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根据在人工气候室取得的试验资料，分析了大气ＣＯ２ 浓度倍增对棉花叶气孔阻力和导度、叶温、叶光合和蒸腾速率、生长状况与干物质积累等的影响．结果表明，大气ＣＯ２ 浓度倍增，棉花叶气孔阻力增加，导度降低，叶温增加，光合速率增大，蒸腾速率降低，水分利用效率明显提高，棉花生长加快．这些性质的变化在不同土壤水分条件下（高低两种水分处理）产生明显的差异，表现为大气ＣＯ２ 浓度增加对光合速率和生长的正效应及其对蒸腾的抑制作用削弱了水分胁迫对棉花光合和生长产生的不利影响，在低水分条件下棉花水分利用效率增加的比例大于高水分条件下的
Based on the experimental data obtained in the artificial climate chamber, the effects of atmospheric CO2 concentration doubling on stomatal resistance and conductance, leaf temperature, leaf photosynthesis and transpiration rate, growth status and dry matter accumulation were analyzed. The results showed that doubled atmospheric CO2 concentration increased the stomatal resistance, decreased the conductance, increased the leaf temperature, increased the photosynthetic rate, decreased the transpiration rate, and significantly enhanced the water use efficiency of cotton leaves. The cotton growth accelerated. The changes of these properties were significantly different under different soil moisture conditions (high and low water treatment), showing the positive effect of increasing atmospheric CO2 concentration on photosynthesis rate and growth and its inhibition on transpiration weakened the effect of water stress on photosynthesis of cotton And the adverse effects of growth, the proportion of water use efficiency of cotton under low water conditions increased more than under high water conditions