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N 2 O-It ’ s No Laughing Matter!

N 2 O-It ’ s No Laughing Matter!. Leilei Ruan and Sandy Erwin. Introduction. Surface temperature has increased to 0.74 o C from 1906 to 2005 and are expected to rise to 1.1-6.4 o C by 2100. The increases of greenhouse gas (CO 2 , CH 4 and N 2 O) since 1750 are dramatic

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N 2 O-It ’ s No Laughing Matter!

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  1. N2O-It’s No Laughing Matter! LeileiRuan and Sandy Erwin

  2. Introduction Surface temperature has increased to 0.74 oC from 1906 to 2005 and are expected to rise to 1.1-6.4 oC by 2100. The increases of greenhouse gas (CO2, CH4 and N2O) since 1750 are dramatic compared with antecedent concentrations CO2 concentration 280 ppm 379 ppm CH4 715 ppb 1774 ppb N2O 270 ppb 319 ppb

  3. Biofuels Question: can biofuels really mitigate Greenhouse gas (GHG) emissions?

  4. Question: can biofuels really mitigate Greenhouse gas (GHG) emissions? Biofuels are not 100% “GHG neutral” due to cultivation • Soil CO2 will release when soil carbon is oxidized following cultivation • CH4 oxidation is reduced • N2O is released

  5. Nitrogen cycle N2 N2 NOx, N2O NOx, N2O Nitrogen in animals and microbes Nitrogen back to soil Nitrogen in plants + Bacteria fix N2 NH4+ NO3- denitrification nitrification

  6. Extra source for nitrogen cycle: http://youtu.be/6GLIzlUD-zw • Soil Safari : http://school.discoveryeducation.com/schooladventures/soil/down_dirty.html www.glbrc.org

  7. The impacts of nitrogen fertilizer management on GHG emissions in switchgrass Hypothesis: The response in soil N2O emissions to the inputs of N fertilizer in switchgrass will be non-linear; in particular, fluxes will increase sharply after biomass yields no longer increase.

  8. Objective 1 : To determine the Impacts of nitrogen fertilizer management on GHG emissions in switchgrass Hypothesis: The response in soil N2O emissions to the inputs of N fertilizer in switchgrass will be non-linear; in particular, fluxes will increase sharply after biomass yields no longer increase.

  9. Experimental design http://lter.kbs.msu.edu/photos/index.php

  10. 4.75m 15m Block 1 Block 2 10m Block 2 Block 1 N-Rate( kg ha-1) Block 3 Block 4

  11. Experimental materials and methods Static Chamber - 4 samples taken during an hour-long closure. Gas Chromatograph: N2O (ECD) (CV=2.4%), CH4 (FID), and CO2 (IRGA) analysis

  12. Field time www.glbrc.org

  13. Data nugget and discussion www.glbrc.org

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