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Greenhouse gases and agriculture: Emissions and opportunities

Greenhouse gases and agriculture: Emissions and opportunities. Richard T. Conant Natural Resource Ecology Laboratory Colorado State University. Agricultural sources and sinks of greenhouse gases. Source: IPCC 2007. CO 2. CO 2. CO 2. CO 2. CO 2. Global Carbon Cycle.

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Greenhouse gases and agriculture: Emissions and opportunities

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  1. Greenhouse gases and agriculture: Emissions and opportunities Richard T. Conant Natural Resource Ecology Laboratory Colorado State University

  2. Agricultural sources and sinks of greenhouse gases Source: IPCC 2007

  3. CO2 CO2 CO2 CO2 CO2 Global Carbon Cycle

  4. Ecosystem C trajectories Disturbance Management change System carbon

  5. CO2 CO2 CO2 Ecosystem C Ecosystem C Ecosystem C Disturbance Management change Past Agricultural Practices System C

  6. Past Agricultural Practices Erosion Intensive tillage Residue removal Low Productivity CO2 Soil organic matter

  7. Improved Agricultural Practices Conservation tillage Cover crops Conservation buffers CO2 Soil organic matter Improved rotations CRP

  8. 2020 2040 2030 2050

  9. No-tillage and crop rotation intensification Conventional wheat-fallow NT Wheat-corn-millet-fallow

  10. W-F W-C-F OC CRP kg CO2-eqiv. /ha/yr GHG balance for dryland crop systems Source: Mosier et al. 2005 + Other literature for W-F

  11. Tillage management on irrigated cropland Intensive tillage No-till

  12. GHG balance for irrigated continuous corn 202 kg N/ha 134 kg N/ha Plow No-till Plow No-till kg CO2-eqiv. /ha/yr Source: Mosier et al. 2005

  13. CO Climate Action Plan: Goal Current ag: -0.73 MMT CO2e/yr Potential C sequestration: Dryland BMP: -2.7 MMT CO2e/yr Irrigated BMP: -2.6 MMT CO2e/yr Rangeland BMP: -5.5 MMT CO2e/yr Potential CH4 from 20% emission cuts: Enteric/ruminant: -0.6 MMT CO2e/yr Manure mgmt.: -0.1 MMT CO2e/yr Potential N2O from 40% emission cuts: Manure mgmt.: -0.4 MMT CO2e/yr Fertilizer mgmt.: ?? Potential reduced fuel use, offsets: ?? Potential ag: -9.9+ MMT CO2e/yr 2005: 120 MMT CO2e/yr 2020 BAU: 158 MMT CO2e/yr 2020 Goal: 94 MMT CO2e/yr Required cut: -64 MMT CO2e/yr

  14. COMET-VR (CarbOn Management and Evaluation Tool – Voluntary Reporting) • Currently supports soil C change estimates and fuel usage • N2O emissions will be incorporated in the next version • New Colorado version under development!

  15. Conclusions • Agriculture is a significant emitter of GHGs • CO agriculture can play a major role in mitigation – reducing/offsetting CO emissions by 15% or more • Methods and tools exist to quantify GHG emission reductions and soil C sequestration.

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