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森林在保护和改善环境、促进人体健康方面的效益,远比人人皆知的防风和提供木材方面价值大得多。因此,人们誉称森林是不用缴费的“绿色医院”。 森林是氧气制造厂。氧气是维持生命的基本因素之一,人和动物都在不停地呼吸,吸进氧气,呼出二氧化碳。二氧化碳是有害气体,空气中通常的浓度是0.03％,达到4％时,人就感到头痛、耳鸣、脉搏缓慢、血压增高;达到10％时,人就会死亡。森林在进行光合作用时,不但吸收空气中的二氧化碳,而且放出氧气,一亩阔叶林每天约呼出
The benefits of forests in protecting and improving the environment for human health are far more valuable than the well-known windbreaks and the provision of wood. Therefore, people claim that the forest is a “green hospital” without paying fees. The forest is an oxygen factory. Oxygen is one of the basic elements of life. People and animals are constantly breathing, taking in oxygen and exhaling carbon dioxide. Carbon dioxide is a harmful gas. The usual concentration in the air is 0.03%. When it reaches 4%, people feel headaches, tinnitus, slow pulses and high blood pressure. When they reach 10%, they will die. In the process of photosynthesis, the forest not only absorbs the carbon dioxide in the air, but also emits oxygen, and the acre broadleaf forest exhales about every day