Lec19_Anthrop_Sources_of_N_P_POST

Lec19_Anthrop_Sources_of_N_P_POST - N in the Environment...

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Unformatted text preview: N in the Environment ATMOSPHERIC N 99.99 % N 2 SEDIMENTARY N AQUATIC & TERRESTRIAL ECOSYSTEMS >95 % N 2 ~4 x 10 9 Tg ~5 x 10 8 Tg ~2 x 10 7 Tg Fixed, but not necessarily in available form Data from Jaffe DA (1992) Lecture 19: Anthropogenic Sources of N and P CHEM/ENVS 380, May 4, 2010 1. Know the major components of the N cycle. 2. Be able to determine oxidation states of various N species. 3. What is N fixation? What does it take to fix N? 4. How do anthropogenic activities affect the N cycle? 5. What is the ultimate source of P? How has human activity affected the P cycle? 6. What are some of the major steps involved in treating wastewater? Biological Transformations of N Compounds N 2 NH 4 + ⇆ NH 3 NO 3- Organic N (plant and animal tissue) N i t r o g e n f i x a t i o n D e c o m p o s i t i o n A s s i m i l a t i o n b y p l a n t s A s s i m i l a t i o n b y p l a n t s D e n i t r i f i c a t i o n Nitrification N 2 O gas Where does “lightning” fall? Sarmiento and Gruber (2006) Spiro and Stigliani (2003)...
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Lec19_Anthrop_Sources_of_N_P_POST - N in the Environment...

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