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森林是一个异常庞大、十分复杂的生态系统,在没有人类干扰的年代,它也会自然发火。雷电击火、腐殖质着火、煤炭自然、瓦斯自燃……都可以引起林火。森林火种还是原始人类取火的来源。人类进入森林,出现了人为的林火。随着人口增加和林业生产活动的扩大,人为林火意烧愈旺,其频率远远超过了自然林火,成为森林最大的祸患。目前世界每年发生森林火灾20万起以上,烧毁森林超过280万公顷,约占世界森林面积的0.1％以上,其中雷击等自然林火仅占林火总起数的10％,人为林火占90％。自然林火一般都发生在远离
The forest is an unusually large and complex ecosystem that naturally fires without human disturbance. Lightning fire, humus fire, natural coal, gas spontaneous combustion ... ... can cause fire. Forest fire is still the source of the original human fire. Human beings enter the forest and human fires have appeared. With the increase of population and the expansion of forestry production activities, man-made forests become more prosperous and their frequency far exceeds the natural forest fire and become the biggest scourge of the forest. At present, there are more than 200,000 forest fires each year in the world, burning more than 2.8 million hectares of forests, accounting for more than 0.1% of the world’s forest area, of which natural forest fires such as lightning strike only account for 10% of the total number of forest fires and man-made forest fires account for 90% %. Natural forest fires generally occur far away