不同浓度CO2对黄瓜光合速率的影响

研究了CO2浓度在200、350、500、700、1 000 mg/kg处理下的黄瓜叶片的光合速率.结果表明:增加CO2浓度,可显著提高黄瓜叶片的光合速率,在强光下,效果尤其明显.黄瓜叶片光合速率对不同CO2浓度的响应都有一个由低到高再低的趋势.空气CO2浓度,细胞间隙CO2浓度与光合速率是一致的,在高CO2浓度下,气孔导度一般不是光合速率的限制因子.

Effect of CO2 Concentrations on Photosynthetic Rate of the Cucumber

This experiment dealt with the influence of CO2at the concentrations of 200,350,500,700 and 1000 mg/kg on photosynthetic. The results showed that the CO2 enrichment did increase the photosynthetic rate of upper leaves of cucumber, especially under intensive light conditions. The response of photosynthetic rate to the different CO2 concentrations appeared low at the beginning, then higher and finally lower. The photosynthesis rate was positively correlated with the atmospheric and intercellular CO2 concentrations. Generally the stomatal conductance was not a factor to inhibit photosynthetic at high CO2 concentrations.