Phosphorus cycle

2,228 views

Published on

Phosphorus cycle

Published in: Technology, Business
  • Be the first to comment

Phosphorus cycle

  1. 1. PHOSPHORUS CYCLE Definition: Cycling of phosphorus between the biotic and abiotic component of the environment
  2. 2. 1. Phosphorus is an essential compound of  nucleic acid (DNA, RNA)  some proteins  phospholipids  ATP  other important organic compounds 2. It is an uncommon element, forms no gaseous compounds and is often a limiting factor in the biotic productivity of ecosystems.
  3. 3. 3. Inorganic phosphate ions are absorbed (active ion uptake) by plants, then assimilated to synthesis important compounds. 4.The organic phosphates from plants are transferred to herbivores when eaten by animals and then transfer to other trophic levels in the food chains. 5. Marine birds feeding on fish can cycle back some phosphates (through decomposition of dead bodies, excreta) to the soil.
  4. 4. 6. Phosphorus is returned to the soil when organisms die.The remains of bones, teeth, shells and excretory wastes are acted on by phosphotising bacteria to release inorganic phophates. 7.Through the process of erosion, inorganic phosphates are returns to the soil, rivers, lakes, seas and oceans.There is sedimentation of phosphates on the ocean floor.
  5. 5. 8. After millions of years, geological land uplift raised the rocks containing phosphorus above sea level. 9. Erosion and mining of the rocks for manufacture of fertilisers supply inorganic phosphates to the soil.
  6. 6. THE END

×