锡林郭勒草原布氏田鼠数量的周期性和啮齿动物群落的演替

Annual Cycle of Brandt's Vole (Microtus brandti) and Succession of Rodent Community in Xilinguole Grasslands

摘要: 根据内蒙古阿巴嘎旗那仁宝力格苏木1979-1997年啮齿动物监测资料，利用变动指数(S)，得知布氏田鼠Microtus brandti)密度的年际动态具有一定的周期性。1989-1997年共捕啮齿动物10种，其中田鼠占8.45%，达乌尔鼠兔(Ochotona daurica)占5.37%。总密度(单位面积上啮齿动物的密度之和)、田鼠密度、鼠兔密度间均呈正相关(P=0.0001)，回归模型为：总密度=0.8806+1.0048(田鼠密度)+0.8779(鼠兔密度) (P=0.0001)。田鼠密度显著地影响鼠类的多样性和均匀性。1970-1997年，田鼠在鼠类群落中占绝对优势。

Abstract: The population data of rodents in Narenbaolige Sumu,Abaga Banner,Inner Mongolia during 1979-1997 showed annual cyclical fluctuations of Microtus brandti population to a certain degree by cycling index (S).There were 10 rodent species,with M.brandti (88.45%) and Ochotona daurica (5.37%) in 1989-1997.There were positive correlation relationships among the total densities (the sum of population densities of rodents in unit area),density of M.brandti and O.daurica (P=0.0001).The regression model was:the total densities=0.8806+1.0048 (density of M.brandti)+0.8779 (density of O.dauricus) (P=0.0001).The diversity and evenness of rodents were influenced significantly by the density of M.brandti.Absolute dominant species was M.brandti in rodent community during 1970-1997.