豫西黄土塬农作区棕色田鼠种群动态研究

Seasonal dynamics of mandarin vole

１９９２年４月—１９９５年４月，作者在河南灵宝程村黄土塬农作区对棕色田鼠种群数量进行了逐月调查．结果表明，其种群数量的季节变动明显，表现为春季３，４月份数量高，夏季７，８月份数量低，而秋季１０月份数量又高，然后又降低，呈典型的双峰型．这主要和鼠类的年龄结构、繁殖、气候因素及农事活动有关．在不同的季节，农田和果园的种群密度高低出现时期不同，农田内由于农作物的不同，样方密度也不同，这与食物条件有关，说明食物影响着棕色田鼠的分布．

The population numbers of mandarin vole were investigated every month from April, 1992 to April, 1995 in agriculture area on loess plateau in the west of Henan.According to statistical data,the seasonal function of mandarin vole exhibits a high low high annual pattern.The first peak occurs in spring(April),and the second in autom(October).It is related to agriculture activities,reproduction of mandarin vole, food factor, climate factors closely. Population densities are different in different seasons in farmlands and orchards. Populations densities are different because of different crops in farmlands.It shows that distributions of mandarin vole's populations are affected by food.