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利用半封闭式同化箱研究在７００、５００、３５０μＬ／ＬＣＯ２浓度条件下大白菜莲座期生长性状和生理特性的不同反应。结果表明，提高ＣＯ２浓度，可促进白菜光合作用，延长光合时间，降低光补偿点。与３５０μＬ／Ｌ相比，７００和５００μＬ／Ｌ光合速率增加６８％和３９％，光合时间延长５５和２５分钟。同时，ＣＯ２浓度增高，减小了气孔导度，叶温升高，蒸腾系数减弱，从而提高了水分利用率。７００和５００比３５０μＬ／Ｌ叶温分别增加０．５℃和０．１３℃，蒸腾系数降低２７．１％和２３．１％，叶面积增长８６．４％和７９．１％，叶片数增加８０．７％和４０．９％．鲜重增加７６．１％和５２．９％，干重增加３１．０％和２８．２％。
Semi-enclosed assimilation boxes were used to study the different responses of the rosette to the growth traits and physiological characteristics of Brassica campestris at 700, 500 and 350 μL / LCO2 concentrations. The results showed that increasing CO2 concentration could promote the photosynthesis of cabbage, prolong the photosynthetic time and reduce the light compensation point. Compared with 350μL / L, the photosynthetic rates of 700 and 500μL / L increased by 68% and 39%, and the photosynthetic time was prolonged by 55 and 25 minutes. At the same time, CO2 concentration increased, stomatal conductance decreased, leaf temperature increased, and transpiration coefficient decreased, thus increasing water use efficiency. 700 and 500 increased 0.5 ° C and 0.13 ° C respectively than 350μL / L, transpiration coefficients decreased by 27.1% and 23.1%, leaf area increased by 86.4% and 79.1%, and the number of leaves increased 80.7% and 40.9%. Fresh weight increased 76.1% and 52.9%, dry weight increased 31.0% and 28.2%.