Study on grassland rodent pest division in Gansu province

Gansu grassland rodent flora were composed of 68 species, which accounted for 75.6% of total rodent in Gansu, population density of most species was under economic loss level, and play an important role in grassland ecology system. As many as 1826 species could cause economic loss, and dominated in different types of grassland. The grassland rodent pest division should follow history development, ecological adaptability and production practice. Thereby, the grassland rodent pests of Gansu province were compartmentalized to five regions according to indicators of grassland rodent faunal component, zonal biology climate, zonal vegetation, and thirteen subregions according to indicators of preponderant zonal grassland type, representative rodent distribution and dominant rodent species.