Changes of photosynthetic capacity of some plant species under very high CO_2 concentrations in Biosphere 2

THE responses of plant photosynthesis to elevated CO2 could be divided into short-term re-sponse and long-term response or acclimation.In the short-term response,photosynthesiscan be enhanced at the beginning of high CO2 treatment for most C3 carbon fixation species,but the photosynthetic rate may decrease when the plants are exposed to that high CO2 for