The Nitrogen Cycle

The Nitrogen Cycle, not including human influences.

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  • Created by: Rhi_
  • Created on: 17-04-14 20:05
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  • Nitrogen in plants proteins, amino acids, DNA
    • Eaten
      • Nitrogen in animals proteins, amino acids, DNA
        • Death and excretion (urea, uric acid)
          • Dead organic matter
            • Ammonification
              • (the decomposition by detritivores and decomposers)
              • Ammonium ions NH4+
                • Oxidation by bacteria e.g. Nitrosomonas
                  • Nitrate ions NO2-
                    • Oxidation by bacteria e.g. Nitrobacter
                      • Nitrate ions NO3-
                        • Root absoption
                          • Nitrogen in plants proteins, amino acids, DNA
                            • Eaten
                              • Nitrogen in animals proteins, amino acids, DNA
                                • Death and excretion (urea, uric acid)
                                  • Dead organic matter
                                    • Ammonification
                                      • (the decomposition by detritivores and decomposers)
                                      • Ammonium ions NH4+
                                        • Oxidation by bacteria e.g. Nitrosomonas
                                          • Nitrate ions NO2-
                                            • Oxidation by bacteria e.g. Nitrobacter
                                              • Nitrate ions NO3-
                                                • Root absoption
                                                  • Denitrifying bacteria e.g. Pseudomonas. Nitrates chemically reduced to N2
                                                    • Atmospheric nitrogen N2
                                                      • Ionising processes e.g. lightning. (N2+O2=NOX)
                                                        • Nitrogen fixation by root nodule bacteria e.g. Rhizobium on roots of legumes
                                                          • Nitrogen fixation by nitrifying bacteria
                                                            • Nitrogen fixation by nitrifying bacteria
                                • Denitrifying bacteria e.g. Pseudomonas. Nitrates chemically reduced to N2
                                  • Atmospheric nitrogen N2
                                    • Ionising processes e.g. lightning. (N2+O2=NOX)
                                      • Nitrogen fixation by root nodule bacteria e.g. Rhizobium on roots of legumes
                                        • Nitrogen fixation by nitrifying bacteria
                                          • Nitrogen fixation by nitrifying bacteria
                • Death and leaf fall
                • Key:
                • Red boxes - nitrogen stores
                • Blue boxes - nitrogen processes that allow them to move between stores
                • The Nitrogen Cycle (not including human influences)

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