植物生长期布氏田鼠种群密度波动特征

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。

Population Density Fluctuation Feature of Brandt's Voles during the Growing Season of Vegetation

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.