SCI 256 Biogeochemical Cycle(Nitrogen cycle) WeeKII

8/7/2019 SCI 256 Biogeochemical Cycle(Nitrogen cycle) WeeKII

http://slidepdf.com/reader/full/sci-256-biogeochemical-cyclenitrogen-cycle-weekii 1/12

SCI/256IRYNA SANDERS

Kim ScottUniversity of Phoenix



NITROGEN CYCLETHE ATMOSPHERE

PLANTS

ANIMALS

THE OCEAN AND FRESHWATER

CLIMATE SYSTEM



In all biogeochemical cycles organic material is

converted to inorganic material through various

processes. The nitrogen cycle is a complex

biological cycle involving recycling of usable

nitrogen. If the nitrogen cycle cease, all forms of life on the earth would DIE. What is the nitrogen

cycle the audiences may ask, let s discuss.



NITROGEN

Earth atmosphereis 79 percent nitrogen

Change globaltemperatures

Emissions of nitrousoxide N2O or N3O

Understandingglobal fluxes



ATMOSPHERE LIFE

AmmonificationNitrification

Assimilation



B iologicallyuseful forms of

nitrogenPlants in saltwater

Fertilization of thesoil for plants



Decomposing animalremains and animalwastes

Animals that eatplants

The ammonia mayleave the soil

Nitrosomonas oxidize



Ocean amountof nitrogen uncertainties

Relatively few studies

Freshwater most activeNitrogen cycling



Fertilizers application,have more than doubled

Assess the possibilities of nitrogen management

Scientific communitydoes not yet have anintegratedunderstanding



Looking at the plants system, animals system,

water system and the climate, the nitrogen cycle is

essential to the existence of all four systems.

Nitrogen is the most abundant element in the

atmosphere. If human beings continue the misuseof nitrogen the earth is

DOME





Hansen, J., Refsgaard, J., Ernstsen, V., Hansen, S., Styczen, M., & Poulsen, R. (2009). An integrated andphysically based nitrogen cycle catchment model. Hydrology Research , 40(4), 347-363.doi:10.2166/nh.2009.035.retrieved on January 21, 2010

http://search.ebscohost.com/login.aspx?direct=true&db=a9h&AN=45730214&site=ehost-liveGruber, N., & Galloway, J. (2008). An Earth-system perspective of the global nitrogen cycle. Nature ,

451 (7176), 293-296. doi:10.1038/nature06592.http://search.ebscohost.com/login.aspx?direct=true&db=a9h&AN=28457124&site=ehost-liveHansen, J., Refsgaard, J., Ernstsen, V., Hansen, S., Styczen, M., & Poulsen, R. (2009). An integrated and

physically based nitrogen cycle catchment model. Hydrology Research , 40(4), 347-363.doi:10.2166/nh.2009.035.

http://search.ebscohost.com/login.aspx?direct=true&db=a9h&AN=45730214&site=ehost-liveImages from Google.comhttp://images.google.com/images?hl=en&source=hp&q=nitrogen+cycle&btnG=Search+Images&gbv=2Robertson, G. (1986). NITROGEN Regional Contributions to the Global Cycle. Environment , 28 (10), 16-29.

retrieved January 21, 2010 from Academic Search Complete databasehttp://web.ebscohost.com/ehost/detail?vid=12&hid=113&sid=35111e36-ac00-4d80-8230-

c698c09dfc0e%40sessionmgr111&bdata=JnNpdGU9ZWhvc3QtbGl2ZQ%3d%3d#db=a9h&AN=8600009299

Scientists at Climate Talks Say Major Changes to the Nitrogen Cycle Cannot Be IgnoredScienceDaily ( Dec. 8, 2009) retrieved January 21, 2010 from the Internethttp://www.sciencedaily.com/releases/2009/12/091206183705.htm

Images from Google.com retrieved January 22, 2010 from the Internet

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SCI 256 Biogeochemical Cycle(Nitrogen cycle) WeeKII