Abstract: Community structure of ground-dwelling beetles (Coleop tera) was investigated in land different in use in the wetland region of the Sanjiang Plain. Beetles were collected in pop lar forest, pine forest, birch2xylosma forest, soybean field, ridge and ditch in soybean field during the period from June to Sep tember 2007, using pitfall traps. A total of 1 646 beetleswere caught, and classified into 25 families. Dominant in the collection were Carabidae ( 52.9% ) , Staphylinidae(20.1% ) and Elateridae (10.8% ). Analysis of the collection was carried out for species abundance, diversity index and richness index of the beetles community in the six types of land. Results show that soybean field was the highest in number of beetles collected, while p ine forest the lowest; birch-xylosma forest the highest in species abundance, while poplar forest the lowest; soybean field ridge the highest in diversity indexwhile poplar forest the lowest, ridge the highest in Pielou index while ditch the lowest, suggesting that land use significantly affects Carabidae abundance and Shannon-Wiener index, but little does Pielou evenness index, while seasonal variation does not affectmuch number of the beetles, but does significantly affect both Shannon′s diversity and Pielou′s evenness.

Key words: ground-dwelling beetle, land use, diversity, wetland, Sanjiang Plain