Abstract This study investigated, using the closed chamber method, impact of (1) vegetation community type (Typha latifolia, Cyperus papyrus and Phragmites mauritianus) in a natural tropical freshwater marsh wetland (marsh) (2) conversion into rice paddy (rice paddy), on nitrous oxide (N2O) emission. Both were continuously flooded, while was unfertilized. Average N2O emission from did not vary ...