Abstract: In this paper,the insects and mites in two different sized saltcedar woodlands in Fukang (larger size) and Hutubi (smaller size) in the northern Xinjiang of West China were surveyed over the season.There were approximately 100 species in 50 families and 11 orders.According to the trophic level and feeding mode,seven guilds were established,i.e.,predator,parasitoid,stripfeeder,sap-sucker,gall-maker,flower-and seed feeder,and tourist.The species richness in Fukang was higher than that in Hutubi (81 to 71),with 53 species shared by both sites,but species proportion in each guild was similar at both sites.Predators,strip-feeders and sap-suckers contained more species,with each accounting for 1/5 of total species.Sapsuckers and gallmakers were most abundant,followed by strip-feeders.Most abundant species were Adiscodiapis tamariciocola (Diaspididae), Aceria tamaricis(Eriophyidae,Acarina),and Psectrocema barbatum(Cecidomyidae),whose numbers accounted for >25% of total individuals for each species,followed by Diorhabda elongata deserticola (Chrysomelidae),Coniatus steveni (Curculionidae) and Ornitholvolva heluanensis (Gelechiidae),whose numbers accounted for 5～10% of total individuals for each species.The Pielou's evenness and Shannon-Wiener diversity indices of insect communities were greater in Fukang woodland than those in Hutubi woodland during early and mid seasons,but less than those in Hutubi woodland during the later season.The Berger-Parker dominance index of insect community in Fukang was smaller than that in Hutubi.

Key words: Cd and Pb pollution, Tobacco, Root zone, Soil microbe, Quality