Nitrogen and Phosphorus Cycle

Nitrogen


• We draw nitrogen from the atmosphere and transform it into reactive forms (nitrate and ammonia)
  • Part of it goes to the biosphere
    • Use of Nitrogen as fertilizer
  • Part goes back in the atmosphere causing air pollution, acid rains and GHG effects
  • Part of it goes back to oceans and rivers
    • Goes algae to bloom


Phosphorus

Phosphorus Cycle

Caused by fertilizer application

• Over nutrient areas
  • Algae bloom, then die, causing
    • Ocean Dead Zones (potentially irreversible)


---

Created on: 2021-01-18 Inspired by: Link: Related: Course - Planetary Boundaries | Planetary Boundaries