Reclaimed saline‐alkali paddy field may be a hotspot of methane and ammonia emissions

Salinization and alkalization are global environmental issues, and a growing area of saline‐alkali land has been developed as paddy fields. However, the information on the characteristics and driving mechanisms of greenhouse gas (i.e., methane (CH 4 ), carbon dioxide (CO 2 ) and nitrous oxide (N 2 O)) and ammonia (NH 3 ) emissions from paddy fields with different saline‐alkali levels is limited. We conducted a 137‐day mesocosm experiment to investigate these issues using light (L), moderate (M), and heavy (H) saline‐alkali soils with a history of reclamation of 20, 4 and 2 years, respectively. The results demonstrated that both the cumulative CH 4 and NH 3 fluxes in H treatment were significantly ( p