Wetland Biogeochemistry

Wetland Biogeochemistry - Lecture 8 Wetland Biogeochemistry...

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Unformatted text preview: Lecture 8 Wetland Biogeochemistry EVPP/BIOL 350 Freshwater Ecosystems Dr. Kim de Mutsert Fall 2011 Bb Reading: Wetland Biogeochemistry. pp. 177-200 from Wetlands (Mitsch and Gosselink eds.). Wetland Biogeochemistry Wetlands are valuable sources, sinks and transformers of a multitude of chemical materials Wetlands- have shallow water or saturated soils- accumulate organic plant material that decomposes slowly- have unique soil conditions Wetland Biogeochemistry When soils are inundated with water, anaerobic conditions usually result Diffusion through wet soil is drastically reduced There usually is a thin layer of oxidized soil on the soil surface at the soil-water interface Hydroperiod determines the presences and thickness of the oxidized layer Redox reactions The presents of the oxidized layer near reduced soils is important in the chemical transformations and nutrient cycling that occur in wetlands Redox potential is a quantitative measure of the tendency of the soil to oxidize or reduce substances During oxidation , chemicals give up electrons e.g. Fe 2+ Fe 3+ + e- During reduction , chemicals gain electrons e.g. 2NO 3 + 10e- + 12H + N 2 + 6H 2 O AEROBIC REACTION ANAEROBIC REACTION The Nitrogen Cycle Nitrogen is often the most limiting nutrient in flooded soils and coastal wetlands (in lakes this is phosphorus) Because of anoxic conditions in wetlands,...
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Wetland Biogeochemistry - Lecture 8 Wetland Biogeochemistry...

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