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Unformatted text preview: Lecture 18 - Biogeochem. (Chap 19) 1 1 Nutrient Cycling Nutrient Cycling Chapter 19 Chapter 19 Nutrient Cycles Nutrient Cycles Phosphorus; Nitrogen; Carbon Phosphorus; Nitrogen; Carbon Rates of Decomposition Rates of Decomposition Terrestrial Terrestrial Aquatic Aquatic Organisms and Nutrients Organisms and Nutrients Disturbance and Nutrients Disturbance and Nutrients 2 • The study of the movement of nutrients through The study of the movement of nutrients through living organisms and the nonliving environment. living organisms and the nonliving environment. • Pools: locations and forms of nutrients. locations and forms of nutrients. Nitrogen: Largest pool Nitrogen: Largest pool Phosphorus: Pool is Phosphorus: Pool is Carbon: Rarely limits Carbon: Rarely limits • Fluxes: processes that processes that Biogeochemistry Biogeochemistry 3 Phosphorus Cycle Phosphorus Cycle • Global phosphorus cycle does NOT Global phosphorus cycle does NOT include substantial include substantial • Largest quantities found in Largest quantities found in Most of this is in forms not directly Most of this is in forms not directly available to plants. available to plants. This This “unavailable unavailable ” phosphorus is slowly phosphorus is slowly released released 4 Phosphorus Cycle Phosphorus Cycle • “Average Average ” Phosphorus atom released from Phosphorus atom released from rock rock spends a long time in the soil spends a long time in the soil Years to Years to • Once in a stream - move relatively quickly to Once in a stream - move relatively quickly to ocean. ocean. Weeks Weeks • In ocean, it is recycled through biota and In ocean, it is recycled through biota and remineralized remineralized in water many times throughout in water many times throughout the depths. the depths. Does this for perhaps Does this for perhaps of years of years Lecture 18 - Biogeochem. (Chap 19) 2 5 Phosphorus Cycle Phosphorus Cycle 6 Nitrogen Cycle Nitrogen Cycle • Includes Includes • Only microorganism that Only microorganism that “fix fix ” nitrogen can nitrogen can Energy-demanding process. Energy-demanding process. N 2 Once N is fixed it is available to other Once N is fixed it is available to other organisms. organisms. • Note that Note that lightning can also contribute lightning can also contribute 7 Nitrogen Cycle Nitrogen Cycle • Nitrogen cycle is complicated with many Nitrogen cycle is complicated with many biochemical pathways - mostly microbial - biochemical pathways - mostly microbial - converting it and using/supplying energy....
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This note was uploaded on 11/16/2010 for the course BIO 2227 taught by Professor Sandars during the Spring '10 term at Temple.
- Spring '10