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Phosphorus Cycle• Q: What is the phosphorus cycle?• A: The phosphorus cycle is the
movement of phosphorus from the environment to organisms and then back to the environment.
• Q: Where is phosphorus found?• A: Phosphorus is mainly found in soil
and rocks.• Q: Why is phosphorus important to life?• A: Phosphorus is in our DNA, bones and
teeth.
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Phosphorus Cycle
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Erosion: 1Runoff: 2 Plants absorb through soil: 2 1/2Consumption: 3Decomposition: 4
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Phosphorus Cycle• Plants absorb phosphates through the soil• Animals absorb phosphates by eating plants or
plant-eating animals.• When animals and plants die, phosphates will
return to the soils or oceans again during decomposition.
• After that, phosphorus will end up in sediments or rock formations again, remaining there for millions of years.
• Eventually, phosphorus is released again through weathering and the cycle starts over.
• Phosphorus is never in the atmosphere.
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Human Impacts on the Phosphorus Cycle• Like nitrogen, increased use of fertilizers increases
phosphorus runoff into our waterways and contributes to eutrophication.
• Eutrophication: a process where water bodies receive excess (too much) nutrients that cause excessive (too much) plant growth.
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What’s important1. Most phosphorus is found in rocks and soil.2. Phosphorus is in our DNA and bones and
teeth.3. Excess phosphorus contributes to
eutrophication (too much plant growth).