EVSC 4200 Lecture Notes - Lecture 11: Shenandoah National Park, Nitrogen Cycle, Sulfur Dioxide
18 Feb 2016
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Document Summary
The main input of sulfur comes from the erosion of the (cid:1) (cid:1) mountains, or in the lower wetlands, from the ocean. (70-80 years ago) One of the reasons why you have the continuous productivity in the salt marshes is the continuous supply of sulfur. Nearly every environmental law that we have was passed around 1972 during the nixon regime: sulfur enhanced a lot of the other cycles as well. As we get into more reduced conditions, we get manganese and (cid:1) iron that start out in their oxidized form, and then continue to be reduced. Iron and aluminum oxides, silicates, are in their oxidized form and are relatively insoluble. As the environment around them becomes more reducing (more sulfides), but iron and aluminum get into their reduced states. They are soluble in their reduced states, and then once you start to reduce these, you make other compounds able to be reduced and that"s when you get a problem.
