Gaseous Cycles: Nitrogen

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Result of nitrogen and oxygen reaction

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Acid deposition on Earth

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Chemical formula for nitric acid

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HNO₃

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Ammonia (NH₃) and ammonium (NH₄⁺).

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These are forms of nitrogen that result from decomposition and are used by plants and bacteria in the nitrogen cycle.

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Nitrification involves the conversion of ammonia and ammonium salts into nitrites and nitrates.

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Nitrification is a key process in the nitrogen cycle.

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Natural Nitrogen Addition

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Lupines and alder trees naturally add nitrogen to the environment.

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Human impact on the nitrogen cycle

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Humans double the turnover rate of the nitrogen cycle globally, creating the most stressed of all systems.

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Once fixed in the soil, nitrogen is incorporated into plant matter and moves through the food chain.

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Nitrogen is vital for plant growth.

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NH₃ and NH₄ are forms of nitrogen returned to the soil through mineralization.

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These forms are crucial for plant uptake.

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Erosion can remove ammonia adhered to soil particles.

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This can affect the availability of nitrogen for plants.

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Diagram of the Carbon Cycle

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The carbon cycle involves processes such as photosynthesis, respiration, decomposition, and combustion.