Structure and Seasonal Dynamics of Arthropods in Transgenic Bt Cotton Field
转Bt基因棉田节肢动物群落营养层及优势功能团的组成与变化

To understand the ecological impacts of the transgenic Bt (CryI(c)) cotton on natural enemies of the target pest, Helicoverpa armigera (Hübner), and non-target arthropods in cotton fields, a systematic survey was made in a transgenic (Bt) and a conventional cotton field in Nanpi county, Hebei Province in 1997. Both plots were about 0.3 hm 2. All arthropod species and their numbers were recorded by visual observation on 100 plants in 10 standard sampling spots between May and October at five-day intervals. ...