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The Nitrogen Cycle. FACTS 1.Most abundant element in the atmosphere (78%) 2.Required for proteins and nucleic acids 3.Limiting nutrient for producers.

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Presentation on theme: "The Nitrogen Cycle. FACTS 1.Most abundant element in the atmosphere (78%) 2.Required for proteins and nucleic acids 3.Limiting nutrient for producers."— Presentation transcript:

1 The Nitrogen Cycle

2 FACTS 1.Most abundant element in the atmosphere (78%) 2.Required for proteins and nucleic acids 3.Limiting nutrient for producers  added to fertilizers 4.Legume Plants (symbiotic relationship between nitrogen fixing bacteria and roots of legumes)  first successional species because they provide nitrogen to other plants

3 Processes 1.Nitrogen fixation (air to soil) a)Biological- bacteria live on roots of legumes b)Geochemical- atmospheric fixation (lightening) 2.Nitrification (usable form of nitrogen)- nitrifying bacteria convert ammonia to nitrite and then to nitrate 3.Assimilation (picked up) a)producers take up nitrogen from soil through roots b)Consumers take in nitrogen by eating

4 Processes 4.Ammonification (thrown out)- a)decomposers break down dead matter b)Animal waste 5.Denitrification (soil to air)- denitrifying bacteria convert nitrate to atmospheric nitrogen

5 Human Impacts Use of inorganic fertilizers --- Increase in atmospheric nitrogen= acid rain Loss of biodiversity Eutrophication (nutrification of waters)---algae bloom--- death---decomposition---decomposers deplete the oxygen= zone of hypoxia

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