作用
Effect
补充空气中的氧。成年人一昼夜需要消耗0.75千克的氧气、排出 0.9千克的二氧化碳。不少工厂也往大气中排放二氧化碳。大气中的氧气要及时补充，二氧化碳要不断排除以维持空气的正常组成成分。绿化植物在进行光合作用时，吸收空气中的二氧化碳，放出氧气。地球上的植物每年为人类处理掉近千亿吨的二氧化碳。空气中有60%的氧气是由森林、绿地制造的。
Replenish oxygen in the air. Adults consume 0.75 kg of oxygen and emit 0.9 kg of carbon dioxide a day and night. Many factories also emit carbon dioxide into the atmosphere. Oxygen in the atmosphere should be replenished in time, and carbon dioxide should be continuously excluded to maintain the normal composition of the air. Green plants absorb carbon dioxide in the air and emit oxygen during photosynthesis. Plants on Earth dispose of nearly 100 billion tons of carbon dioxide annually for humans. 60% of the oxygen in the air is produced by forests and green areas.
吸收大气中的有害气体。许多植物具有较强的吸收过滤大气中有害气体的能力。如绿化能有效地减少汽车尾气中的氮氧化合物，从而减少大气中臭氧的发生量和防止光化学烟雾的形成；柳杉、梧桐、泡桐、柑橘能吸收二氧化碳；刺槐、桧柏、女贞、向日葵等能吸收氟化氢；槐、银桦、悬铃木等能吸收氯和氯化氢；夹竹桃、桑、棕榈能吸收汞；铁树、美洲槭能吸收大气中苯、醛、酮、醇、醚等等。此外，有些树的叶子还能吸收大气中的铅、镉和砷。
Absorbing harmful gases in the atmosphere. Many plants have strong ability to absorb and filter harmful gases in the atmosphere. For example, greening can effectively reduce nitrogen oxides in automobile exhaust, thus reducing the occurrence of ozone in the atmosphere and preventing the formation of photochemical smog; Cryptomeria fortunei, Ficus sylvestris, Paulownia, Citrus can absorb carbon dioxide; Robinia pseudoacacia, Betula platyphylla, Ligustrum lucidum, Sunflower and so on can absorb hydrogen fluoride; Robinia pseudoacacia, Betula platyphylla, and so on can absorb chlorine and hydrogen fluoride. Hydrogen chloride; oleander, mulberry and palm can absorb mercury; Acer can absorb benzene, aldehyde, ketone, alcohol, ether and so on. In addition, the leaves of some trees can absorb lead, cadmium and arsenic in the atmosphere.