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二氧化碳(CO_2)气体是植物进行光合作用的重要原料。在塑料大棚内由于蔬菜每天(日出之后)进行光合作用,二氧化碳之含量会迅速下降,甚至会降低到大气中自然正常浓度(300
Carbon dioxide (CO2) gas is an important raw material for photosynthesis of plants. As the photosynthesis of vegetables in the plastic greenhouse occurs daily (after sunrise), the amount of carbon dioxide rapidly decreases and even decreases to a naturally occurring normal concentration in the atmosphere (300