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NUTRIENT CYCLING IN NATURE: WATER CYCLE; NITROGEN CYCLE; DECOMPOSITION IN NATURE

CONTENT

  1. The Water Cycle
  2. The Nitrogen Cycle
  3. Decomposition in Nature

 

The Water Cycle

Water circulates mainly within the abiotic environment. Only a small proportion recycles through living organisms. Plants take up water from the soil in large amounts. They use a little part of it in photosynthesis and other metabolic reactions and lose most of the water to the atmosphere by transpiration. Animals take in water through their food and drink, and lose most of it through respiration, urination and defecation. Water is also released into the atmosphere by decomposition and combustion.

The water cycle is maintained mainly by the evaporation and condensation of water in the abiotic environment. The endless cycling of water on earth as rain, back to the atmosphere through evaporation, then back to the earth again as rain maintains the various aquatic environments and the supply of water which is necessary for life on land. The water cycle carries many chemical nutrients through the ecosystem and it is an important factor in modifying environmental temperature.

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