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Nat Sci 5 - Phosphorus Cycle

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Pauline Dy

on 9 October 2013

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Transcript of Nat Sci 5 - Phosphorus Cycle

Group 3 - Nat Sci 5
The Phosphorus Cycle
Weathering and Erosion
Decay of Organisms
•Phosphorus enters the ocean through runoff (flow from soil to water) or leaching (extraction of nutrients due to rain or irrigation).

•It cycles between the water and the bodies of organisms.

•It finally deposits in the ocean as sediments.
•Ocean sediments eventually rise in the process called uplifting.

•The cycle once again continues as the sedimentary rocks reach the earth's surface.
Human Disruption:
Mining and fertilizers
Earth's Crust
- main source of phosphorus
• Weathering and erosion releases phosphorus in rocks as phosphates.

• Phosphates enter the soil where it is absorbed by plants.

• Animals eat plants.
•Animal wastes return phosphate to the soil.

•Phosphatizing bacteria break down the remains of dead plants and animals, thus returning phosphate to the soil.

•Plants reabsorb the phosphates.
•Humans mine phosphates for fertilizers.

• Fertilizers enter bodies of water through runoff.

•This results to eutrophication which can cause massive growth of water hyacinths
Unlike the water, carbon, sulfur and nitrogen cycle, phosphorus does not cycle through the atmosphere!
Human Disruption:
Sewage Treatment Plants
Sewage treatment plants add extra phosphorus to lakes, rivers and seas.

Extra phosphorus leads to growth of organisms (such as algae)

When this happens, an imbalance in the ecosystem occurs.
Importance of Phosphorus
Human Disruption:
Products with phosphorus
Essential nutrients for plants (in the form of PO4 3-, HPO4 2-)

Phosphates holds the framework of DNA and RNA

Composes ATP and ADP

Phospholipid bilayer of cells

Building blocks of bones and teeth
• Detergents contribute to significant concentrations of phosphorus in bodies of water

•Causes eutrophication
Images used:

Video used: (Phosphorus Cycle.)

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