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ＣＯ２是绿色植物进行光合作用生产有机物质的必需原料，温室大棚内ＣＯ２浓度只有室外大气中ＣＯ２浓度的１／３左右，因此影响大棚栽培植物的产量和质量。对温室大棚香椿进行ＣＯ２施肥，提高温室饱合点，降低光合补偿点，从而提高光合速率、蒸腾速率和光合水分利用率，可使椿芽增产３９７％左右，并且芽嫩、叶厚、质量好，经济效益提高５０％左右。
CO2 is an essential raw material for photosynthesis of organic matter produced by green plants. The CO2 concentration in greenhouse is only about 1/3 of the CO2 concentration in outdoor atmosphere, which affects the yield and quality of greenhouse cultivated plants. The CO2 fertilization of Toona sinensis in greenhouse increased the saturated point of greenhouse and decreased the photosynthetic compensation point, thus increasing the photosynthetic rate, transpiration rate and photosynthetic water use efficiency, which could increase the yield of poplar by about 39.7% and the bud tenderness, leaf thickness and mass Good, economic efficiency increased by about 50%.