2. Abiotic- NutrientCycles
Abiotic – Non-living components essential to all environments.
Water cycle
carbon cycle
nitrogen cycle
phosphorous

4. Nitrogen Cycle

5. Nitrogen Fixation
Nitrogen Fixation -organisms convert gas into useable form.
The Reaction
N2 + 3 H NH3
NH3 is ammonia

6. Ammonification – bacteria and fungi producing ammonia.

7. Nitrogen gas in atmosphere
Nitrites and Nitrates
Ammonia

8. Denitrification – puts Nitrogen back into the air

9. Plants can NOT use N2 from the air
Plants need Nitrogen for:
1. Protein
2. Chlorophyll
What percent of the atmosphere is Nitrogen gas?
78%
Plants can NOT use N2 from the air

10. PHOSPHOROUS CYCLE (not in the air)
Limiting Nutrient – a substance required by organisms and without them they will not grow and develop.
Import for making DNA and ATP

11. Sources of phosphates Cow manure Yard / crop fertilizers
Soaps and detergents
Sewage treatment plants

12. Carbon Cycle
CO2 in
Atmosphere
CO2 in Ocean

13. Increasing atmospheric CO2 levels as measured in the atmosphere and ice cores The amount of net carbon increase in the atmosphere, compared to carbon emissions from burning fossil fuel.

14. That’s it, any questions?
Homework: Read the excerpt from “ A Sand County Almanac” and diagram two cycles of “X.”
Use RED arrows to indicate the flow of X
and BLUE arrows to indicate the flow of energy.