关键词: 围垦农区, 小型兽类, 种群动态

Abstract: The population dynamics of the small mammals had been studied in the reclaimed rural area of Xiaoshan,Zhejiang from Apr．1985 to Dec．1992．This paper presents the results as the following．
In the area，the seasonal patterns of variation of population density in different species were different．The population fluctuation curves showed that Apodemus agrarius，Mus musculus and Rattus norvegicus were the domestic population，of which the peak density of spring was higher than that of autumn,and the latter was higher than the former in the population of Suncus murinus and Rattusnorvegicus (field population)．
The seasonal pattern of variation in population density of A．agrarius was related to the type of crops，the composition of small mammal community ,the winter mortality and the pregnancy rate．The quantitative fluctuation of A．agrarius was influenced by the climatic factors，such as, temperature，relative humidity and precipitation．

Key words: Reclaimed rural area, Small mammals, Population dynamics