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

摘要： 1985年4月至1992年12月，作者采用夹夜法对萧山围垦农区小型兽类的种群动态进行了连续逐月定点定时的研究。种群的季节消长规律呈前峰型曲线的种群有黑线姬鼠、小家鼠和褐家鼠(室内)，呈后峰型曲线的种群有臭鼬和褐家鼠(室外)。黑线姬鼠季节消长规律与农区作物类型、小兽群落组成、冬季死亡率和怀孕率等因素有关，并受环境因子的影响。

关键词: 围垦农区, 小型兽类, 种群动态