Cycling of Materials in Ecosystems: Biogeochemical Cycles

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Presentation transcript:

Cycling of Materials in Ecosystems: Biogeochemical Cycles Powerpoint Templates

What is a biogeochemical cycle? Exchange of matter through biosphere Paths of water, carbon, nitrogen, and phosphorus pass from the nonliving environment (nonliving reservoir) to living organisms (living reservoir), and then back to the nonliving environment

Example of a Biogeochemical Cycle: The Nitrogen Cycle Nitrogen fixation: bacteria take nitrogen from the air and convert it to a form usable by plants

Example of a Biogeochemical Cycle: The Carbon Cycle Greenhouse effect: carbon dioxide traps heat in the atmosphere, making life possible

Example of a Biogeochemical Cycle: The Water Cycle

Which cycle is least dependent on biotic processes?