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Nutrient Cycles. Carbon Cycle. Image: fig.cox.miami.edu . Carbon Cycle. CarbonCycle Animation Tutorial 58.2 The Global Carbon Cycle Animation The Carbon Cycle Game This would make a nice simulation!. Global Warming Mini Video. http://www.ecobridge.org/video/Quicktime/256.mov. - PowerPoint PPT Presentation
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Nutrient Cycles
Carbon Cycle
Image: fig.cox.miami.edu
Carbon Cycle
• CarbonCycle Animation
• Tutorial 58.2 The Global Carbon CycleAnimation
The Carbon Cycle Game This would make a nice simulation!
Global Warming Mini Video
• http://www.ecobridge.org/video/Quicktime/256.mov
Nitrogen Cycle
• Why do we need nitrogen?
• For DNA, RNA, Proteins
Where does Nitrogen Come From?
• Five main processes cycle nitrogen through the biosphere, atmosphere, and geosphere:
• 1. nitrogen fixation• 2. nitrogen uptake (organism growth) • 3. nitrogen mineralization (decay) • 4. nitrification• 5. denitrification
1. Nitrogen Fixing: Changing unusable nitrogen into usable
nitrogenN2 NH4+
N2 is converted to ammonium, Essential because it is the only way that organisms can attain nitrogen directly from the atmosphere
ONLY DONE WITHNITROGEN FIXING BACTERIA.
Legume Nodules
• nodules of Rhizobium, bacteria that can fix atmospheric nitrogen.
• UGLY – BUT NEEDED!!!
Nitrogen Fixing Bacteria
2. Uptake by Organisms
• Clover is a low cost source of nitrogen.
Urine, fertilizer add nitrogen
3. Nitrogen Mineralization (Decay)
• Microbes eat the decomposed organisms. There is too much nitrogen for them, so they give off nitrogen as ammonia NH3.
Nitrogen Cycle
4. Nitrification
5. Denitrification
• Nitrogen Cycle Animation
WATCH THE MOVING DOTS
Nitrogen cycle
• Fixation of atmospheric nitrogen, N2
• - electrical discharge, chemical production, biological fixation
• NO3 plants animals death & wastes
• Waste org. N decomposers NH3
• NH3 nitrifiers NO2 & NO3
• NO2 & NO3 denitrifiers N2
Animation
• Tutorial 58.4 The Global Nitrogen Cycle
Phosphorus Cycle
• Phosphorus does not enter the atmosphere in its cycle
• Phosphorus remains mostly in rocks and ocean sediments
• Phosphate is found in DNA and RNA (all living things)
Phosphorus Cycle Animation
• Animation