森林是地球生命发展史上的生物摇蓝,是陆地生态系统的主体。人类从森林那里获取了无穷无尽的物质和能量。但是,由于种种原因,地球上的森林由19世纪的55亿公顷,剧减到现在的28亿公顷。目前,全世界每年正以1000-4000万公顷的速度毁灭森林。面对现实,人们不能不感到森林生存的危机! Forests are the biological bluffs in the history of the earth’s life and are the main body of terrestrial ecosystems. Humans have acquired untold material and energy from the forests. However, for a variety of reasons, the earth’s forests have dropped dramatically from 5.5 billion hectares in the 19th century to 2.8 billion hectares now. At present, the world is deforestation at a rate of 10 to 40 million hectares annually. In the face of reality, people can not but feel the crisis of forest survival!