Abstract: The seasonal fluctuation feature of Brandt's voles' population density during the growing season of vegetation was analyzed according to the date obtained by capture-neatly and marking-recaptured methods from 1984 to 2004.The results show as follows: 1.During the growing season of vegetation,there were significant differences of density dynamics among different years,e.g.the increase rate and autumn decline rate in high density year were 137.39% and 34.09% which were lower than the values of other years at 206.63% and 37.20%,respectively.2.For a given year,the population density in Spring was significantly correlated with the peak number of voles(r=0.643,P<0.05)and the number of winter survival voles(r=0.769,P<0.05).3.A significant correlation was detected between yearly and seasonal population density fluctuations,i.e.yearly population density was impacted by the seasonal fluctuations.The seasonal patterns usually exhibited a single-peak feature and the peak appeared during July to August.There was no distinct peak of population density but an increasing trend in high density year.

Key words: Brandt’s vole(Lasiopodomys brandtii), Population density, Seasonal fluctuation

摘要： 依据1983-2004年布氏田鼠(Lasiopodomys brandtii)捕尽法或标志重捕法调查资料。该鼠在植物生长期的种群波动特征为:不同密度年度间增长幅度差异显著,其高密度年份的增长率137.39%,低于其他密度年份206.63%,且秋季田鼠种群下降幅度34.09%,小于其他年份37.20%;布氏田鼠春季种群密度将显著影响当年高峰期(r=0.643,P<0.05)以及越冬鼠数量(r=0.769,P<0.05);年际与季节波动密切相关,高低数量年可从季节波动中反映出来。布氏田鼠季节消长曲线为单峰型,峰期在7-8月;在高密度年无明显波峰,为持续增长趋势。

关键词: 布氏田鼠, 种群密度, 季节波动