Abstract: By using pitfall trap, the Carabidae communities in six different land use types including poplar forest, pine forest, birchoak forest, soybean field, and soybean field ridge and ditch in  Sanjiang Plain were investigated from June to September 2007. A total of 871 Carabidaes belonging to 34 species were collected, of which, Chlaenius pallipes, Synuchus orbicollis and Chlaneius tristis  were the dominant groups, accounting for 19.4%, 19.3%, and 13.2%, respectively. The richness index was the highest in poplar forest and the lowest in birchoak forest, while the ShannonWiener index and Pielou index were the highest in soybean farmland and the lowest in poplar forest. Variance analysis showed that land use type and sampling time had significant effects on Carabidae abundance, which was the highest in poplar forest and the lowest in pine forest (F=2.987, P<0.05), and the highest in September and the lowest in July (F=8.172, P<0.05), but had no significant effects on the richness, diversity, and evenness of Carabidae.

Key words: Cotton, Helicoverpa armigera, Parasitic wasp, Behavioral responses