Nitrogen Dynamics
Nitrogen Dynamics
Nitrogen Dynamics
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Aspects of the N Cycle<br />
<br />
Biotic transformations<br />
• Nitrification (NH 3 => NO<br />
- 2 => NO 3- )<br />
– Bacterial oxidation of NH 3(aq<br />
aq)<br />
to nitrate (NO(<br />
3-<br />
)<br />
– Done aerobically<br />
– Nitrosomonas (convert ammonium to nitrite NO 2-<br />
)<br />
– Nitrobacter (convert nitrite NO -<br />
2<br />
to nitrate NO 3-<br />
)<br />
• Assimilatory Nitrate Reduction (NO<br />
- 3 => organic-N, NH 3 or<br />
NH 4+ )<br />
– Nitrate reduced to organic N compounds, ammonia or<br />
ammonium<br />
– Accomplished by green plants, some bacteria, algae
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