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火灾是森林的大敌。在世界上每年发生森林火灾多达几十万次。火烧面积几百万公顷,有时竟达1000万公顷。每年大约有1000人在森林火灾中丧失。美国平均每年发生森林火灾1万次,加拿大7000多次,澳大利亚1700多次,日本6900多次,联邦德国1400多次,苏联3000次。我国建国以来,总共发生森林火灾55万次,平均每年1.6万次;烧毁山林约5亿亩,相当于解放后我国人工造林保有面积的43%。如果按木材蓄积量计算,我国的森林火灾是世界上较为突出的,因为我国森林面积仅有18亿亩,木材蓄积量只有
Fire is the enemy of the forest. There are hundreds of thousands of forest fires a year in the world. Burning area of millions of hectares, sometimes as much as 10 million hectares. About 1,000 people are lost each year in forest fires. The average annual incidence of forest fires in the United States is 10,000 times, more than 7,000 times in Canada, 1,700 times in Australia, 6,900 times in Japan, more than 1,400 times in the Federal Republic of Germany and 3,000 times in the Soviet Union. Since the founding of our country, a total of 550,000 forest fires have occurred, with an average of 16,000 times each year. About 500 million mu of mountain forests have been burned down, equivalent to 43% of the area reserved for artificial afforestation in China after the liberation. If calculated according to the volume of timber, forest fires in our country is more prominent in the world, because only 18 million mu of forest area in our country, only the volume of timber stock