森林害鼠是广泛生活在人工林和天然次生林中的小型啮齿类动物,具有适应性强和繁殖速度快的特点。它们啃食多种针、阔叶树和灌木的树根、树干、树枝的嫩皮和林木的果实、种子,经常造成大面积幼林的死亡和种子的歉收,对林木的危害十分严重,成为林业生产的一大灾害。我国林区害鼠的种类比较多,在东北林区常发生的种类有红背(鼠平)、棕背(鼠平)、沼泽田鼠和东北鼢鼠等;在西北林区常发生的种类有中华鼢鼠、沙鼠、社鼠和花鼠等。在人工林和天然次生林中,害鼠危害林木的一般规律是:幼树 Forest rat is a small rodent widely living in plantations and natural secondary forests, with strong adaptability and breeding speed characteristics. They bite a variety of needle, broad-leaved tree and shrub tree roots, tree trunks, branches of the tender skin and forest fruits, seeds, often resulting in large areas of young forest and seed failure, the damage to the trees is very serious and become a forest production A big disaster. There are many species of harmful rats in the forest area of ​​our country. There are redbacks (rodents), brown backs (rodents), marsh vole and northeast zokor in the forests of the northeastern China. Chinese zokor, gerbils, social rats and rat and so on. In planted forests and natural secondary forests, the general rule that pests harm trees is: young trees