Introduction -- Basic concepts and terminology -- Biogeochemical properties of wetlands -- Electrochemical properties -- Carbon -- Oxygen -- Adaptation of plants to wetland soil conditions -- Nitrogen -- Phosphorus -- Manganese and iron -- Sulfur -- Trace metals -- Toxic organic compounds -- Transport processes -- Biogeochemical indicators -- Wetlands and global climate change -- Freshwater wetlands : the Everglades -- Coastal wetlands : Louisiana Gulf Coast wetlands -- Advances in biogeochemistry.