Decomposition and Nutrient Cycling

Decomposition and Nutrient Cycling - and Biosphere •...

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1/31/11 Decomposition and Nutrient Cycling Different ecosystems cycle nutrients at different rates Depends on rate of decomposition Tropical rain forest – few months to few years Temperate forests – 4 to 6 years Tundra – 50 years Temperature and oxygen play vital roles Tropical rain forests – phosphorus occurs in the soil at levels far below that of a temperate forest why? Nutrients are taken up as soon as they are available
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1/31/11 Human Impact on Ecosystems
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Unformatted text preview: and Biosphere • Disruption of chemical cycles – Depletion of soil nutrients in one area, and excess in another • Food crops – Addition of new toxins to an area • Agricultural effects on nutrient cycling – An area is cleared for farming, and nutrients exist in the soil – The crop is grown, but the nutrients the crop took from the soil is transported elsewhere – Nutrients must be added back to the soil...
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This note was uploaded on 01/30/2011 for the course BIOL 001 taught by Professor Nathan during the Spring '10 term at George Mason.

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Decomposition and Nutrient Cycling - and Biosphere •...

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