Download - Biogeochemical Cycles
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Biogeochemical Cycles
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Nitrogen Cycle
Nitrogen is needed by all organisms for cell-building.
Atmospheric nitrogen (N2) is inert and needs to be changed into more reactive forms.
Reactive forms of nitrogen: ammonium (NH4
+), nitrates (NO3-)
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Nitrogen Cycle
Processes:1. Nitrogen fixation
2. Nitrogen uptake or assimilation
3. Decomposition
4. Nitrification
5. Denitrification
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Nitrogen Cycle
Human Activities1. Using synthetic nitrogen fertilizers
Increased agricultural production Contamination of groundwater Algal blooms Fish kills
2. Burning fossil fuels Air pollution Acid rain Global warming
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Let’s Review
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Let’s Review
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Carbon dioxide - Oxygen Cycle
CO2 is needed by plants in photosynthesis (making food) and is a greenhouse gas.
O2 is needed by organisms in respiration (getting energy from food).
Processes:1. Photosynthesis
2. Respiration
3. Combustion
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Carbon dioxide-Oxygen Cycle
1. Photosynthesis the process by which plants make food
(glucose) CO2 + H2O sunlight C6H12O6 + O2
releases O2 into the air
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Carbon dioxide-Oxygen Cycle
2. Respiration the process by which living things get energy
by “burning” food C6H12O6 + O2 CO2 + H2O + energy
releases CO2 into the air
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Carbon dioxide-Oxygen Cycle
3. Combustion the process by which fuels are burned to
release energy (heat) fuel + O2 CO2 + heat
releases CO2 into the air
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Carbon dioxide - Oxygen Cycle
Human Activities1. Deforestation
Increased CO2 global warming
Decreased O2
2. Burning fossil fuels Increased CO2 global warming Air pollution
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The End