Effects of elevated CO_2 concentrations on photosynthesis, dark res- piration and RuBPcase activity of three species seedings in Changbai Mountain

摘要

Two-year-old seedings of Pinus koraiensis, Pinus sylvestriformis and Fraxinus mandshurica were treated in open-top chambers with elevated CO_2 concentrations (700 μL.L~-1, 500 μL.L~-1) and ambient CO_2 concentrations (350 μL.L~-1) in Changbai Mountain from June to Sept. in 1999 and 2001. The net photosynthetic rate, dark respiration rate, ribu- Lose-1,5-bisphosphate carboxlase (RuBPase) activity, and chlorophyll content were analyzed. The results indicated the RuBPcase activity of the three species seedlings increased at elevated CO_2 concentrations.