- P enters ecosystems by weathering of rocks
- P doesn't have a gas form, not found in atmosphere
- PO4 3- (phosphate) doesn't undergo redox reactions under most conditions
- P can be bound tightly to soil minerals in soils
- Aquatic systems (lakes) limited by P
- Old tropical soils can be limited by P
- Non-occluded -available to plants
- Experimental test of the Walker and Syer's Model
• Forest in Hawaii
• Chronosequence of soil age
• Treatments:
- control
- N addition
- P addition
- N+P addition
• Measured diameter growth of tree
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Ecosystems Lections