关键词: 黑线毛足鼠, 种群数量, 种群年龄组成, 繁殖

Abstract: This paper presents results of studies on the population quantity，composition and reproduction of striped hairy-footed hamster(Phodopus sungorus)，itwas carried out in the typical steppe in Zheng xiang bat County，Inner Mongolia from April to September 1987．A total number of 231 specimens were colleted and dissected，among which 108 were females and 123 males．Results obtained are as follows．
1．There is a small number of striped hairy-footed hamster distributed in the steppe in Inner Mongolia．After rodent control，the population density of striped hairy-footed hamster increases more than brandt's vole (Microtus brandti) ，while the population density of Brandt's vole was low．
2．The specimens were divided into four age groups based on the height of grinding surfaces of the posterior molar and first upper molar wear of stripe d hairy-footed hamster．Four age groups are juvenil,subadult，adult and senior respectively．
3．The Sex ratio of striped hairy-footed hamster was 1:1 approximately．
4．the breeding characteristic of the male was studied according to the weight and length of testis and the sex maturity．The spermatozoa were determined as landmark of Sex maturity．
5．The pregnant rate in female averaged out to 43.10±9.20％ ，and it was 36.40± 27.67% in May，75.00±14.20％ in June，51.90±16.70% in July and 52.40±19.20% in August．The average 1itter size was 6.81±0.22，and 7.75± 1.03, 7.41± 0.54，6.81±0.26 and 6.36±0.39 from May to August respectively．

Key words: Striped hairy-footed hamster, Population quantity, Populaion age composition, Reproduction