前言北海道造林失败原因之一是野鼠危害。据北海道地区保护协会统计,野鼠每年危害林木达1600万株,损失金额达2亿日元。红背(鼠平)鼠啃食林木的程度因树种不同而异。这暗示着各树种耐鼠性不同。因此我们对林木进行了耐鼠性的研究。先在室内以针叶树苗为饲料饲养红背(鼠平)鼠,观察鼠对各树苗取食情况,并且调查野外林木鼠害率,确定林木耐鼠性。 Foreword One of the reasons for the failure of afforestation in Hokkaido is the harm of wild rats. According to the statistics of the Hokkaido Regional Protection Association, wild shitai harms 16 million trees each year, with a loss of 200 million yen. The extent of the red back (rat) rats eating trees is different for each tree species. This implies that the species of rat are different from each other. Therefore, we conducted a study of rat resistance. First, coniferous seedlings were used as feedstuff to feed the red back (mouse flat) rats indoors, and the feeding status of each seedling was observed.