关键词: 凤梨科, 紫星凤梨, 光合特性, CO₂, 生长

Abstract: The effects of CO₂ enrichment on net photosynthetic rate ( Pn) , growth, photosynthetic enzyme activity and flowering of Guzmania ‘Luna’were studied in plastic greenhouse. The results showed that CO₂ enrichment caused obviously increase in Pn. Pn was increased by 26.18% , 43.49% in treatment of CO₂(600 ±40) μmol·mol^{- 1} , (900 ±40) μmol·mol^{- 1} as compared with control [CO₂ concentration was (360±30) μmol·mol^{- 1} ] , respectively, when treated 90 d. Stomata conductance and transp iratory rate of Guzmania ‘Luna’were reduced by CO₂ enrichment. But the leaf area and plant height were increased by 15.01% , 11.12% in treatment of CO₂ (600 ±40) μmol·mol^{- 1} , and 18.99% , 16.98% in CO₂ (900 ±40) μmol·mol^-1 when treated for 90 d. In addition, the accumulation of soluble sugar and starch were promoted, but the activity of glycolate oxidase was apparently decreased by CO₂ enrichment, respectively, flowering of Guzmania ‘Luna’was also promoted.

Key words: Bromeliaceae, Guzmania ‘Luna’, Photosynthetic characteristic, CO₂, Growth