Lecture #18 - Lecture 18 The Nitrogen Cycle BBOM 11e Sec....

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1 Lecture 18 Lecture 18 The Nitrogen Cycle The Nitrogen Cycle BBOM 11e Sec. 19.12, 19.22, 12.3, 17.14, 12.9, 17.12 Quiz #3 Lectures 13-17 The Nitrogen Cycle: Major Reservoirs The Nitrogen Cycle: Major Reservoirs N2 gas is Very stable NH 4 + The nitrogen cycle centers on NH 4 + (NH 3 ). Why is nitrogen so important? NO 3 - BBOM 11e Sec. 19.12 Answer: Plant productivity usually is limited by availability of N (NH4+) in soil
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2 The Nitrogen Cycle: Microbial guilds The Nitrogen Cycle: Microbial guilds N2 gas is Very stable Microbial Guilds carry out the 4 key transformations NH 4 + Four key microbial transformations in the N cycle 1. N2 fixers 2. Denitrifiers 3. Nitrifiers 4. Ammonifiers NO 3 - BBOM 11e Sec. 19.12 4. Ammonification 1. N2 fixation 2. Denitrification 3. Nitrification Microbial Guilds Link The Nitrogen Cycle to C, H and O Cycles Microbial Guilds Link The Nitrogen Cycle to C, H and O Cycles O 2 H+ Organic C CO 2 H 2 CO 2 H 2 O N2 fixers Azotobacter spp. Cyanobacteria
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This note was uploaded on 02/13/2008 for the course BIO 2900 taught by Professor Ghiorse during the Fall '07 term at Cornell University (Engineering School).

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Lecture #18 - Lecture 18 The Nitrogen Cycle BBOM 11e Sec....

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