根田鼠对不同类型栖息地的利用

为研究根田鼠(Microtus oeconomus)对不同类型栖息地的利用强度，于2002-2003年的7-9月在中国科学院海北高寒草甸生态系统定位站地区采用样方法测定了4种类型栖息地(人工耕作地、真草甸、沼泽化草甸、金露梅灌丛)中的3个根田鼠活动强度变量(跑道长度、跑道分叉数、洞口数)。除了跑道长度和跑道分叉数在真草甸和沼泽化草甸问差异不显著外，3活动强度变量在不同类型栖息地间均差异显著，而且变化趋势一致；根田鼠对4类栖息地的利用强度从大到小依次为金露梅灌丛、沼泽化草甸、真草甸、人工耕作地。整体上根田鼠表现为偏好利用食物资源丰富、没有竞争性啮齿类栖息、较为郁闭的栖息地。

Utilization of Root Vole (Microtus oeconomus) on Different Types of Habitats

Habitat utilization of root vole (Microtus oeconomus) was studied in the region of Haibei Alpine Meadow Ecosystem Research Station,the Chinese Academy of Sciences,from July to September of 2002 and 2003.Three indexes of activity intensities,runway length,runway branch number and burrow entrance number were used to estimate root vole s utilization intensities on four types of habitats,manual cultivated land,true meadow,swamp meadow and Dasiphora fruticosa shrub.It was same that three indexes of activity intensities trended in four types of habitats.The activity intensities of root vole on four types of habitats were in ascending order of the manual cultivated land,true meadow,swamp meadow and D.fruticosa shrub.Three indexes of activity intensities were different significantly between each two types of habitats,except the runway length and runway branch number between the true meadow and swamp meadow.Overall,the root vole preferred the dense microhabitat with abundant food resource and no existence of competitive rodents.