火灾对森林的危害和造成的损失是巨大的。世界每年大约发生森林火灾二十多万次,烧毁森林近千万公顷。一些森林资源比较丰富的国家,如美国、加拿大、澳大利亚、苏联等森林火灾都很严重。为了有效预防烧毁森林,近年来越来越多的运用规定火烧(人为控制计划火烧)的先进方法来预防森林火灾的发生,收到了很好的效果。自然界中,绿色植物吸收太阳能,摄取空气中的二氧化碳和土壤中的营养物质和水分,制造有机物质,这种能量积累,森林可燃物的不断增加,迟早必然要发生爆炸式的 The damage caused by the fire to forests and the losses they caused are enormous. There are about 200,000 forest fires and about 10 million hectares of forest burned each year in the world. Some forest fires in countries rich in forest resources, such as the United States, Canada, Australia and the Soviet Union, are serious. In order to prevent the burning of forests effectively, more and more efforts have been made to prevent the occurrence of forest fires in recent years by applying advanced methods of setting fire (artificially controlled fire plans) and receiving good results. In nature, green plants absorb solar energy, ingest carbon dioxide in the air and nutrients and moisture in the soil to produce organic matter. This energy accumulation, the increasing amount of forest combustibles, is bound to explode sooner or later