CH sub(4) and N sub(2)O Emissions from Spartina alterniflora and Phragmites australis in Experimental Mesocosms

CH sub(4) and N sub(2)O emissions from Spartina alterniflora and Phragmites australis in experimental mesocosms were discussed. It was observed that trace gas emission rates were higher in S. alterniflora than P. australis mesocosms due to the higher biomass and density of the former, which could fix more available substrates to the soil and potentially emit more trace gases. Trace gas emission rates were higher in non-submerged than sub-merged soils, suggesting that water might act as a diffusion barrier in the brackish marsh mesocosms. Methane (CH sub(4)) emission rates were loser in clipped non-submerged mesocosms than in non-clipped submerged mesocosms but nitrous oxide emissions were enhanced.