Abstract: By the method of net-capture, the community composition and structure of understory bird in evergreen broadleaved forest in Chebaling of Guangdong Province were studied from November 2006 to April 2007. A total of 309 individuals belonging to 23 species, 10 families and 3 orders were captured during 1 781.3 net-hours. Passeriformes was the main component, and Grey-cheeked Fulvetta (Alcippe morrisonia) and Grey Treepie (Dendrocitta formosae) were the dominant species. From the viewpoint of feeding habits, insectivorous birds were the main, with 143 individuals and 13 species captured, accounting for 46.3% and 56.5% of the total, respectively. Babblers possessed a high proportion in the understory bird community.

Key words: Cucumber powdery mildew, Silicon, Enzyme activity, AsA, GSH