Interdependence of biotic and abiotic components by taking nitrogen cycle as an example
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abiotic helps in nitrogen fixation
biotic helps in nitrogen and denitrification
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The nitrogen cycle is another biogeochemical cycle. It is also one of the most important cycles in terrestrial ecosystems. Nitrogen is used by living things to produce organic molecules, such as proteins and nucleic acids. Soil, oceans, and the atmosphere hold stores of nitrogen. The largest nitrogen store is the Earth’s atmosphere. Plants take up nitrogen as nitrates and ammonium. By consuming dead or living organic matter, animals obtain the nitrogen they need for growth, reproduction, and metabolism.
Human activity has significantly altered the nitrogen cycle. The following are some human practices that have affected the nitrogen cycle:
Enhancing crop growth with the use of nitrogen-based fertilizers. Nitrogen-based fertilizers do not remain on agricultural soils; they end up in groundwater systems. Estuaries, streams, rivers, and lakes all show evidence of excess nitrogen including the effects of eutrophication which can alter or even destroy many aquatic ecosystems.
Earth’s atmosphere shows increasing levels of nitrogen as a consequence of burning forests and fossil fuels. Many of these are greenhouse gases that have affected global climate and are melting polar ice caps. Left unchecked these trends of pollution will lead to drastic changes in climate all around the world and the potential for rising sea levels and more powerful storms.
The process of livestock ranching releases massive amounts of ammonia and methane. Entering the soil and atmospheric systems, these nitrogen sources also leach into waterways and are changing the natural balance of nitrogen cycles.
Human sewage from septic tanks also leaches nitrogen into the soil.