中文摘要：

本文报道了PVC防护套对鼠类危害内蒙古退耕还林区幼龄林的防护作用,目的在于检验其是否能用于治理退耕还林区鼠类对林木的危害。2004年9月至2005年4月,在内蒙古自治区巴彦淖尔市杭锦后旗的退耕还林区进行防护实验,逐月调查危害情况。结果表明,本地区鼠类的危害期主要为9月至11月,累计危害率为34.25%,其中9月份的危害最严重,危害率高达17.42%;该防护套可有效防止林业鼠类对林木的危害,实验期间未发现一例树木受到鼠类的危害,同时,PVC防护套亦未增加其它树木受到危害的概率。建议在每年的9月之前对树木采取防护措施,以提高其对树木的防护效率。

英文摘要：

We tested the effects of using fencing of PVC fencing sheath on young forest stands in an area of converting the land for forestry. From September of 2004 to April of, 2005, the experiments were conducted in area of converting the land for forestry in Hangjinhouqi, Bayannaor, Inner Mongolia and the damage was monthly census. The results as follow： The damage duration in the area was from September to November of 2004, and the accumulative damage rate was 34. 25% , especially during September of 2004, which was up to 17. 42%. The PVC fencing sheath was of availability in avoiding damage of young forest stands by rodents. There was no one sapling damaged by rodents ; and furthermore, the treatment did not increase the proportion of damage in other young stands. We suggest fencing measures should be done before September.