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在人类的史前时期,陆地面积为149亿公顷的地球上,约有三分之二以上的地面被茂密的森林覆盖着,森林面积1,500多亿亩。森林以它特有的功能,调节着气候,维持生态平衡,改良、发育土壤,固定太阳能,养育着动物,哺育着人类,是文明的摇篮。随着人类历史的发展,对森林的破坏加剧,到19世纪中叶,已下降到825亿亩,1963年减少到570亿亩,现在只有420亿亩(15亿亩为人工林),复被率
In human prehistoric times, about 14.9 billion hectares of land on Earth, about two thirds of the ground covered by dense forests, the forest area of over 150 billion mu. The forest, with its unique function, regulates climate, maintains ecological balance, improves soil development, fixes solar energy, nourishes animals and nurtures humans. It is the cradle of civilization. With the development of human history, the destruction of forests intensified. By the middle of the 19th century, it had dropped to 82.5 billion mu from 57.6 billion mu in 1963, and now it has only 42.0 billion mu (1.5 billion mu of plantations)