Lecture27bio

Lecture27bio - • Plants can absorb ammonia and ammonium...

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BIOLOGY 1001 Monday, April 28, 2008 Lecture 27 Other Greenhouse Gases CFCs: Synthetic gases used in plastics and in refrigeration. Methane: released by natural gas production, livestock Nitrous oxide: released by bacteria, fertilizers, and animal wastes. Nitrogen Main reservoir: nitrogen gas Nitrogen gas cant enter food web Nitrogen Fixation Plants cannot use nitrogen gas. Nitrogen-fixing bacteria convert nitrogen gas into ammonia (NH3)
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Unformatted text preview: • Plants can absorb ammonia and ammonium. • Mutualism: Plants get fixed nitrogen, bacteria get a safe place to live. Nitrogen Loss • Lost from soils via leaching and runoff – “dead zone” • Denitrifying bacteria convert fixed “nitrogen” into nitrogen. Human Increase • Nitrogen loss by clearing forests and grasslands. • Nitrogen in water and air by using fertilizers and by burning fossil fuels. • TOO much or TOO little nitrogen is bad for plants and aquatic life....
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This note was uploaded on 06/09/2010 for the course BIOL 1001 taught by Professor Minor during the Spring '08 term at LSU.

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