CenUSA Bioenergy High School Curriculum Lesson 4

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Presentation transcript:

CenUSA Bioenergy High School Curriculum Lesson 4 Nitrogen Cycle CenUSA Bioenergy High School Curriculum Lesson 4

Introduction to the Nitrogen Cycle Nitrogen is an element. It is found in living things like plants and animals. It is also an important part of non-living things like the air above and the soil below. Atoms of nitrogen don't just stay in one place. They move slowly between living things, dead things, the air, soil and water. These movements are called the nitrogen cycle.

Processes in the Nitrogen Cycle Most plants get the nitrogen they need to grow from the soil or water in which they live. Animals get the nitrogen they need by eating plants or other animals that contain nitrogen. When organisms die, their bodies decompose bringing nitrogen into soil on land or into ocean water. Bacteria alter the nitrogen into a form that plants are able to use. Other types of bacteria are able to change nitrogen dissolved in waterways into a form that allows it to return to the atmosphere.

Changes to Nitrogen Cycle Use of nitrogen-rich fertilizers can add too much nitrogen to nearby waterways as the fertilizer washes into streams and ponds. The waste associated with livestock farming also adds large amounts of nitrogen into soil and water. Increased nitrate levels cause plants to grow rapidly until they use up the supply and die. The number of plant-eating animals will increase when the plant supply increases and then the animals are left without any food when the plants die.

Water Erosion and Leaching of Nitrogen Detachment of earth material from the surface. Water or wind transport the material to a new location where it is deposited. The most common form of erosion is caused by water.