关键词: 黄羊, 种群结构, 动态

Abstract: The Study on randomly sampled 1026 Mongolian gazelle(Procapra gutturosa)from Western Banner，Hulun-Beier grassland，in December 1988 has been done.
The population in 1988 could be classified into 8 age groups，the proportion of new born animals is high(39．7 %)，reproductive female is 24．95%，above 4.5 year-old groups is 12.7% ，it is a typical rapidly increasing are structure.Comparing with 1：1 there are significant difference in the sex ratio(♂♂ /♀♀)of the total population,2. 5, 3.5 and over 5.5 year-old age groups，the result is very differ from that in 1979．According to the life table and death rate curve there are three mortality peaks happened at 0.5，3.5 and over 6.5 year-old age groups．The net reproductive rate(R₀)of the population in 1979 and 1988 are 1.1335 and 0．864 respectively．There is a trend of sex-maturity age in 1988 ealier than that in 1979．
The population size decreased obviously and distribution area shrinked quickly during past 30 years．With high reproductive capacity and increasing age structure
，the population restoration of Mongolian gazelle is possible if the protection and management are improved．

Key words: Mongolian gazelle(Procapra gutturosa), Population structure, Dynamic trend