Nitrogen Cycle by Wenying
Nitrogen Cycle:
*Processes
*Cycle as a whole
Nitrogen Gas molecules are released into the atmosphere through Fossil Fuel Emissions. It is dissolved in clouds or water vapour which falls back to Earth as Precipitation. From The Gaseous Atmospheric Nitrogen Store, Nitrogen undergoes 2 processes: 1) Lightning Fixation, 2) Bacteria Fixation. Nitrogen is then ‘absorbed’ into 1) Organic Matter and 2) Fertilizers.
1) Organic Matter: First Nitrogen undergoes Mineralization and bonds with Hydrogen Atoms, to form Ammonium (NH4). Through a process called Nitrification, Ammonium molecules are broken apart to combine with oxygen atoms in the air, forming Nitrites (NO2) then Nitrates (NO3), which dissolves in rain and falls back to Earth.
2) Fertilizers: Nitrogen absorbed in the soil in plants will undergo Leaching, where the nitrogen compounds are moved from one place to another without a change in its compound structure. Eutrophication is where Nitrogen will end up as nutrients in water bodies (eg.
Nitrates that have fall back onto Earth would either 1) be consumed by plants or 2) Through Denitrification, be returned to the atmosphere as Gaseous Losses (N2 & N2O)
posted by IS2104_blog_jh403 @ 07:46
2 Comments
2 Comments:
Denitrification in definition means what ah? Mmm, well the carbon cycle is quite different isn't it. Oh and what's the difference between NO2 and NO3?? o.o Oh no I'm dead for geog. :/
Hello!
This is the definition of Denitrification:
- From Dictionary.com
De·ni·tri·fy (dē-nī'trə-fī')
1.To remove nitrogen or nitrogen groups from (a compound).
2.To reduce (nitrates or nitrites) to nitrogen-containing gases, as by bacterial action on soil.
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Yes, the carbon cycle is quite different from the Nitrogen Cycle. These differences are as below:
In the Carbon Cycle:
There are three stores u have to note.
1- Atmospheric CO2 store
2-
3- Lithosphere CO2 store
Processess like:
1- (Atmospheric CO2 store-) : Diffusion
2- (Biosphere CO2 store-) :
(CO2 intake)Photosynthesis,
(CO2 Output)Respiration, Decomposition, Deforestation.
3- (Lithosphere CO2 store-)
Building up of pressure underground. (So that fossil fuels can be formed)
*I'm speculating about the third point.. but you can research on it to see if I'm right (:*
In the Nitrogen Cycle:
1- Atmospheric N2 Store
Processess involved are like:
1-
Fixation of Bacteria and Lightning,
Surface Runoff and Leaching by nitrogen compunds present in fertilizers,
Mineralization to form Ammonium,
Nitrification to form other Nitrogen compounds,
Denitrification to break Nitrogen compounds for plant comsumption or to be lost as N2/N2O gas.
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NO2 = Nitrites
NO3 = Nitrates
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You're not dead for Geog yet, haha! C:
Did I answer to your question correctly?
-Wenying.
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