phosphorus cycle geochemical cycles continued. objectives: describe the process of cycling...
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Phosphorus Cycle
Geochemical Cycles continued
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Objectives:
Describe the process of cycling phosphorus throughout environment.
Describe the role that fertilizer plays in both the nitrogen and phosphorus cycle.
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What is phosphorus?
• An element [P] that forms molecules that make up the cells of living organisms
• Helps form bones and teeth in animals
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How do organisms get P?
• Plants: get P from soil and water
• Animals: get P from eating the plants
Phosphorus cycle: movement of phosphorus from the environment to organisms and then back to the environment.
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Phosphorus cycle
• Occurs very slowly
• Doesn’t occur in atmosphere because P is rarely a gas.
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How does P get in soil and water? • 1st way: rocks erode and small amounts of P
dissolve in soil and water
• Plants absorb P in the soil through roots
• 2nd way: Excretion, death and decomposition
• 3rd way: washes off the land and into oceans– Phosphate salts-don’t dissolve in water-accumulate at
bottom
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How can too much N or P effect an ecosystem?
• Fertilizers contain both Nitrogen and Phosphorus to stimulate faster plant growth
• What happens when there is an excessive amount of fertilizer used?
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Overuse of fertilizer…• Excess fertilizer can enter
terrestrial and aquatic ecosystems through runoff
• Causes rapid growth of algae-Algal bloom
• Algal blooms can deplete ecosystems of nutrients like oxygen & kill organisms