Chapter 5: The Biogeochemical Cycles
Chapter 5: The Biogeochemical Cycles
Chapter 5: The Biogeochemical Cycles
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<strong>The</strong> Phosphorus Cycle<br />
• Enters biota through uptake as phosphate by<br />
plants, algae and some bacteria.<br />
– Returns to soil when plants die or is lost to oceans via<br />
runoff<br />
– Returned to land via ocean feeding birds (guano)<br />
• Guano deposits are a major source of P for<br />
chemical fertilizers (<strong>The</strong>y are present in<br />
geologically large quantities in Chile and a few<br />
other deposits in the world.)
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