The Nitrogen Cycle The nitrogen cycle - nitrogen circulates among the air, soil, water, plants, and animals in an ecosystem. All organisms need nitrogen.

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Presentation transcript:

The Nitrogen Cycle The nitrogen cycle - nitrogen circulates among the air, soil, water, plants, and animals in an ecosystem. All organisms need nitrogen to build proteins, to build new cells. Nitrogen makes up 78 percent of the gases in the atmosphere.

The Nitrogen Cycle Nitrogen must be altered, or fixed, before organisms can use it. Bacteria known as “nitrogen-fixing” bacteria can fix nitrogen into chemical compounds that can be used by other organisms..

The Nitrogen Cycle Nitrogen-fixing bacteria convert atmospheric nitrogen into ammonia. These bacteria live in the roots of plants called legumes, (beans, peas, and clover). Excess nitrogen is released into the soil.

Legumes

The Nitrogen Cycle Nitrogen can also be fixed in the atmosphere by lightning

The Nitrogen Cycle

Decomposers and the Nitrogen Cycle Nitrogen stored within the bodies of living things is returned to the nitrogen cycle once those organisms die.

Decomposers and the Nitrogen Cycle Decomposers break down decaying plants

Decomposers and the Nitrogen Cycle Decomposers break down decaying animals

Nitrogen Cycle Animals receive their nitrates from eating plants or other organisms

Decomposers and the Nitrogen Cycle Decomposers break down decaying plant & animal waste. Nitrogen goes back into ground and atmosphere

The Nitrogen Cycle