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近年来,我局樟子松人工林面积不断扩大,总面积已达七千多亩。自一九八二年以来,由于鼠害的发生,给樟子松人工幼林的生长和发育造成了直接威胁。一九八二年十月至一九八三年四月,我们对害鼠的活动规律及其为害特点进行了详细观察,现将结果整理如下。一、发生与危害到一九八三年春季为止,全局受害的樟子松人工幼林面积达5,750亩,占樟子松人工幼林总面积的82.1％,其中受害严重的有2,880亩,约占受害面积的一半。在受害的樟子松林周围的红松、落叶松、杨树等树种也遭受不同程度的危害。被害部位有的呈条状或环状剥
In recent years, I Bureau of Pinus sylvestris plantation area continues to expand, with a total area of more than 7000 acres. Since 1982, the occurrence of rodent pests has posed a direct threat to the growth and development of Pinus sylvestris young plantations. From October 1982 to April 1983, we conducted a detailed observation on the law of pest movement and its peculiar traits. The results are summarized as follows. I. Occurrence and Harmness By the spring of 1983, the total area of Pinus sylvestris plantation affected by the overall situation reached 5,750 mu, accounting for 82.1% of the total area of Pinus sylvestris young plantation, of which 2,880 mu Half the area. Pine trees, larch trees and poplar trees around Pinus sylvestris var.mongolica have also suffered different degrees of harm. Some of the victims were strip or ring stripping