Phosphorus Cycle BR: How do humans use Phosphorus?

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Presentation transcript:

Phosphorus Cycle BR: How do humans use Phosphorus? SWBAT: -Recognize the steps of the Phosporus SWBAT: -Understand the affects that the phosphorus cycle has an a system.

Phosphorus Organisms need phosphorus for biological processes. It is a major component of DNA/RNA/ATP (important for energy transfer) as well as phospholipids that form all cell membranes. Required by both plants and animals Limiting nutrient in many fresh water/marine food webs http://www.youtube.com/watch?v=RKkC2JpjaGc

Phosphorus Cycle

Phosphorus cycle (cont.) Steps: *1. Weathering of uplifted rocks lead to phosphates on land. (some phosphates go back to ocean) *1: Phosphate mining leads to the creation and use of phosphate fertilizers. Applied to fields (leaching) and can either run off into streams, become part of soil pool, or be absorbed by plants 2:Excretion/decompostition release phosphates on land or in water. 3: Dissolved phosphates contribute to the ocean sediments. They then begin to convert into phosphate rocks. 4: Geologic forces can slowly lift up phosphate rocks from the ocean floor to form mountains.

Negative affects of Phosphorus To much phosphorus can negatively affect a system, mostly marine systems. EX) The Algal bloom http://www.youtube.com/watch?v=YO3Gg3YfJ84

Human impacts on Cycle From the 1940’s trough 1900’s, phosphates used in laundry detergents caused leached phosphorus emitions into streams, rivers, and lakes. Fertilizers containing phosphorus lead to phosphates in water (excess)

Quiz 1) Phosphorus is a major component of…? 2) Describe the steps of the phosphorus cycle 3) What is an Algal Bloom? 4) How do humans use phosphorus for agriculture? 5) Why is phosphorus a limiting nutrient in marine systems? 6) In the mid to late 1900’s, phosphates were used in…?

Work Cited Friedland, A. (2011). Environmental science for ap. (1st ed., pp. 71-72). Algal bloom hit center stage. (2008, july 28). Retrieved from http://www.youtube.com/watch?v=YO3Gg3YfJ84 The phosphorus cycle in 65 seconds. (September, 2009 20). Retrieved from http://www.youtube.com/watch?v=RKkC2JpjaGc