Phosphorus Cycle

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17 Terms

1

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Key Steps

Weathering & Erosion
Assimilation
Consumption by Animals
Decomposition
Sedimentation & Uplift

<ul><li><p><strong>Weathering & Erosion</strong></p></li><li><p><strong>Assimilation </strong></p></li><li><p><strong>Consumption by Animals </strong></p></li><li><p><strong>Decomposition </strong></p></li><li><p><strong>Sedimentation & Uplift</strong></p></li></ul><p></p>

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Weathering & Erosion

Phosphorous rocks break down
from wind, rain, uplift
release phosphate into soil & H2O

<ul><li><p><strong>Phosphorous rocks break down </strong></p></li><li><p>from wind, rain, uplift </p></li><li><p><strong>release phosphate into soil & H2O</strong></p></li></ul><p></p>

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Assimilation

Plants absorb

dissolved inorganic phosphates from soil
H2O from their roots

<p>Plants absorb</p><ul><li><p><strong>dissolved inorganic phosphates from soil</strong></p></li><li><p><strong>H2O from their roots</strong></p></li></ul><p></p>

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Consumption by Animals

P up food chain ↑
herbivores eat plants
carnivores eat herbivores

<ul><li><p><strong>P up food chain</strong> <span>↑</span></p></li><li><p>herbivores eat plants </p></li><li><p>carnivores eat herbivores</p></li></ul><p></p>

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Decomposition

Bacteria & Fungi breakdown

Dead Organic Matter & Animal Waste

→ inorganic phosphate

→ soil & water

<p>Bacteria & Fungi breakdown </p><p><strong>Dead Organic Matter & Animal Waste </strong></p><p><span><strong><span>→ inorganic phosphate </span></strong></span></p><p><strong><span>→ soil & water</span></strong></p>

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Sedimentation & Uplift

Aquatic Systems, phosphorus settles

→ forms Sediment

→ new Phosphate Rock

<p>Aquatic Systems, <span>phosphorus settles </span></p><p><strong><span>→ forms Sediment </span></strong></p><p><strong><span>→ new Phosphate Rock</span></strong></p>

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Acid Soils (4 -5.5)

H₂PO_4-dominates

<p>H<sub>2</sub>PO<sub>4- </sub>dominates</p>

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Alkaline Soils

HPO₄^2-dominates

<p>HPO<sub>4</sub><sup>2- </sup>dominates </p>

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Mycorrhizal Fungi

Form symbiosis w/roots

Hyphae extend soil for P uptake

<p>Form symbiosis w/roots </p><ul><li><p><strong>Hyphae extend soil for P uptake </strong></p></li></ul><p></p>

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Fungi

absorb & transport Phosphate → roots

<p>absorb & transport <strong>Phosphate</strong> <strong><span>→ roots </span></strong></p>

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Plants Carbohydrates

improves

Nutrient Absorption
Plant growth

<p></p><p>improves </p><ul><li><p><strong>Nutrient Absorption </strong></p></li><li><p><strong>Plant growth</strong></p></li></ul><p></p>

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Major P in Soil

Organic P
Calcium Inorganic P
Iron/Aluminum Inorganic P

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Organic P

in Biomass

in Labile
in Protected Organic Matter

<ul><li><p><span style="background-color: transparent;"><span>in </span><strong><span>Biomass</span></strong></span></p></li></ul><ul><li><p><span style="background-color: transparent;"><span>in</span><strong><span> Labile</span></strong></span></p></li><li><p><span style="background-color: transparent;"><span>in </span><strong><span>Protected Organic Matter</span></strong></span></p></li></ul><p></p>

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Calcium Inorganic P

dominant in alkaline soils.

<p><span style="background-color: transparent;"><span>dominant in </span><strong><span>alkaline soils.</span></strong></span></p>

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Iron/Aluminum Inorganic P

dominant in acidic soils

<p><span style="background-color: transparent;"><span>dominant in </span><strong><span>acidic soils</span></strong></span></p>

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Gains

Weathering
Decomposition
Fertilization
Geological Uplift

<ul><li><p><strong>Weathering</strong></p></li><li><p><strong>Decomposition</strong></p></li><li><p><strong>Fertilization</strong></p></li><li><p><strong>Geological Uplift</strong></p></li></ul><p></p>

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Losses

Sedimentation
Erosion & Runoff
Leaching
Consumption by Animals

<ul><li><p><strong>Sedimentation</strong></p></li><li><p><strong>Erosion & Runoff</strong></p></li><li><p><strong>Leaching</strong></p></li><li><p><strong>Consumption by Animals</strong></p></li></ul><p></p>