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CO_2是植物进行光合作用的主要原料之一。在保护地密闭的状态下,气体交换受到限制,日出后随光合作用逐渐增强,CO_2浓度逐渐降低,即使此时光照、温度都很好,
CO_2 is one of the main raw materials for plant photosynthesis. In a confined environment, the gas exchange is limited, with the photosynthesis gradually increased after sunrise, CO 2 concentration gradually decreased, even if the light at this time, the temperature is good,