关键词: 子午沙鼠, 种群密度, 繁殖, 食性, 年龄结构

Abstract: This paper deals with some ecological information of Meriones meridianus at Linhe district in Lingwu county. This investigation was carried out monthly during 1984-1985. There are 3 main habitats at this district: Ⅰ, Plain semi-desert grassland;Ⅱ, Lowhills with semi-desert grassland;Ⅲ, Small wasteland between agricultural fields; the investigation area is 270 hectares, the average densities of M. meridianus in the 3 habitats are 0.96/h., 0.59/h., 1.50/h. respectively.Dissected 1455 females and 1368 males, the total sex ratio ( ♀:♂ ) is 1:0.94. There are pregnancy females in all year except in winter (Nov.-Jan.), the pregnancy rates and reproductive indices are higher in May-Sep., highest in July. Almost all testes of adults falling in scrota from April to August.Dissecte 1411 stomaches of M. meridianus, the main food is leaves and stalks in summer, is seeds in other seasons.The ecological life-span is short, about one year. Population age structure is pyramid in shape in summer and autumn, the rate of subadults in population is highest.

Key words: Meriones meridianus, Population density, Reproduction, Food habits, Age structure