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Aquatic Plants and the Environment (SWES, ECOL, WFSc 474/574). Nutrient Cycles in Wetlands Dr. Kevin Fitzsimmons Professor – University of Arizona. Carbon Cycle. digestion and respiration + 3O 2. Photosynthesis. C 6 H 12 O 6. 6 H 2 O + 6 CO 2. C 6 H 12 O 6 + 3O 2.

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aquatic plants and the environment swes ecol wfsc 474 574

Aquatic Plants and the Environment(SWES, ECOL, WFSc 474/574)

Nutrient Cycles in Wetlands

Dr. Kevin Fitzsimmons

Professor – University of Arizona

carbon cycle
Carbon Cycle

digestion and respiration + 3O2

Photosynthesis

C6H12O6

6 H2O + 6 CO2

C6H12O6 + 3O2

sugars andother organics and oxygen

sugars andother organics

water and

carbon dioxide

anaerobes, fermentation, andmethanogens

CH3CH2OCOOH (lactic acid)other acids (humic and tannic)

CH4 + COx

carbonate cycle
Carbonate Cycle

CO2 + H2O

H2CO3

H+ + HCO3-

H+ + CO32-

carbon dioxidedissolved in water

carbonic acid

bicarbonateion

carbonateion

nitrogen cycle
Nitrogen cycle
  • Nitrogen is often a limiting element in freshwater aquatic system
  • Adding nitrogen will cause rapid increase in primary productivity
  • Nitrogen in anaerobic sediments- denitrification (reduction to NH3 or N2 gas)
phosphorus cycle

Phosphorus and orthophosphate.

Organic P decomposes and releases PO4, taken up by algae and plants or adsorbs to clay particles and precipitates. Anaerobic conditions can re-release P to water.

Phosphorus cycle
sulphur cycle
Sulphur cycle

Organic sulphur, digestedto sulphates, thenreduced

to sulphur dioxide,elemental sulphuror hydrogen sulfide

saturated soils
Saturated Soils
  • Bacteria decompose organics, quickly use available DO
  • Anaerobic conditions, anaerobes scavenge O release H+
  • Reducing conditions
  • Redox reactions in sediments / soils