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大气中ＣＯ２浓度对Ｃ３、Ｃ４作物有不同程度的影响。本文通过对Ｃ３作物小麦、大豆、大白菜和Ｃ４作物玉米在不同ＣＯ２浓度（３５０×１０－６、５００×１０－６、６００×１０－６、７００×１０－６）条件下生长的模拟实验研究表明：Ｃ３、Ｃ４作物的株高，叶面积指数，根茎叶干重和产量随ＣＯ２浓度增加而增长。ＣＯ２浓度为７００×１０－６、５００×１０－６处理分别比３５０×１０－６处理的玉米干物重增长１３．８％和５．６％，产量增长１８．２％和８．７％；小麦干物重增长２６．１％和１３．７％，产量增长３６．１％和１７．２％；大豆干物重增长２５．４％和１８．１％，产量增长３２．９％和３０．２％；大白菜干物重增长２０．０％和１３．３％。Ｃ３比Ｃ４作物对ＣＯ２浓度增加的反应更为敏感。
Atmospheric CO2 concentration of C3, C4 crops have varying degrees of impact. In this paper, we simulated the growth of C3 crops of wheat, soybean, Chinese cabbage and C4 crops with different CO2 concentrations (350 × 10-6,500 × 10-6,600 × 10-6,700 × 10-6) The results showed that plant height, leaf area index, root and stem leaf dry weight and yield of C3 and C4 crops increased with the increase of CO2 concentration. The CO2 concentration increased by 13.8% and 5.6% respectively and the yield increased by 18.2% and 8.7% respectively when the CO2 concentration was 700 × 10-6 and 500 × 10-6. The dry weight of wheat increased by 26.1% and 13.7%, and the output increased by 36.1% and 17.2% respectively. The dry weight of soybean increased by 25.4% and 18.1%, the output increased by 32.9% and 30.2% %; Chinese cabbage weight gain by 20.0% and 13.3%. C3 is more sensitive than C4 crops to the increased CO2 concentration.