The Nitrogen Cycle.

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Presentation transcript:

The Nitrogen Cycle

What is nitrogen?

Periodic Table Nitrogen is an element

Where is nitrogen found in the environment?

The largest single source of nitrogen is in the atmosphere. Nitrogen makes up 78% of our air!

What happens to atmospheric nitrogen (N2) in the nitrogen cycle?

Atmospheric nitrogen is converted to ammonia or nitrates. Atmospheric Nitrogen (N2) N N Nitrates (NO3) Nitrogen combines with Oxygen to make Nitrates Ammonia (NH3) Nitrogen combines with Hydrogen to make Ammonia

Why does atmospheric nitrogen need to be converted?

It is one of nature’s great ironies… Nitrogen is an essential component of DNA, RNA, and proteins—the building blocks of life. Although the majority of the air we breathe is nitrogen, most living organisms are unable to use nitrogen as it exists in the atmosphere!

How does atmospheric nitrogen get changed into a form that can be used by most living organisms?

By traveling through one of the three processes in the Nitrogen Cycle! (1) Nitrogen Fixation (3) Denitrification Nitrogen Cycle (2) Nitrification

The first process in the nitrogen cycle is… Nitrogen Fixation!

What is “nitrogen fixation” and what does it mean to say nitrogen gets “fixed”?

“Nitrogen Fixation” is the process that causes the strong two-atom nitrogen molecules found in the atmosphere to break apart so they can combine with other atoms and be used by plants. Nitrogen gets “fixed” when it is combined with oxygen or hydrogen. N N Hydrogen Oxygen Hydrogen N N N N Oxygen

Symbiotic Relationship Bacteria Biological Fixation (where MOST nitrogen fixing is completed) There are two types of “Nitrogen Fixing Bacteria” Free Living Bacteria (“fixes” 30% of N2) Symbiotic Relationship Bacteria (“fixes” 70% of N2)

It travels through the second process of the nitrogen cycle called Nitrification! The conversion of ammonium to nitrites and then nitrates by the bacteria (1) Nitrogen Fixation (2) Nitrification

How does nitrogen reenter the atmosphere in the nitrogen cycle?

Through the third process called denitrification! (1) Nitrogen Fixation (3) Denitrification (2) Nitrification

What does denitrification do?

Denitrification converts nitrates (NO3) in the soil to atmospheric nitrogen (N2) replenishing the atmosphere. Nitrogen in atmosphere (N2) Nitrates (NO3) in Soil

How does the denitrification process work? Nitrates in soil

Ways that nitrogen returns to the atmosphere… Emissions from industrial combustion and gasoline engines create nitrous oxides gas (N2O). Volcano eruptions emit nitrous oxides gas (N2O).