Phosphorus Cycle
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17 Terms
Key Steps
Weathering & Erosion
Assimilation
Consumption by Animals
Decomposition
Sedimentation & Uplift
Weathering & Erosion
Phosphorous rocks break down
from wind, rain, uplift
release phosphate into soil & H2O
Assimilation
Plants absorb
dissolved inorganic phosphates from soil
H2O from their roots
Consumption by Animals
P up food chain ↑
herbivores eat plants
carnivores eat herbivores
Decomposition
Bacteria & Fungi breakdown
Dead Organic Matter & Animal Waste
→ inorganic phosphate
→ soil & water
Sedimentation & Uplift
Aquatic Systems, phosphorus settles
→ forms Sediment
→ new Phosphate Rock
Acid Soils (4 -5.5)
H2PO4- dominates
Alkaline Soils
HPO42- dominates
Mycorrhizal Fungi
Form symbiosis w/roots
Hyphae extend soil for P uptake
Fungi
absorb & transport Phosphate → roots
Plants Carbohydrates
improves
Nutrient Absorption
Plant growth
Major P in Soil
Organic P
Calcium Inorganic P
Iron/Aluminum Inorganic P
Organic P
in Biomass
in Labile
in Protected Organic Matter
Calcium Inorganic P
dominant in alkaline soils.
Iron/Aluminum Inorganic P
dominant in acidic soils
Gains
Weathering
Decomposition
Fertilization
Geological Uplift
Losses
Sedimentation
Erosion & Runoff
Leaching
Consumption by Animals
Note 
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