After reading this essay you will learn about the nitrogen cycle. Nitrogen is the most important structural element of all living organisms. There is a vast store of nitrogen in the air, but animals and the majority of plants are unable to fix atmospheric nitrogen. The nitrogen cycle is chiefly concerned with the incorporation of atmospheric gaseous nitrogen and organic nitrogen of dead plants and animals Estimated Reading Time: 9 mins Sep 25, · Nitrogen Cycle Essay. Most nitrogen is found in the atmosphere. The nitrogen cycle is the process by which atmospheric nitrogen is converted to ammonia or nitrates. Nitrogen is essential to all living systems. To become a part of an organism, nitrogen must first be fixed or combined with oxygen or hydrogen Nitrogen Cycle Essay. This Nitrogen Cycle Essay example is published for educational and informational purposes only. If you need a custom essay or research paper on this topic, please use our writing services. blogger.com offers reliable custom essay writing services that can help you to receive high grades and impress your professors with the quality of each essay or research paper
Nitrogen Cycle Essay - Examples & Papers
This Nitrogen Cycle Essay example is published for educational and informational nitrogen cycle essay only.
If you need a nitrogen cycle essay essay or research paper on this topic, please use our writing services. com offers reliable custom essay writing services that can help you to receive high grades and impress your professors with the quality of each essay or research paper you hand in. The nitrogen N cycle describes the transformation of nitrogen into its various organic and inorganic forms and its movement between different deposits in the atmosphere, soils, vegetation, and living organisms of the micro and macro fauna.
However, the nitrogen cycle has to be managed carefully, since abundance of nitrogenous forms like nitrates in water or food can cause adverse effects on human health. Reactive nitrogenous gases in the atmosphere can contribute to climate warming and the destruction of the ozone layer. The terrestrial nitrogen balance of the nitrogen cycle with its major components can be described by the following equation:.
Nitrogen N constitutes 78 percent of the atmosphere, and the whole atmospheric store is about a million times larger than all other N stocks. Atmospheric nitrogen nitrogen cycle essay into the nitrogen cycle enter the soil-plant-water system through electrical processes, fires, combustion, and precipitation, processes by which molecular nitrogen, N2is combined with H2 or O2, nitrogen cycle essay.
The main natural nitrogen input from atmosphere to soil is induced by biological nitrogen fixation, which refers to the fixation and incorporation of atmospheric N2 by the nodules of leguminous plants through a symbiosis with bacteria of the species rhizobium, nitrogen cycle essay, as well as by nonsymbiotic fixation by autotrophic microorganisms as blue-green algae. The processes are mainly performed by species of Nitrosomonas and Nitrobacter and its kinetics are mainly dependent on the soil temperature.
The reverse process is immobilization, which refers to the transformation and subsequent incorporation of inorganic nitrogen forms into proteins, peptides, and amino acids of microor macroorganisms in the soil fauna. Mineralization is also frequently considered as the resulting net rate of all these processes, nitrogen cycle essay.
The highest mineralization rates in the history of soil ecosystems have been created by large-scale transformations of virgin land into arable land due to population pressure, nitrogen cycle essay. In general this releases about 50 percent of the nitrogen that has been organically bound in soils, nitrogen cycle essay.
Transport of nitrogen-containing soil matter through erosion can add to or reduce the amount of nitrogen cycling in a system. Further reduction of nitrogen in soils occurs through the fixation of ammonium in a biologically unavailable form in certain expanding clay minerals and, in higher quantities, through nitrogen uptake by plants.
In natural ecosystems, the nitrogen uptake by plants is adjusted to the mineralization rate, which is the same if fertilizers are added to soils in combination with agricultural crops.
If nitrogen in the soil solution is below the demands of the plant cover, the plants will be undernourished; if it exceeds the demands of the plants, it will either be leached into the groundwater or be denitrified. It can also be enriched in the plant solution. All nitrogen that is not absorbed by sinks as vegetation, soils, and microand macro-faunae is available for nitrogen cycle essay into groundwaters.
From there, dependent on physical conditions, it flows into adjacent aquifers that determine the general water flow in soils. Denitrification involves the metabolicreduction of nitrate NO3- into nitrogen N2 or nitrous oxide N2O nitrogen cycle essay. Both of these gases then diffuse into the atmosphere. Soluble carbon is used as an energy source; therefore the denitrification rate is limited by its amount and favored by anaerobic conditions. Denitrification can take place in every part of the soil profile where these conditions prevail and also in groundwater.
Similar processes occur in marine ecosystems; however, nitrogen cycle essay, there are still uncertainties about them, and estimates of N fixation by organisms vary, ranging from less than 30 to more than teragrams million tons per year, nitrogen cycle essay.
Human activities have interfered with the natural nitrogen cycle, which was in a dynamic equilibrium in preindustrial times. Then, annual fluxes of nitrogen from the atmosphere to the land and aquatic ecosystems were teragrams per year.
This was balanced by reverse denitrification, since the C and N ratio necessary for denitrification was also in equilibrium because almost all inputs were from organic origins. Industrial nitrogen cycle essay increases the emission of reactive N gases NOx to the atmosphere, where they contribute to the production of tropospheric ozone before depositing either as a gas in the form of nitrate or ammonia ions, nitrogen cycle essay, a nitric acid dissolved in precipitation, or as dry aerosols on land or sea.
Production and use of synthetic nitrogen fertilizer, produced by the Haber-Bosch process, nitrogen cycle essay, together nitrogen cycle essay expanded planting of nitrogen fixing crops and the deposition of nitrogen-containing air pollutants, have created an additional flux of about teragrams a year, only part of which is denitrified. The addition of a major new flux from atmosphere to land, by way of industrial and crop nitrogen fixation, has created an imbalance leading to increased flows to the ocean.
In the process this contributes to eutrophication of rivers and lakes. Some of the nitrogen oversupply leads to increased emissions of N2O and NOxwhich are increasing in the atmosphere and contributing to global warming, tropospheric pollution, and stratospheric ozone depletion.
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Nitrogen Cycle
, time: 6:26Essay on the Nitrogen Cycle
After reading this essay you will learn about the nitrogen cycle. Nitrogen atoms are constantly moving in a giant circle from the air, through the soil, into the bodies of plants and animals, and eventually back to the air. This whole process is called the nitrogen cycle. All Estimated Reading Time: 4 mins Nitrogen Cycle Essay. This Nitrogen Cycle Essay example is published for educational and informational purposes only. If you need a custom essay or research paper on this topic, please use our writing services. blogger.com offers reliable custom essay writing services that can help you to receive high grades and impress your professors with the quality of each essay or research paper After reading this essay you will learn about the nitrogen cycle. Nitrogen is the most important structural element of all living organisms. There is a vast store of nitrogen in the air, but animals and the majority of plants are unable to fix atmospheric nitrogen. The nitrogen cycle is chiefly concerned with the incorporation of atmospheric gaseous nitrogen and organic nitrogen of dead plants and animals Estimated Reading Time: 9 mins
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