围栏及灭鼠后布氏田鼠种群动态的初步研究

A PRELIMINARY STUDY ON POPULATION DYNAMIC OF BRANDT'S VOLE AFTER FENCE AND RODENT CONTROL

在内蒙古典型草原上采取人工围栏保护草场和灭鼠的措施后,对当地优势鼠种布氏田鼠数量产生的影响是:春季灭鼠使鼠密度明显下降,到秋季回升为春季的9/10,未灭鼠区秋季鼠密度是春季的10倍;灭鼠后种群性比发生变化,5月和6月雄鼠显著多于雌鼠,雌鼠怀孕率和雄鼠睾丸下降率均增高,但胚胎数无明显变化。围栏后对布氏田鼠种群密度、年龄组成和雌、雄性繁殖都无明显影响。

This paper deals with the population characteristics of brandt's vole(Microtus brandti)after fence and rodent control, it was carried out in the typical steppe in ZhengXiang Bai Banner, Inner Mongolia from April to September in 1987. Brandt's vote distributed in the steppe of Inner Mongolia,it is an important component of the rodent community in the typical steppe region. Density of the population that reduced evidently in the autumn after rodent control was 90% of that in spring,but without the control region the density of the population that was increased evidently in autumn was higher than that in spring. After rodent control decreased scrotal sac rate of male and pregnancy rate of female was increased, but the average embryo number does not change. There are not an effect on the density,the age composition and the reproduction of the population after fence.