steps of the phosphorus cycle. phosphorus is a limiting factor in soils and streams –is an...
Post on 18-Jan-2016
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Steps of the Phosphorus Cycle
Phosphorus
• Is a limiting factor in soils and streams– Is an important component of DNA, RNA, and
ATP – the molecule cells use to get energy– Organisms can’t grow/function without
Phosphorus
• When you have too much = pond scum• Basically a one-way street (because of time
scales and element properties, etc.)• Phosphorus is NEVER in the atmosphere
Sulfur Cycle
• The Sulfur Cycle contributes to acid rain
Reservoir
• Reservoir: pool of stock of material• source (emits), sink (takes in), can be both• Flux: rate of transfer between reservoirs per unit time• Average residence time: time taken for material to cycle
through system• average residence time = total size of reservoir/rate
of flow• short residence time: small reservoirs, high transfer
rates, easy to impact• long residence time: large reservoirs, slow transfer,
slower to change
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