松嫩平原两种C_4植物对CO_2倍增的光合生理响应(简报)  

Effects of CO_2 doubling on the photosynthetic physiological characteristics of two C_4 pathway species on the Songnen Plains of China

作　　者：王立[1] 杨允菲[1] 孙伟[1] 王德利[1] 

机构地区：[1]东北师范大学草地研究所植被生态科学教育部重点实验室,吉林长春130024

出　　处：《草业学报》2003年第5期103-105,共3页Acta Prataculturae Sinica

基　　金：国家重点基础研究发展规划项目(G1999043407);国家自然科学基金项目(30070137)。

摘　　要：Through a gradient experiment controlling CO2 concentration and illumination intensity, the photosynthetic physiological characters of two C4 pathway plants, Setaria viridis and Pennisetum flaccidum, were measured on the Songnen Plains of China. The results showed that the net photosynthetic rate (Pn) of S.viridis was higher than P.flaccidum. As the CO2 concentration increased, Pn of the two species both increased until the CO2 concentration reached approximately 600 μmol/mol, after which Pn decreased. At the same time, the light compensation points of the two species gradually dropped. This is related to the inhibition of dark respiration with high CO2 concentration.Through a gradient experiment controlling CO2 concentration and illumination intensity, the photosynthetic physiological characters of two C4 pathway plants, Setaria viridis and Pennisetum flaccidum, were measured on the Songnen Plains of China. The results showed that the net photosynthetic rate (Pn) of S.viridis was higher than P.flaccidum. As the CO2 concentration increased, Pn of the two species both increased until the CO2 concentration reached approximately 600 μmol/mol, after which Pn decreased. At the same time, the light compensation points of the two species gradually dropped. This is related to the inhibition of dark respiration with high CO2 concentration. 

关 键 词：松嫩平原 C4植物 CO2 光合生理 光合作用 光照强度 气孔导度 拟合曲线 参数值 

分 类 号：Q945[生物学—植物学]