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The Nitrogen Cycle
Transcript of The Nitrogen Cycle
The Nitrogen Cycle
Roles Played by Organisms in the
"The Relationships between Net Primary Productivity, Human Population Density and Species Conservation." GW Lucky, 5 Sept. 2007. Web. <www.montana.edu/hansen/documents/bio491/luck%202007.pdf>.
"The Ecological Footprint Is an Indicator of Human Pressure on Nature." Human Demand Outstrips Nature's Supply. WWF Global, 2003. Web. <www.panda.org/about_our_earth/aboutcc/cause/polluters/>.
Fields, Scott. "Global Nitrogen: Cycling out of Control." Environ Health Perspect, July 2004. Web. <www.ncbi.nlm.nih.gov.112(10); Jul 2004>.
Nitrogen is one of the primary nutrients critical for the survival of all living organisms.
What is the Nitrogen Cycle?
A Gaseous Cycle
Chemicals Involved in the Nitrogen Cycle
Biological Nitrogen Fixation
Nitrogen (N2) in the atmosphere is converted into ammonia (NH3) by plants.
Atmospheric nitrogen (N2) does not easily react with other chemicals to form new compounds.
Photosynthesis and free living bacteria break up the nitrogen atoms
from their diatomic form (N2) to be used in other ways
78% of Earth's atmosphere is nitrogen
Nitrogen is a component of...
Human Activity Affect on the Nitrogen Cycle
Humans increase the amount of Nitrogen with:
fossil fuel combustion
use of artificial Nitrogen fertilizers
the release of Nitrogen in waste
Affects to the Cycle:
contamination of water
nearly tripling the ammonia in the atmosphere
human respiratory systems can become damaged
SOLUTIONS to Reduce the Amount of Nitrogen in the Environment
1. Become a vegetarian
2. Improve the way farmers
rotate crops and fertilize
Because the Nitrogen Cycle has more than DOUBLED the transfer of nitrogen into biologically available forms annually...
Nitrogen is broken down into ammonia by nitrogen-fixing bacteria to be used by plants
Animals eat plants or plant eating animals
Animals produce waste
Animals and plants die
bacteria converts ammonia into nitrogen gas