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森林是氧气的加工厂。林木的叶子在进行光合作用时,吸收空气中的二氧化碳,同时放出氧气。据测定,每公顷森林一天可吸收二氧化碳1000多公斤,相当于1000多人一天二氧化碳的呼出量。同时放出氧气730公斤,相当于970多人的吸进氧气量。如果说每人每年标准用量是400公斤氧气,再考虑各种燃料燃烧产生的二氧化碳等因素,每人必须有40平方米以上的森林绿地为其制造氧气。朝鲜平壤目前平均每人有绿地面积70多平方米,市内空气新鲜。我省现有森林每天可放出氧气286063万公斤,估价28.6亿元,每年产氧气估价为10439亿元。
The forest is oxygen processing plant. Trees in the leaves of photosynthesis, the absorption of carbon dioxide in the air, while releasing oxygen. It is determined that per hectare of forest can absorb more than 1,000 kilograms of carbon dioxide a day, equivalent to more than 1,000 people a day of carbon dioxide exhaled. At the same time released 730 kilograms of oxygen, equivalent to more than 970 inhaled oxygen. If we say that the standard annual consumption of 400 kilograms of oxygen per person, and then consider the various types of fuel combustion of carbon dioxide and other factors, each person must have more than 40 square meters of forest green space for the manufacture of oxygen. At present, on average, each of North Korea’s Pyongyang has more than 70 square meters of green space and the city has fresh air. The existing forest in our province can release 2860.63 million kilograms of oxygen a day, with a valuation of 2.86 billion yuan and annual production of oxygen at 1,043.9 billion yuan.