The Nitrogen Cycle Chapter 2.3. What accounts for the differences?

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Presentation transcript:

The Nitrogen Cycle Chapter 2.3

What accounts for the differences?

What is fertilizer?  One of the main ingredients is Nitrogen!  After carbon, hydrogen and oxygen, nitrogen is the most common element found in food chains.  It cycles too!

Plants  Plants use nitrogen (N), potassium (K) and phosphorous (P) to help them grow. These are common elements in fertilizers.  The Earth’s atmosphere is 80% nitrogen gas, but most organisms can’t use the nitrogen directly

Human Impact on the Nitrogen Cycle  Most plants can live very well in low nitrogen environments.  Artificial fertilizers have altered the process.  The burning of fossil fuels in our cars and by factories also emits nitrogen back into the environment.  There is now an additional 140 TONNES of nitrogen in the Earth!

Effects on Soil  There are limits to how much plant growth can be increased by adding more nitrates.  More doesn’t always lead to increased production.  “Nitrogen Saturation”  Damages soil, and tree roots, stunts tree growth, and causes needles on spruce trees and other conifers to turn yellow and fall off.  Increase in soil acidity.

Effects on the Atmosphere  Acid precipitation  Kills fish, birds, amphibians, other organisms.  Loss of sugar maple trees in Ontario and Quebec  Lake pollution  Only solution is to add limestone powder to lakes to neutralize

Effects on fresh-water ecosystems  1970’s huge increase in algae and weeds.  Increased nitrates from fertilizer caused the spike.  Blocks sunlight from entering ecosystems in ponds. Plants can’t perform photosynthesis.

Effects on Marine Ecosystems  Development of Algal blooms.  Robs the ecosystem of oxygen.  Loss in fish and shellfish.

Complete Questions  Page 65 questions 1 to 6  Read 2.4 and complete questions 1 to 4 page 68.  cyc.htm cyc.htm