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biogeochemical cycle

envs 102 exam 2 review

TermDefinition
biogeochemical cycles describe the movement of matter through reservoirs in the lithosphere, biosphere, hydrosphere, and atmosphere
why is oxygen important? it is found in all spheres, and many organisms rely on it to sustain life via respiration and blood circulation
why is phosphorous important? needed for living things to keep themselves alive - forms nucleic acids, such as DNA, RNA, ATP
why is nitrogen important? needed to sustain life - found in proteins and nucleic acids
why is carbon important? the primary component of organic molecules and the backbone for living things - needed for carbohydrates, lipids, nucleic acids and proteins
carbon cycle stocks: atmosphere, biosphere, hydrosphere, lithosphere, and fossil fuels flows: photosynthesis, respiration, deforestation, acidification, volcanic eruption, sediment accumulation, decomposition, fossil fuel burning, mining, soil compaction
nitrogen cycle stocks: atmosphere, biosphere (also hydrsophere) flows: nitrogen fixation (N2-->NH3), nitrification (NH3-->NO3), denitrification (NO3-->N2), decomposition, soil uptake, assimilation
Haber-Bosch Process creates artificial nitrogen for fertilizer (NH4)
nitrogen forms ___% of atmosphere 78%
nitrogen fixation N2-->NH3 bacteria: bacillus, clostridium, rhizobium, azotobacter
nitrification NH3-->complex compounds, ie NO2, NO3 bacteria: nitrosomonas, nitrobacter
denitrification NO3-->N2 bacteria: pseudomonas, denitrificans
phosphorous cycle stocks: lithosphere, biosphere, hydrosphere, underground reserves flows: fertilizer runoff, weathering, geological uplift, sediment formation, leaching, plant and animal uptake, decomposition
Created by: mcarson29
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