Lecture Oct 22

Lecture Oct 22 - 21/10/2010 1 Carbon & Energy...

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Unformatted text preview: 21/10/2010 1 Carbon & Energy flow through Ecosystems ENVR 200 Oct 22, 2010 Carbon and energy are linked as they move through ecosystems because the same processes govern:- their entry into ecosystems, transfe within ecosystems Overview- transfer within ecosystems, - loss from ecosystems Primary production Producers Sun Photosynthesis links the biosphere to the atmosphere, the radiation budget, and the hydrosphere Radiation Photosynthesis Atmosphere Hydrosphere Radiation budget 6CO 2 + 6H 2 O + energy C 6 H 12 O 6 + 6O 2 Low energy carbon high energy carbon Photosynthesis produces high energy Photosynthesis produces high energy carbon compounds that can be used as an energy source by other organisms through respiration side note on energy Carbon Oxygen (aerobic) metabolism is very energy efficient and most organisms use it but it is not the only way to make a living. Some organisms se high energ compo nds Some organisms use high energy compounds (often in soil, sediment, or lithosphere): Ammonium NH 4 + Nitrite NO 2- H 2 S S 2 Link cycles of C, N and S in different ways Photosynthesis Herbivory Predation Producers Consumers I Sun Carbon Inorganic nutrient pool Predation Decomposition Consumers II Consumers III Decomposers Carbon flows through ecosystem 21/10/2010...
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This note was uploaded on 11/15/2010 for the course ENVR 200 taught by Professor Rhemtulla during the Fall '10 term at McGill.

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Lecture Oct 22 - 21/10/2010 1 Carbon & Energy...

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