Typhoon-induced increases in porewater nutrient concentrations and CO2 and CH4 emissions associated with salinity and carbon intrusion in a subtropical tidal wetland in China: A mesocosm study

Typhoons can alter carbon cycling by increasing inputs and the oceanic water intrusion at low latitudes. Our understanding of how typhoons impacts C N cycles reflecting combine separate effects elevated salinity enrichment is poor. We conducted a mesocosm experiment simulating effect 10‰ dissolved organic (DOC) surface with acetate as DOC source on dynamics porewater nutrients emissions carbonaceous greenhouse gases using plants soil system from Cyperus malaccensis freshwater wetland in Min River estuary, southeastern China. The concentrations NH4+-N NO3?-N rose under but decreased enrichment, combination acted antagonistically such that there was no compared to control. A increase increased cumulative CO2 (+29%) CH4 (?61%) during growing season. In response DOC, 79% 84%, respectively. combined 69% methane 44%. Elevated plus activity N-cycling enzyme ?-1,4-N-acetylglucosaminidase, activities two C-cycling enzymes (?-1,4-glucosidase 1,4-?-cellobiosidase) P-cycling acid phosphatase, indicating higher demand for P relative N. all cases, only case addition, rising inorganic fluxes salt suggeated induced may thus accelerate release have little influence tidal ecosystems.