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LAKE ECOLOGY Unit 1: Module 2/3 Appendix A – Nitrogen cycle.

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Presentation on theme: "LAKE ECOLOGY Unit 1: Module 2/3 Appendix A – Nitrogen cycle."— Presentation transcript:

1 LAKE ECOLOGY Unit 1: Module 2/3 Appendix A – Nitrogen cycle

2 Developed by: R. Axler Updated: December 2003 U1-m2/3appA-s2 Assimilation (algae + bacteria) Assimilation -3+5+4+3+2+1 0 -2 Oxidation state Assimilation Denitrification NO 2 N2ON2O N2N2 NH 4 + NO 2 - Mineralization Org-N Main N-cycle transformations N 2 - Fixation - Soil bacteria - Cyanobacteria - Industrial activity - Sulfur bacteria Denitrification (anoxic bacteria) Nitrification 1 (oxic bacteria) Nitrification 2NO 3 - Ammonification gases Anammox (anoxic bacteria)

3 Developed by: R. Axler Updated: December 2003 U1-m2/3appA-s3 Surficial Sediments N2N2 Algae oxic anoxic NO 3 - NH 4 + Nitrification Assimilation Mineralization NH 4 + Nitrification NO 2 -, N 2 O NO Denitrification Sedimentation DIN PON DON Sedimentation Deep Sediments Burial Ammonia volatilization Tribs, GW, Precip DON, PON, NO 3 -, NH 4 + NO 3 - Outflow diffusion N 2 -fixation Whole lake N-budget Mixing Mineralization

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