Abstract: The population dynamics of the gerbil, Meriortes unguiculatus Milne- Edwards was studied in the years 1964-69, at Siziwangqi,Inner Mongolia, where the agriculture has a representative characteristics in the region North to Yin Mountains.A strip area of 7-9 Km. in length was investigated annually in April, June and September and more than 1800 gerbils were captured. Their reproductive status and measurements were recorded, and their skulls were preserved for further studies.From the biological points of view, in studying the population dynamics of the gerbil, we have recognized the following 4 points:1) There were larger variations in age structure, body length, body weight etc. of the populations in different years.2) The percentage of the males with enlared seminal vesicle in the same season of different years had an inverse relation with the population densities.3)There was a positive correlation between the reproductive indices of the females and the density increments of next year. Besides, a positive correlation also existed between the spring reproductive indices and the summer density increments in multiples.4) Reproductive phenomenon existed in winter, but it changed greatly in different years. A non-reproductive period existed in August-September.The environmental factors influencing the population such as the climates and agricultural measures were also considered.

摘要： 内蒙古自治区阴山以北,通称后山地区,是重要的粮产区之一,但农业鼠害严重。如四子王旗,1961年受鼠害面积达54万6千余亩,严重减产者达25％以上。为害鼠种有长爪沙鼠(Meriones unguiculatus Milne-Edwards)和黄鼠(Citellus dauricusmongolicus Milne-Edwards),其中以长爪沙鼠为害严重。 长爪沙鼠是一种数量变幅大的群居鼠类。有关长爪沙鼠生态学及其对农业的危害,曾有过一些报道(夏武平、王文滨1956;何平均、丁建兴1957;赵肯堂1960),但系统地研究其种群动态的,尚不多见。 1964年至1969年,我们以内蒙四子王旗农区为工作点,较长期地研究了长爪沙鼠的种群动态和数量变动的调节。本文着重论述与种群变动有关的几个因素。