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Terrestrial δ 15 N (vegetation, soil)

Input δ 15 N. Gaseous δ 15 N. I. f gas loss ε G. G. Terrestrial δ 15 N (vegetation, soil). Denitrification Zone NO 3 -. f leaching ε L. L. Hydrologic δ 15 N. (Houlton et al., PNAS , 2006 ; Houlton et al., PNAS, 2007; Houlton and Bai , PNAS , 2009

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Terrestrial δ 15 N (vegetation, soil)

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  1. Input δ15N Gaseous δ15N I fgas loss εG G Terrestrial δ15N (vegetation, soil) Denitrification Zone NO3- fleaching εL L Hydrologic δ15N (Houlton et al., PNAS, 2006; Houlton et al., PNAS, 2007; Houlton and Bai, PNAS, 2009 Bai and Houlton, GBC, 2009)

  2. Observation and modeling Global data Lab and field experiments Houlton and Bai, PNAS, 2009

  3. Denitrification fluxes

  4. 15N/14N in California – global array

  5. Hypotheses 1. Inputs? 2. Leaching? 3. Gas loss?

  6. Work at KREW Previous/current work – • d15N of soil and plant matter, Providence (P303) vs. Bull (B203); foliar and soil d15N increased with increasing elevation (Sara Enders’s thesis) Planned/future work – • Stream and deposition – d15N, d18O, Dd17O • Extractable d15N – NH4+, NO3-, DON • Isotope effect expression experiments in soil

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