Greenhouse gases from agriculture: processes and sources Christoph Müller Justus Liebig University, Giessen, Germany University College Dublin, Dublin, Ireland
Source : http://www.ipcc.ch/report/graphics/index.php?t=Assessment%20Reports&r=AR5%20-%20Synthesis%20Report&f=Topic%201
Global Greenhouse Gas Emissions by Gas by Economic Sector Global Warming Potential (GWP)) CO 2 equivalents = CO 2 = 1 kg CO 2 x 1 N 2 O = 265 + kg CH 4 x 28 CH 4 = 28 + kg N 2 O x 265 Source : https://www.epa.gov/ghgemissions/global-greenhouse-gas-emissions-data
CO 2 Carbon storage in soils C input > C output e.g. residues regulated by: - O 2 (wetlands) - Temperature SOM è Warming/wetland aeration = enhanced C output C org, N org
CH 4 CO 2 Methane emission Methanogenesis > CH 4 oxidat. e.g. rice, Affected by: wetlands - Soil cultivation - Fertilization SOM higher net Higher CO 2 è CH 4 emission C org, N org
CH 4 CO 2 N 2 N 2 O N 2 O emission N supply > N demand Green Revolution High N 2 O emissions: N-fert - Low pH, low C org, - High N supply Increased Higher CO 2 è N 2 O N 2 O emissions SOM NH 4 NO 3 + - C org, N org
CH 4 CO 2 N 2 N 2 O Green Revolution N-fert Nuclear Techniques 13 C, 18 O, 15 N N 2 O To identify individual processes SOM NH 4 NO 3 + - C org, N org
CH 4 CO 2 N 2 N 2 O Mitigation Options Ø Enhance Carbon Storage Green Revolution è peatland protection, rewetting N-fert N 2 O Ø Climate-Smart Agricultural Practices è optimize supply of nutrients and water SOM NH 4 NO 3 + - Ø Soil Amendments C org, N org è Inhibitors, biochar
“The Nation that destroys its soil destroys itself. ” Franklin D. Roosevelt, 1937
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