Abstract:Employing floating static chamber-chromatography method, the greenhouse gases(GHGs) fluxes, which include CO2, CH4 and N2O, at the water-air interface of four rivers(Tuanjie River, Jinchuan River, Inner and Outer Qinhuai River)and Dingjie Reservoir were continuously monitored in Nanjing during spring in 2012. And based on these observed data, the variation and influencing factors of GHGs fluxes were analyzed. The results showed that the CO2 and CH4 emission fluxes of Tuanjie River were top, which were 1023.34mg/(m2·h) and 89.45mg/(m2·h), respectively, and Jinchuan River followed; CO2 fluxes from Inner and Outer Qinhuai River were at the same magnitude;CH4 fluxes emitted from Inner Qinhuai were one magnitude less than Outer Qinhuai; and CO2 and CH4 fluxes from Dingjie Reservoir were the lowest among the waters. As for N2O fluxes, Jinchuan River was the highest [151.31μg/(m2·h)], followed by Tuanjie River (111.74μg/m2·h), and Inner/Outer Qinhuai River and Dingjie Reservoir perform modest with 101 magnitude. In addition, all of the waters were GHGs emission sources except Jinchuan River being N2O sink. We also concluded that the mainly influencing factors on GHGs fluxes of Inner Qinhuai/Dingjie Reservoir, Outer Qinhuai ,Jinchuan and Tuanjie River were human’s activities, water level, microbial activity and joint actions of wind speed and temperature, separately. The five waters studied in this paper were emission sources of the three major GHGs in spring.