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Write An Essay On Biogeochemical Cycles

Short Notes on Biogeochemical Cycles !

Producers are the only living component of the ecosystem which is capable of converting the solar energy into chemical energy of food. This is done by process called Photosynthesis in which producers utilises the basic inorganic nutrient form their non living environment.

Image Courtesy : cnx.org/content/m45559/latest/Figure_20_02_02.jpg

This material is finally transformed into biomass of the producers which is then transferred to the consumer population and ultimately returned to the environment with the help of reducers or decomposers. This cyclic exchange of material between the living organisms and their non living environment is called Biogeochemical Cycle.

Water Cycle or Hydrological Cycle:

Water cycle can be explained on the basis of these 3 steps:

1. Evaporation of water from ocean, rivers, lake and transpiring plants takes water in the form of vapours to the atmosphere.

2. These vaporised water subsequently cool and condense to form cloud and water.

3. This cooled water vapour ultimately return to the earth as rain and snow.

Carbon Cycle:

1. Carbon enters into the living world in the form of carbon dioxide through the process of photosynthesis as carbohydrates.

2. This organic compounds (food) are then passed from the producers to the consumers (herbivores & carnivores)

3. This carbon finally returned back to the surrounding medium by the process of respiration or decomposition of dead bodies of plant and animals by decomposers.

4. Carbon is also recycled during burning of fossil fuels.

Nitrogen Cycle:

1. Nitrogen is present in the atmosphere in it elemental form and as such it cannot be utilized by living organism.

2. This elemental form of nitrogen is converted into combined state with element like H, C, O by certain bacteria so that it can be readily used by plants.

3. Nitrogen is continuously entering into the air by the action of microorganism like denitrifying bacteria and finally returned back to the cycle through action of lightening and electrification

Sulphur Cycle:

Source:

Sulphur and its compounds are required by plants and animals for synthesis of some amino acids and proteins. Some sulphur bacteria act as a media for exchanges of sulphur within the ecosystem. The sulphur cycle shows the circulation of sulphur and its compounds in the environment.

1. The sulphur oxidation is shown in the upper half of the cycle.

2. The lower section shows the conversion of sulphates into plant and cellular proteins and the decay of the dead plant and animal material by bacterial action.

3. In polluted water under anaerobic conditions hydrogen sulphide is produced by bacteria giving deposits of iron sulphide.

4. In unpolluted water under aerobic condition the sulphur bacteria transform sulphides into sulphates for further production of proteins.

 

Phosphorus Cycle:

1. Phosphorus is the key to energy in living organisms, for it is phosphorus that moves energy from ATP to another molecule, driving an enzymatic reaction, or cellular transport.

2. The keystone of getting phosphorus into trophic systems is plants. Plants absorb phosphorous from water and soil into their tissues, tying them to organic molecules. Once taken up by plants, phosphorus is available for animals when they consume the plants.

3. When plants and animals die, bacteria decompose their bodies, releasing some of the phosphorus back into the soil. Once in the soil, phosphorous can be moved 100s to 1,000s of miles from where they were released by riding through streams and rivers.

4. In some cases, phosphorous will travel to a lake, and settle on the bottom. There, it may turn into sedimentary rocks, limestone, to be released millions of years later.

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