BIOL333 Lecture Notes - Lecture 9: Photosynthesis, Bioremediation, Freshwater Marsh
18 Nov 2018
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Anaerobic metabolism, presence of water and organic matter, water limits the diffusion of oxygen. In uplands: terminal electron acceptors, lots of o2 but not many electron donors, the order in which the reductions are expected to occur, need to use up all the oxygen before you can use the nitrate, etc. Above water table, so oxygen: mottles = iron reduction, manganese mottles (but darker, nitrate = breaking organic matter above it and ammonium. Sulfate: gleyed = iron is reduced so its mobile and that means the other reactions have to be underneath. Confining clay layer: oxygen there because it can diffuse slowly and also there"s no demand for the oxygen, saltwater marsh. Oxygen: salts = sulfates (ocean water has sulfates, bog - no sulfate. Oxygen: faster decomposition because of the warmer temperature and also quality of carbon (usually fresher material is better for bacteria)
