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Greenhouse gases from agriculture: processes and sources
Christoph Müller
Justus Liebig University, Giessen, Germany University College Dublin, Dublin, Ireland
Greenhouse gases from agriculture: processes and sources Christoph - - PowerPoint PPT Presentation
Greenhouse gases from agriculture: processes and sources Christoph - - PowerPoint PPT Presentation
Greenhouse gases from agriculture: processes and sources Christoph Mller Justus Liebig University, Giessen, Germany University College Dublin, Dublin, Ireland Source :
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Source: http://www.ipcc.ch/report/graphics/index.php?t=Assessment%20Reports&r=AR5%20-%20Synthesis%20Report&f=Topic%201
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Global Greenhouse Gas Emissions
by Gas
Source: https://www.epa.gov/ghgemissions/global-greenhouse-gas-emissions-data
Global Warming Potential (GWP))
CO2 = 1 N2O = 265 CH4 = 28 CO2 equivalents = kg CO2 x 1 + kg CH4 x 28 + kg N2O x 265
by Economic Sector
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CO2
SOM
Corg, Norg
Carbon storage in soils
C input > C output e.g. residues regulated by:
- O2 (wetlands)
- Temperature
è Warming/wetland aeration = enhanced C output
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CO2
SOM
Corg, Norg
Methane emission
Methanogenesis > CH4 oxidat. e.g. rice, wetlands Affected by:
- Soil cultivation
- Fertilization
higher net CH4 emission
CH4
Higher CO2 è
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CO2
SOM
Corg, Norg
CH4
NH4
+
NO3
- N2O
N2O N2
Green Revolution N-fert N2O emission
N supply > N demand High N2O emissions:
- Low pH, low C org,
- High N supply
Increased N2O emissions Higher CO2 è
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CO2
SOM
Corg, Norg
CH4
NH4
+
NO3
- N2O
N2O N2
Green Revolution N-fert Nuclear Techniques
13C, 18O, 15N
To identify individual processes
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CO2
SOM
Corg, Norg
CH4
NH4
+
NO3
- N2O
N2O N2
Green Revolution N-fert
Mitigation Options
ØEnhance Carbon Storage
è peatland protection, rewetting
ØSoil Amendments
è Inhibitors, biochar
ØClimate-Smart Agricultural Practices
è optimize supply of nutrients and water
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