Nitrogen Cycle(1) Nitrogen gas (N2) in
atmosphere
Ammonium (NH4
+)Nitrites (NO2
-)
Nitrates (NO3
-)(3c)Decomposers
(bacteria & fungus)
(3a) Nitrates “assimilated” into plant roots
(3b)Plants & Animals
(4)Denitrifying
Bacteria
(1)
(3c)
(3a)(3b) (4)
(2) Nitrogen “fixed” by bacteria into Ammonium & Nitrates
(2)
Carbon Cycle(1) CO2 in atmosphere
(2) CO2 “fixed byplants throughphotosynthesis
(3) Animals eat plants
(3c) Plants/Animalsdecompose
(detritus)
(3b) Cellular Respiration
(3d) Burning)
(1)
(2)
(3a)
(3b)
(3c)
(3d)
Phosphorous Cycle
(2b) Phosphates in rock
(2a) Phosphates in plants/animals
(1) Phosphates in soil
Phosphates in soil
(2a)
(1)
(2b)