Sulfur Cycle

The purpose of this blog is to teach people about how the sulfur cycle works! Emily, Nadine, Vienna, and Claire

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Earth’s Crust

This is our largest physical reservoir.

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Our largest biologically useful reservoir!

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The atmosphere is an inorganic sulfur reservoir.

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This is a simple model of the process of the sulfur cycle and how it is spread through out the earth.

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- Two main organic pathways

- Both release into atmosphere

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- Sulfate from soil taken into plants

- Sulfur return to soil in manure and organic fertilizers

- Desulfurization in decomposition

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Sulfur is released naturally through volcanic eruptions, ocean sea spray, and decomposition. 

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Hydrogen sulfide gas is released through decomposition or organic matter. 

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The increase of human intervention leads to more sulfuric acid, also known as acid rain.

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Sulfur is a key component in Cysteine and Methionine.

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Sulfur dioxide is often produced by point sources such as coal power plants and factories with large furnaces. Fortunately, US SO2 levels have dropped 33% between 1983 and 2002, though in 2005 it was reported that China had risen 27%, to reach levels comparable to the US in 1980.

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Acid rain is associated with large amounts of sulfur dioxide to the atmosphere by human sources.