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１９７５－１９９０年，在黑龙江省镜泊湖林区以夹日捕获率作为数量指标，调查了各类生境及不同季节和年份棕背鼠平Ｃｌｅｔｈｒｉｏｎｏｍｙｓｒｕｆｏｃａｎｕｓ的数量，并结合已有的报道探讨了长白山地林区棕背鼠平种群数量分布以及数量变动规律。结果表明，棕背鼠平的数量具有明显的垂直地带性分布，在阔叶林带数量很少，为稀有种，在针阔混交林带数量较多，为优势种，到针叶林带数量最多，并为绝对优势种。数量的季节性变化明显，春季数量最低，在原始针阔混交林中７月份达到全年数量高峰，在人工落叶松林中，９月份才达到数量高峰。年间数量变动很大，从１９７５年至１９９０年的１６年间，曾出现过５次数量高峰年，表现出３年或４年出现一次数量高峰年的周期性变动规律
From 1975 to 1990, the catch rate of Pinus massoniana in Heilongjiang Province was used as the quantitative index to investigate the quantity of Clethrionomysrufocanus in various habitats and brownbacks in different seasons and years. Based on the existing reports, Population Distribution and Quantity Variation of Brownback Rat Population in Forest Areas. The results showed that there were obvious vertical zonal distributions in the flat number of brownback rats. The number of broadleaf forest was rare and rare species. The number of coniferous and broad-leaved mixed forest belonged to more dominant species and the highest to coniferous forest belts For the absolute dominant species. Seasonal changes in the number of obvious, the lowest number in spring, the original coniferous and broad-leaved mixed forest in July reached the peak annual volume, in the artificial larch forest, reached its peak in September. The number of years varies greatly. During the 16 years from 1975 to 1990, there have been 5 number of peak years showing a cyclical pattern of changes in the number of peak years in 3 or 4 years