PHOSPHOROUS CYCLE

PHOSPHOROUS CYCLE

1. ROCKS

   • Phosphate ion are released from inside rocks into the soil by weathering.
   • SEAS/LAKE/RIVERS
     • Weathering of rock also releases phosphate ions into seas/lakes/rivers which is taken up by aquatic producers (algae) and passed along the food chain to birds.
     • ALGAE/OTHER PRIMARY PRODUCERS
       • FISH
         • BIRD
           • The waste produced by birds is known as guano and contains high proportions of phosphate ions.
             • Guano returns a significant amount of phosphate ions to the soil - particularly in costal areas.
               • Used as a natural fertiliser.
           • GUANO
             • SOIL
   • SOIL
     • PLANTS
       • Phosphate ions are taken up by plants by the roots.
         • Mycorrihizae greatly increases the rate at which phosphorous is assimilated.
       • ANIMALS
         • FAECES/URINE