【摘要】 <正> 棕背(鼠平)(Clethrionomys rufocanus)是东北林区的优势鼠种,由于啃食树皮危害林木生长,在数量大发生年的秋末冬初更加严重,因此了解林地棕背(鼠平)数量变化规律,以便更有效地防治幼林鼠害,是很有意义的工作。棕背(鼠平)数量变化不仅与林分郁闭度有关(舒凤梅,1981),而且与林地坡度也有关。本文着重探讨不同坡度林地的棕背(鼠平)数量更多还原

【Abstract】 The vole (Clethrionomys rufocanws), is a dominant species in Heilung-jiang forest region. It gnaws bark in winter and does harm to the artificial young forest. Investigations show that the degree of harm depeuds on the nmber of voles in habitats of different slopes which may be divided into 4 types, ( 1) sedgy steep slope, with a gradiant of 25 (2) gentle slope with weeds with a gradiant of about 10? (3) level land about 5? (4) low-lying land. There are more voles in the level land than on the steep slope.In aforestation we should select lands with suitable slopes to plant trees which should also be selected the ones not palatable to the voles. It is better to know the number of the voles on different slopes at the end of autumn, in order to predict the spots of possible damage occurence and to take controlling measures.更多还原