Greenhouse Gases

CO2, NO2, CH4,

Methanogenesis from wetlands accounts for 40-50% of methane to atmosphere

Papyrus swamps, Rice paddies, Mangroves

Methane emissions from wetlands greater with effluent addition

Open peatlands source of CH4; forested peatlands low or sink of CH4

CH4 emissions from impounded reservoirs: soil organics, watershed and phytoplankton

Dissolved CH4 from reservoirs increases BOD downstream

N2O release from rivers can be 0 to 100% of N gas emissions