Nitrogen cycle

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Schematic representation of the flow of Nitrogen through the environment. The importance of bacteria in the cycle is immediately recognized as being a key element in the cycle, providing different forms of nitrogen compounds assimilable by higher organisms. See Martinus Beijerinck.

The nitrogen cycle is the biogeochemical cycle that describes the transformations of nitrogen and nitrogen-containing compounds in nature.

[edit] The Basics

Earth's atmosphere is about 78% nitrogen, making it the largest pool of nitrogen. Nitrogen is essential for many biological processes; it is in all amino acids, is incorporated into proteins, and is present in the bases that make up nucleic acids, such as DNA and RNA. In plants, much of the nitrogen is used in chlorophyll molecules which are essential for photosynthesis and further growth (Smil, 2000).

Processing, or fixation, is necessary to convert gaseous nitrogen into forms usable by living organisms. Some fixation occurs in lightning strikes, but most fixation is done by free-living or symbiotic bacteria. These bacteria have the nitrogenase enzyme that combines gaseous nitrogen with hydrogen to produce ammonia, which is then further converted by the bacteria to make its own organic compounds. Some nitrogen fixing bacteria, such as Rhizobium, live in the root nodules of legumes (such as peas or beans). Here they form a mutualistic relationship with the plant, producing ammonia in exchange for carbohydrates. Nutrient-poor soils can be planted with legumes to enrich them with nitrogen. A few other plants can form such symbioses.

Other plants get nitrogen from the soil by absorption at their roots in the form of either nitrate ions or ammonium ions. All nitrogen obtained by animals can be traced back to the eating of plants at some stage of the food chain.

[edit] Ammonia

The source of ammonia is the decomposition of dead organic matter by bacteria called decomposers, which produce ammonium ions (NH₄⁺). In well-oxygenated soil, these ions are then oxygenated first by nitrifying bacteria into nitrite (NO₂^-) and then into nitrate (NO₃^-). This two-step conversion of ammonium into nitrate is called nitrification (Smil, 2000).

Ammonium ions readily bind to soils, especially to humic substances and clays. Nitrate and nitrite ions, due to their negative electric charge, bind less readily since there are less positively charged ion-exchange sites (mostly humic substances) in soil than negative. After rain or irrigation, leaching (the removal of soluble ions, such as nitrate and nitrite) into groundwater can occur. Elevated nitrate in groundwater is a concern for drinking water use because nitrate can interfere with blood-oxygen levels in infants and cause methemoglobinemia or blue-baby syndrome (Vitousek et al, 1997). Where groundwater recharges stream flow, nitrate-enriched groundwater can contribute to eutrophication, a process leading to high algal, especially blue-green algal populations and the death of aquatic life due to excessive demand for oxygen. While not directly toxic to fish life like ammonia, nitrate can have indirect effects on fish if it contributes to this eutrophication. Nitrogen has contributed to severe eutrophication problems in some water bodies. As of 2006, the application of nitrogen fertilizer is being increasingly controlled in Britain and the United States. This is occurring along the same lines as control of phosphorus fertilizer, restriction of which is normally considered essential to the recovery of eutrophied waterbodies.

Ammonia is highly toxic to fish life and the water discharge level of ammonia from wastewater treatment plants must often be closely monitored. To prevent loss of fish, nitrification prior to discharge is often desirable. Land application can be an attractive alternative to the mechanical aeration needed for nitrification.

During anaerobic (low oxygen) conditions, denitrification by bacteria occurs. This results in nitrates being converted to nitrogen gas and returned to the atmosphere. Nitrate can also be reduced to nitrite and subsequently combine with ammonium in the anammox process, which also results in the production of dinitrogen gas.

[edit] Processes of the Nitrogen Cycle

[edit] Nitrogen Fixation

Main article: Nitrogen fixation

[edit] Conversion of N₂

There are four ways to convert N₂ (atmospheric nitrogen gas) into more chemically reactive forms (Smil, 2000):

The conversion of dinitrogen (N₂) from the atmosphere into a form readily available to plants and hence to animals and humans. This is an important step in the terrestrial nitrogen cycle:

1. Biological fixation: some symbiotic bacteria (most often associated with leguminous plants) and some free-living bacteria are able to fix nitrogen and assimilate it as organic nitrogen. An example of mutualistic nitrogen fixing bacteria are the Rhizobium bacteria, which live in plant root nodes. These species are diazotrophs. An example of the free-living bacteria is Azotobacter.
2. Industrial N-fixation ; in the Haber-Bosch process, N₂ is converted together with hydrogen gas (H₂) into ammonia (NH₃) fertilizer.
3. Combustion of fossil fuels : automobile engines and thermal power plants, which release NOx.
4. Other processes : Additionally, the formation of NO from N₂ and O₂ due to photons and lightning, are important for atmospheric chemistry, but not for terrestrial or aquatic nitrogen turnover.

