Abstract: The bug communities in a secondary forest having cultivated Kerria yunannensis for five years (plot Ⅰ), and in the plantations having cultivated K. yunannensis for three years (plot Ⅱ), one year (plot Ⅲ), and zero year (plot Ⅳ) in Lüchun County of Yunnan Province were investigated by sweep netting method. A total of 423 specimens were collected, representing 47 species in 7 families of Heteroptera. The species composition and diversity of the bug communities differed with the plots. In plot I, the species richness was higher, while the diversity was moderate because of the more Cletomorpha insignis individuals. Among the plantations, plot Ⅳ was richest in species, lowest in dominance, and highest in evenness and diversity, followed by plot Ⅲ, and plot Ⅱ. With the increasing year of K. yunannensis cultivation, the species richness and diversity of bug communities tended to decrease because of their competition with lac insects.

Key words: Atrazine, Biodegradation, Soil microorganisms, Community structure, ARDRA