大兴安岭林区火灾后鼠类种群动态变化

DYNAMIC CHANGE OF MOUSE POPULATION IN BURNED FOREST AREA IN DAXING' ANLING

1987年5月6日大兴安岭特大森林火灾使森林生态发生了很大的变化。当然,对鼠类种群数量也有一定影响。1987年6月—1988年5月选该地区盘古二支线、沿江十二线、奋斗三支线为基本调查点,在不同坡度、坡向,坡位,分轻、中、重三个火烧等级进行调查。喜光的棕背奸已成为第一个优势种。过火的原始落叶松林鼠类数量高于未过火的;过火林的鼠类数量,依不同季节变化很大,10月份大幅度上升,10月份后又大幅度下降;未过火林内鼠类数量比较平缓。

Forest fire, occurred in Daxing′anling on 6 May 1987, make forest ecological environment change greatly. It also affected the quantity of mouse population. Three degree of fire, slight, middle, serious were investigated on different slope, aspects, position, on No. 2 branch road in Pangu, No. 12 branch road in Yanjiang, No. 3 branch road in Fendou. Light demanding dlethrionomys rufocanus is the first dominant species. Mouse in burned Larch stand is more than in unburned stand. Quantity of mouse vary greatly with seasons, it goes up seriously before October, and goes down dramatically after October, but it is stable in unburned area.