夜蛾对豆天蛾最高（０．７７１６）。在空间方面：生态位宽度指数以棉铃虫最高（０．９９０４）；生态位重叠指数以棉铃虫对大豆小夜蛾最高（０．１２３３）；生态位相似性比例指数以棉铃虫对大豆小夜蛾最高（０．８８７０）。

The ecological niches of five defoliators in soybean fields were studied In time aspect: the niche breadth index of Ilattia. octo (0 601 5) and the niche overlap index of I. octo to Plusia agnata (0 108 0) and the niche simitarity index of I. octo to Clanis billineate (0 771 6) were the highest among the dofoliators, respeetively In space aspect: the niche breadth index of Helicoverpa armigera (0 990 4) and the niche overlap index of H. armigera to Ilatta octo (0 123 3) and the niche simitarityindex of H. armigera to I. octo (0 887 0) were the highest among them, respectively The quantitative characteristics of the occurrence of each defoliator population were analysed by the theory of ecological niche