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Nitrogen Cycle

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JKE Drequi

on 31 October 2012

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Transcript of Nitrogen Cycle

The Cycle As a compound and an element Environmental Issues Nitrogen as a nutrient The Nitrogen Cycle By: Jen Crockett and Marie Gjerde Burning fossil fuels, using nitrogen-based fertilizers, and other activities can dramatically increase the amount of nitrogen in an ecosystem. Industrial nitrogen fixation has increased exponentially since the 1940s, and human activity has doubled the amount of global nitrogen fixation (Vitousek et al. 1997).
In terrestrial ecosystems, the addition of nitrogen can lead to nutrient imbalance in trees, changes in forest health, and declines in biodiversity. With increased nitrogen availability there is often a change in carbon storage, thus impacting more processes than just the nitrogen cycle.
Much of the nitrogen applied to agricultural and urban areas ultimately enters rivers and near shore coastal systems.
In near shore marine systems, increases in nitrogen can often lead to no or low oxygen, altered biodiversity, changes in food-web structure, and general habitat degradation. One common consequence of increased nitrogen is an increase in harmful algal blooms (Howarth 2008). Increases in nitrogen in aquatic systems can also lead to increased acidification in freshwater areas. The Human Impact The use of fertilizers that contain nitrogen contribute to the lower ozone layer by releasing fixed-nitrogen gases. This reactive nitrogen can also lead to production of aerosols that can induce serious respiratory illness, cancer, and cardiac disease when in the air we breathe. Another pollution problem, acid rain, is fueled in part by nitrogen oxides from fertilizer.
Fixed nitrogen compounds play a role in over-enriching aquatic ecosystems, producing large amounts of phytoplankton that deplete oxygen supplies in the water and lead to dead zones. Bibliography "Manage the Nitrogen Cycle." NAE Grand Challenges for Engineering. National Academy of Engineering, 2012. Web. 23 Oct. 2012. <http://www.engineeringchallenges.org/cms/8996/9132.aspx>.
Bernhard, Anne. "The Nitrogen Cycle: Processes, Players, and Human Impact." Nature.com. Nature Publishing Group, 2012. Web. 23 Oct. 2012. <http://www.nature.com/scitable/knowledge/library/the-nitrogen-cycle-processes-players-and-human-15644632>.
"The Nitrogen Cycle." The Nitrogen Cycle. N.p., 23 Feb. 2011. Web. 23 Oct. 2012. <http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/N/NitrogenCycle.html>.
"Nitrogen Cycle." Wikipedia. Wikimedia Foundation, 22 Oct. 2012. Web. 23 Oct. 2012. <http://en.wikipedia.org/wiki/Nitrogen_cycle>.
Galloway, James, Allison Leach, Albert Bleaker, Jan W. Erisman, and Richard Kohn. "Background Information." N-Print. International Nitrogen Initiative Project, 2011. Web. 25 Oct. 2012. <http://www.n-print.org/node/31>.
http://www.elmhurst.edu/~chm/vchembook/193nox.html •7 protons
•7 neutrons
•7 electrons

•Primary nutrient for plants
•If there was less nitrogen and more oxygen in the atmosphere, then the dryness of the air would become •It Changes through every stage
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