鄂尔多斯沙地草场小毛足鼠种群数量动态及预测

目的：研究鄂尔多斯沙地草场小毛足鼠种群数量动态，并对其种群数量进行预测。方法：１９９１～１９９６年每年４～１０月的每月中旬在沙地草场的６种生境内，采用直线夹日法调查，以捕获率（％）表示种群密度，并利用捕获率和繁殖指数为指标建立预测模型。结果：６年中该鼠平均季节消长曲线呈单峰型，７月为最高峰，４月为最低峰，相差最多的１９９３年，最高峰是最低峰的１０．５倍。６年中该鼠数量年度变化经历了低谷－高峰－下降

Population Dynamics and Prediction on Phodopus roborovskii in Ordos Sandland

Population dynamics of Phodopus roborovskii was investigated on ordos sandland by rectilinear trapping method in the middle ten days of April to October during 1991-1996. A total efforts of 124 245 trapping days was made and 7 498 rodents were captured in which 2 411 specimens were Phodopus roborovskii . Seasonal fluctuations of its population numbers were significant and existed significant difference among years. In general,there was only one peak and one valley which occurred in July and in May respectively in a year. The population dynamics among years has undergone a complete cyclical fluctuations consisting of 4 phases. The 4 phases were valley,increase,peak and decrease which occurred in 1991-1992,1992-1993,1993 and 1994 respectively. Another period started again from 1995,which was the valley phase. Prediction models were established with the index of capture rate for short term models,reproduction index for middle and long term models.