关键词: 布氏田鼠, 种群趋势, 预测指标

Abstract: The seasonal population fluctuation of Microtus brandti is one peak and population fluctuation among years has no periodity. By analysising the reproduction and life history characteristics and population structure, we suggest five useful indexes which could predict the trendency of population dynamics. These indexes are as follows: the pregnant rate of overwintering voles in Late April, the mean net body masses(or body mass excluding abdominal viscera)of Overwintering voles in Late April: the mean litter size of overwintering voles in Spring(April—May), the ratio of voles born of this year to population in Late May: the time of pregnancy of voles born of this year. Some discussions on mechanism of popalation fluctuation of Microtus brandti have been given.