As a result of extensive cultivation of legumes (particularly soy, alfalfa, and clover), use of the Haber-Bosch process in the creation of chemical fertilizers and pollution emitted by vehicles and industrial plants, human beings have more than doubled the annual transfer of nitrogen into a biologically available form (Vitousek et al, 1997). This has occurred to the detriment of aquatic and wetland habitats through eutrophication.

[edit] Assimilation

In plants which have a mutualistic relationship with Rhizobium, some nitrogen is assimilated in the form of ammonium ions from the nodules. All plants however, can absorb nitrate from the soil via their root hairs. These are then reduced to nitrite ions and then ammonium ions for incorporation into amino acids, and hence protein, which forms part of the plants or animals that eat them (Smil, 2000).this is very essential

[edit] Ammonification

Nitrates are the form of nitrogen most commonly assimilated by plant species, which, in turn are consumed by heterotrophs for use in compounds such as amino and nucleic acids. The remains of heterotrophs will then be decomposed into nutrient-rich organic material. Bacteria or in some cases, fungi, will convert the nitrates within the remains back into ammonia.

[edit] Nitrification

Main article: Nitrification

The conversion of ammonia to nitrates is performed primarily by soil-living bacteria and other nitrifying bacteria. The primary stage of nitrification, the oxidation of ammonia (NH₃) is performed by bacteria such as the Nitrosomonas species, which converts ammonia to nitrites (NO₂^-). Other bacterial species, such as the Nitrobacter, are responsible for the oxidation of the nitrites into nitrates (NO₃^-) (Smil, 2000)

[edit] Anaerobic Ammonium Oxidation

Main article: Anammox

In this biological process, nitrite and ammonium are converted directly into dinitrogen gas. This process makes up a major proportion of dinitrogen conversion in the oceans.

[edit] Denitrification

Main article: Denitrification

Denitrification is the reduction of nitrates back into the largely inert nitrogen gas (N₂), completing the nitrogen cycle. This process is performed by bacterial species such as the Pseudomonas and Clostridium. (Smil, 2000) .

[edit] Human Influences on the Nitrogen Cycle

Humans have contributed significantly to the nitrogen cycle by artificial nitrogen fertilization (primarily through the Haber Process, using energy from fossil fuels to convert N₂ to ammonia gas (NH₃) and planting of nitrogen fixing crops (Vitousek et al., 1997). In addition, humans have significantly contributed to the transfer of nitrogen trace gases from Earth to the atmosphere. N₂O has risen in the atmosphere as a result of agricultural fertilization, biomass burning, cattle and feedlots, and other industrial sources (Chapin et al. 2002). N₂O has deleterious effects in the stratosphere, where it breaks down and acts as a catalyst in the destruction of atmospheric ozone. NH₃ in the atmosphere has tripled as the result of human activities. It is a reactant in the atmosphere, where it acts as an aerosol, decreasing air quality and clinging on to water droplets, eventually resulting in acid rain. Fossil fuel combustion has contributed to a 6 or 7 fold increase in NOx flux to the atmosphere. NO actively alters atmospheric chemistry, and is a precursor of tropospheric (lower atmosphere) ozone production, which contributes to smog, acid rain, and increases nitrogen inputs to ecosystems (Smil, 2000). Ecosystem processes can increase with nitrogen fertilization, but anthropogenic input can also result in nitrogen saturation, which weakens productivity and can kill plants (Vitousek et al., 1997). Decreases in biodiversity can also result if higher nitrogen availability increases nitrogen-demanding grasses, causing a degradation of nitrogen-poor, species diverse heathlands (Aerts and Berendse 1988).

[edit] References

• Aerts, R. and F. Berendse. 1988. The effect of increased nutrient availability on vegetation dynamics in wet heathlands. Vegetatio. 76: 63-69.
• Chapin, S.F. III, Matson, P.A., Mooney H.A. 2002. Principles of Terrestrial Ecosystem Ecology. Springer Publishers:New York.
• Smil, V (2000). Cycles of Life. ScientificAmerican Library, New York. 
• Vitousek, PM; Aber, J; Howarth, RW; Likens, GE; Matson, PA; Schindler, DW; Schlesinger, WH; Tilman, GD (1997). "Human Alteration of the Global Nitrogen Cycle: Causes and Consequences". Issues in Ecology 1: 1-17. 
• The Nitrogen Cycle, and New Tank Syndrome http://www.aquariumdomain.com/guideTheNitrogenCycle.asp, accessed 2006-07-16.
• Raven, P.H. and G.B. Johnson. 1996. Biology. Wm. C. Brown Publishers.