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在人工控制CO2浓度梯度条件下,研究了丁香叶片光合速率、气孔导度和蒸腾速率对CO2浓度升高的响应。结果表明:CO2浓度升高对丁香的光合生理有明显的影响,当CO2浓度为当前浓度至加倍(360～720μmol﹒mol-1)范围内,各光合指标随CO2浓度增加而增大,继续升高CO2浓度则开始下降。在较强光照下,升高CO2浓度对丁香有“气肥”作用。丁香达光合能力值适宜的光合有效辐射强度为1000μmol﹒m-2s-1,CO2浓度为700μmol﹒mol-1。未来CO2浓度升高,不仅有利于丁香的光合作用,而且可提高丁香的水分利用效率。
Under the artificial control of CO2 concentration gradient, the responses of clove leaf photosynthetic rate, stomatal conductance and transpiration rate to elevated CO2 were studied. The results showed that CO2 concentration had a significant effect on the photosynthetic physiology of clove. When the CO2 concentration ranged from the current concentration to double (360 ~ 720μmol.mol-1), the photosynthetic parameters increased with the increase of CO2 concentration and continued to increase High CO2 concentration began to decline. In a strong light, increasing the concentration of CO2 on the clove have “gas fertilizer” effect. The optimum photosynthetic available radiation intensity of lilac reaches 1000μmol. m-2s-1, CO2 concentration of 700μmol. mol-1. The future increase in CO2 concentration, not only conducive to clove photosynthesis, but also improve the clove water use efficiency.