Gaseous Cycles: Nitrogen

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Role of Decomposers

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Decomposers convert plant and animal waste and N₂ from air into ammonia (NH₃).

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Nitrogen-Fixing Bacteria

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Bacteria that fix nitrogen in legume root nodules.

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Energy source for chemotropic bacteria

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They consume N₂ to obtain energy for their metabolic processes.

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Role of anaerobic bacteria

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Anaerobic bacteria reverse the nitrification process and convert nitrates back into nitrogen gas.

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Wildflowers that add nitrogen

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Lupines and alder trees

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Eutrophication cause

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Runoff of excess fertilizer causes eutrophication in water.

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Ammonia removal from an ecosystem

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Ammonia can be removed from an ecosystem via soil erosion as it attaches itself to soil. It is also removed when crops are harvested.

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Bacteria release this as CO₂ via cellular respiration.

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After death, bacteria convert carbon into carbon dioxide through cellular respiration.

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Deep water up to 350 years.

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Carbon can stay in deep ocean waters for up to 350 years.

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Image of a coral reef ecosystem.

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Coral reefs are significant carbon reservoirs.