Nitrogen cycle
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9 Terms
What is the nitrogen cycle?
The nitrogen cycle is the process by which nitrogen is converted between its various chemical forms in the environment.
What is nitrogen fixation?
Nitrogen fixation is the conversion of atmospheric nitrogen (N2) into ammonia (NH3) by bacteria in the soil.
What is nitrification?
Nitrification is the biological process by which ammonia is transformed into nitrites (NO2-) and then into nitrates (NO3-).
What is denitrification?
Denitrification is the process by which nitrates are reduced to nitrogen gas (N2) and released back into the atmosphere.
What organisms are responsible for nitrogen fixation?
Nitrogen-fixing bacteria, such as Rhizobium, are responsible for nitrogen fixation.
What is ammonification?
Ammonification is the process by which organic nitrogen from decomposed organisms is converted back into ammonia.
Why is the nitrogen cycle important?
The nitrogen cycle is important because it is essential for the growth of plants and the overall functioning of ecosystems.
How do humans impact the nitrogen cycle?
Humans impact the nitrogen cycle through the use of fertilizers, fossil fuel combustion, and land use changes, leading to increased nitrogen levels in ecosystems.