关键词: 小型兽类, 密度分布, 害兽防治

Abstract: The survelifance data of fixed seat trap in threeplots from 1987 to 1990 has beenanalysed .It indicated that the density distribution of small mammals in the farmland of western Sichuan varied greatly with the distance to the farmhousei．e．thecloser to the farmhouse, the highest density of small mammals existed .The density decreased clearly with the distance away from the farmhouse. The distribution curve was alogistic curve. The house rodents were more concentrated to the housethan field rodents and Sichuan short tail shrew. In the mean while,the density distribution varied with seasons, therewere higher density in the distance between 50 meter to 75 meters from the farmhouse in spring and summer.In autumn and winter. the closer to the farmhouse,the higher density of small mammals presented.

Key words: Small mammals, Densily distribution, Pest contro