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植物是通过光合作用吸收空气中的二氧化碳来促进其生长发育的,所以二氧化碳是光合作用的主要原料。在一定范围内,植物的光合作用与二氧化碳浓度呈正相关,其浓度大小制约着光合作用的强弱,如果二氧化碳的浓度过低(250ppm以下),将严重地抑制植物的生长发育。温室和大棚等保护地设施,是相对密闭的栽培场所,其空气中二氧化碳浓度与室外有明显的差异。而植物夜间呼出二氧化碳.再加上土壤中有机物分解排出二氧化碳,到日出之前可使棚内二氧化碳浓度达到400-500ppm(大气中二氧化碳浓度为
Plants absorb carbon dioxide in the air through photosynthesis to promote their growth and development, so carbon dioxide is the main raw material for photosynthesis. Within a certain range, the photosynthesis of plants is positively correlated with the concentration of carbon dioxide. The concentration of these compounds restricts the photosynthesis. If the concentration of carbon dioxide is too low (below 250ppm), it will seriously inhibit the growth and development of plants. Greenhouses and greenhouses and other protected facilities, is a relatively confined cultivation sites, the concentration of carbon dioxide in the air and there are significant differences. While plants exhale carbon dioxide at night. Coupled with the decomposition of organic matter in the soil discharge of carbon dioxide, before sunrise can make the greenhouse carbon dioxide concentration reached 400-500ppm (atmospheric carbon dioxide concentration