大气CO_2浓度升高对棉花生理特性和生长的影响

The Effects of the Atmospheric CO 2 Concentration Increase on Physiological Characters and Growth of Cotton

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。

Based on the experiment in the plant growth chamber, this paper analysed the effects of the atmospheric CO 2 concentration doubling on leaf stomatal resistance and conductance, leaf temperature, photosythesis and evapotranspiration rate, growth and dry matter storage of cotton etc. The study showed that cotton leaf stomatal resistance, leaf temperature, photosythesis rate, growth and water use efficeiency increase; leaf conductance and evapotranspiration rate decrease with the atmospheric CO 2 concentration increase; There were obvionsly different in the characters of cotton responses to CO 2 enriched under different soil moisture treatunent (high and low). The positive effects of photosynthesis and growth, and diverse effects to evapotranspriation. With elevated CO 2 reduce the unfavorable effects of crop photosynthesis and growth owing to water stress. There was a increasing extent of cotton water use efficiency (WUE) in low soil moisture regime than high soil moisture regime.