"CHONPS"
system/model

Nutrient,
Element
Biological
Form
Abiotic Reservoir for
Human Ecosystem
Largest Planetary
Reservoir
Human Flux to the
Natural Cycle
Carbon C all Organic Compounds
all Biopolymers
CO2 in Atmosphere
720x109 mTons
Lithosphere CaCO3
1x1017 mTons
Atm. CO2 incr.
1% 308x109 mTon/yr
Nitrogen N Proteins, DNA, other N2 Soil (Atmosphere)
4x1015 mTons
Lithosphere
2x1017 mTons
N fixation & burning
4.2% 3.1x107 mTons/yr
Phosphorus P DNA, ATP,
cell membranes
Lithosphere
2x1016 mTons
Lithosphere
2x1016 mTons
Mining, fertilizer
8.8% 5.7x108 mTons/yr
Sulfur S Amino Acids Lithosphere
4x109 mTons
Lithosphere
4x109 mTons
Mining fertl., & fossil fuels
17% 7x108 mTons/yr
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Biogeochemical *cycles--types



      • Nutrients are included in these cycles: (C,H,O,N,P,S)

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      Which is the largest reservoir?
      What is the human impact ?


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      Bacteria Rule! the Nitrogen Cycle
      Which is the largest reservoir?
      How large is the human impact ?


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      Direct human use of largest
        reservoirs: P & S
      How large is the human impact ?


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      How large is the human impact ?


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LIMITING NUTRIENTS

        Leibig's Law of the Minimum

        Q. Why is N commonly a limiting nutrient in terrestrial ecosystems?

        A. Ammonium and nitrate ions are highly soluble in water and easily leached from the soil


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