Biogeochemical cyclesBiogeochemical cycles & · PDF fileBiogeochemical cyclesBiogeochemical...
Transcript of Biogeochemical cyclesBiogeochemical cycles & · PDF fileBiogeochemical cyclesBiogeochemical...
Biogeochemical cyclesBiogeochemical cycles& Mineralisation
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Elemental cycles: C, N, S, P, Fe, Mn
Biomass substitute for oil
Fig. 27.1 Macrobiogeochemistryg g y
Fi 27 2 C b lFig. 27.2 Carbon cycle
Fig. 27.3Influence of oxygen on degradation of organic matter.
Fig. 27.4 Nitrogen cycle
Nodules on the roots of Legume plantg p
Rhizobium species live in the nodules fi N D d hi bi Nto fix N2. Dead rhizobia are N-source
for plant to synthesize amino acids.
N2 + 3H2 → 2 NH3
Nitrogenase, ATP, Mo, Fe165 · 106 ton N/yr
Haber-Bosch process:p40 · 106 ton N/yr
Biological nitrogen fixationg g• Symbiotic kg N/ha·yr
h bRhizobium 20 – 500clover, sojabeans, pea, luzern
Actinomyceter 40 – 500yalder, buckthorn, myrtle, avens
• Non-symbioticAzotobacter Clostridium 0 2Azotobacter, Clostridium 0.2Bluegreen algae 10 - 20
Fig 27 6 Sulfur cycleFig. 27.6 Sulfur cycle
Fig. 27.5 Phosphorus cycle
Fig. 27.7 Fe cycle
Fig 27 8 Manganese cycleFig. 27.8 Manganese cycle
Fig. 27.9 The Mercury cycle
Fig. 27.10 Microenvironments
Role of microorganisms in flow of organic carbon and CO2