Nitrogen Cycle

1
Nitrogen Cycle

• Ch.2.2

2
Cycles in Nature
3
Energy Flows...

• Flows in one direction
• Will never return to the same form
• Conservation of Energy
• Energy changes form
• But is never lost

4
Matter cycles..

• Matter can be recycled
• Matter can be reformed
• The basic building blocks are reused
• Conservation of Matter

5
Carbon cycle...
6
Tracing the cycling of matter..
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Energy Matter in an Ecosystem
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Bacteria Decomposers in the Nitrogen Cycle
BACTERIA!
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Bacteria as decomposers
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Legumes Root nodules

• Legumes are plants with root nodules
• Fix nitrogen in soil
• Using Bacteria
• Produce usable Nitrate

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Legumes have root nodules
Examples of Legumes beans and peas ?Why do
farmers rotate corn and soy beans every few years?
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Nitrogen Diagram

• B-C Ammonia from waste decomposes to nitrate by
  bacteria (nitrification)
• C-D Nitrate is used as fertilizer by plants
• D-E plant protein nitrogen becomes animal protein
  when eaten

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Nitrogen Diagram

• E-B Animal protein waste decomposes to ammonia by
  bacteria
• F-C Nitrogen gas is fixed by lightning to nitrate
  in the soil (Nitrogen fixation)

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IV. Nitrogen cycle

• Plants only use nitrate
• Muscle tissue is made of amino acids
• Decomposition of protein makes ammonia
• Ammonia converts to nitrite
• Nitrite converts to nitrate

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V. Nitrogen Cycle

• Nitrification ammonia to nitrite to nitrate by
  bacteria in the soil
• Denitrification nitrate to nitrogen gas by
  bacteria
• Decompostion ammonia in wastes to nitrite by
  bacteria
• Nitrogen fixation nitrogen gas to nitrate by
  lightning or nitrite by plant/ bacteria