In order to evaluate the effects of plant diversity on ammonia volatilization and greenhouse gas emission in wetland,two common monocultures of Hydrocotyle vulgaris and Myriophyllum aquaticum and the mixture of two species in Xixi Wetland National Park were studied,and the ammonia volatilization,emissions of methane and nitrous oxide,nitrogen concentration in water and plant biomass of the communities were investigated. The results showed the hybrid system reduced the flux of ammonia volatilization and N2 O...