内蒙古土默特平原西部长爪沙鼠种群数量动态调查

1981～1985年,连续5年在大青山与黄河之间的土默特平原西部对长爪沙鼠(Meriones un-guiculatus)的种群数量动态做了调查。结果表明,5年中以1982年的密度为最高(39.96只/ha.),以1985年为最低(24.12只/ha.)。参考既往资料可见,在自然状况下,该鼠数量年际变化的特点是,由低逐年增高,达到一定高峰时便逐年下降;当下降到一定水平时,又会自然逐年回升。其季节数量变化为,一年内有两个高峰(2、3月份与9、10月份),和两个低谷(7、8月份与12、1月份)。在人工大规模灭鼠后,使其密度下降到95％左右时,经过8个月左右,该鼠即可恢复其原有密度。该鼠是一种对自然条件适应能力较强的种群,一般的自然气候变化,对其种群数量的年际变化,无明显的影响。

DYNAMIC SURVEYS ON THE QUANTITY OF MERIONES UNGUICULATUS IN WESTERN TUMOTE PLAIN, INNER MONGOLIA

Dynamic surveys successively carried out from 1981 to 1985 on the quantity of Meriones unguiculatus in western Tumote Plain between Mount Daqing and the Yellow River showed that, in the 5 years, density of the rodent was the highest in 1982(39.96/ha.)and the lowest in 1985(24.12/ha .).With the past data taken into consideration, it was indicated that under natural conditions, the rodent increased in number gradually to a Peak, than decreased to a cemin level and increased again. As for the annual changes, there were 2 peaks (Feb. to Mar. and Sempt. to Oct.)and 2 valleys (July to August and Dec. to Jan.) .In 8 months after artificial mass rodent control that decreased the density to its 95%, the rodent obtained its former density again. This species of rodent had a strong adaptability to circumstances, ordinary changes in climate had little affection on its population quantity.