[Effects of Elevated Ozone and Nitrogen Deposition on Photosynthetic Characteristics and biomass of ].

The open top chambers were used to explore the influences of nitrogen deposition on the response of photosynthetic characteristics of to ozone. The results showed that the net photosynthetic rate (), apparent electron transport rate (ETR), excitation energy capture efficiency of PSⅡ reaction center ('/'), coefficient of photochemical quenching (qP), the maximum of carboxylation efficiency () and the maximum rate of electron transport () were significantly decreased with the increasing O concentration. However, intercellular CO concentration () was significantly increased and stomatal conductance () remained unchanged. There was significant difference in biomass at the end of growing season. However, in a certain extent, nitrogen deposition improved photosynthetic capacity and biomass of . The interaction of O and nitrogen deposition was not significant in terms of plant photosynthetic characteristics. The current results provided scientific basis for the protection of in response to the global O concentration and nitrogen deposition increase.