Grasshopper Community Structure on the Northern Slope of Taibai Mountain of Qinling

There were 34 species of grasshoppers that were collected from 23 samples on the northern slope of Taibai Mountain of Qinling,they belonged to 2 superfamilies ,7 families,25 genusesThe grasshopper communities were analysed using quantity classification,diversity indexes and similarity coefficients methods.Using quantity classification method,the grasshopper communities can be divided into 8 types:farmland,Quercus variabilies forest,Q.aliena var.acuteser rataforest,Liaotungensis forest,Betula  forest,Abies forest,Larix forest,and alpine meadow.The changing law of grasshopper distribution was obvious.The species and diversity indexes of grasshopper communities in high elevation mountain belt (alpine meadow) were lower than those in middle-low elevation mountain belt.The species and diversity indexes of grasshopper communitie s in middl-low elevation mountain belt (Q.aliena var.acuteserrata fo rest belt) were highest.But in farmland of low elevation mountain,for simple vegetation and human disturbance,the density and dominant indexes of grasshopper communities were higher than those in middle-low elevation mountain belt,and the species of grasshoppers were less.