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1987年“五·六”森林大火,使大兴安岭北坡4个林业局的104万公顷森林受害,其中重度火烧(烧死木蓄积占林分总蓄积的60%以上)的林地40余万ha.地处漠河林区的西林吉林业局受害最重,过火面积最大,过火林地30.54万ha,占北四局的29.31%,其中重度火烧林地面积达10.63万ha,占北四局的26.4%,中度火烧(烧死木蓄积占林分总蓄积的31%～60%)以上的林地,幼树全部被烧死.这样大的火烧面积,显然不能全靠人工更新来恢复森林.这主要是因为一是立地条件普遍较差,土层薄地段和水湿地皆难以造林;二是目前苗木、劳力缺
In 1987, “May 6th” forest fire destroyed 1.04 million hectares of forest in 4 forestry bureaus on the northern slope of Daxinganling. Among them, over 400,000 pieces of woodland with heavy fire (burning wood accumulating over 60% of the total volume of forest) ha. The Xilinji Forestry Bureau, which is located in Mohe Forest District, suffered the most damage and had the largest fire area. There were 305,400 ha of overheated forest land, accounting for 29.31% of the fourth inning. Among them, the area of heavy firewood forest reached 106,300 ha, accounting for 26.4 %, Medium fire (burning of dead wood accounts for 31% to 60% of the total volume of forest stand) more than the woodland, saplings were all burned to death .This large area of fire, apparently can not rely entirely on manual renewal to restore the forest. Mainly because the first site conditions are generally poor, thin layer of land and water wetland are hard to afforestation; Second, the current seedlings, labor shortage