果洛地区高原鼠兔繁殖特性种群数量和对天然草地的危害

Reproduction Traits and Population Amount of Plateau Pika in Guoluo Region

在果洛州3县5个样点2000—2004年的实验和调查结果表明:果洛地区鼠害区高原鼠兔5年的平均密度达908只/hm2,属极严重的鼠害区;高原鼠兔的性别比并非1∶1,5年的性别比平均为1.25∶1,高原鼠兔每年只怀孕一次,在5年的调查研究中没发现高原鼠兔有第二次的怀胎情况。

Experiments and investigation had been conducted in three counties and five sites of Guoluo prefecture for five years. The results showed that population density of plateau pika was 908 Ind/hm^2 in grassland damaged by plateau pika in Guoluo region. The ratio of female to male was not 1 ： 1 , and the average value of the sex ratio was 1.25 ： 1 for five years. In addition,plateau pika reproduced once every year in Guoluo region.