关键词: 典型草原, 种群数量, 鼠害控制

Abstract: The studies were carried out on Zhengxiangbai County steppe of Inner Mongoliaduring 1987- 1996.There are seven species of rodents on the grassland.The dominant species isbrandt's vole (Microtus brandti) which is a kind of social rodent and its population dynamics has awide amplitude.Its population density reached the highest level (mean capture rate was 55%) in1987,but decreased rapidly in 1988 and 1989.The capture rate of 1987 was 36.6 times as much asthat of 1989.The brandt's vole population number underwent a cycle of "steady-increase-peakdecrease- steady" during the ten years.Its damage to pasture taked place on the stages of"increase","peak" and the first year of "decrease".On the contrary,the other rodent species had anarrow amplitude of population number and have never damaged the pasture during the ten years.According to the rodent community composition and populaton dynamics,sustained control measures of rodent pests was putforward in this paper.