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The Carbon Farming Initiative and Agricultural Emissions This presentation was prepared by the University of Melbourne for the Regional Landcare Facilitator.

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Presentation on theme: "The Carbon Farming Initiative and Agricultural Emissions This presentation was prepared by the University of Melbourne for the Regional Landcare Facilitator."— Presentation transcript:

1 The Carbon Farming Initiative and Agricultural Emissions This presentation was prepared by the University of Melbourne for the Regional Landcare Facilitator training funded through the Australian Government’s Carbon Farming Initiative Communications Program

2 This presentation explains the carbon cycle in animal production systems and the various pools of carbon PART 2: ANIMAL CARBON CYCLE

3 Grazing system carbon cycle Content –The carbon cycle in animal production systems and the various pools of carbon –Fluxes between carbon pools –Some terms: Hydrogen (H 2 ), Carbon (C), Oxygen (O 2 ), Nitrogen (N) Methane (CH 4 ), carbohydrate (CHO), carbon dioxide (CO 2 ), water (H 2 O), bicarbonate (HCO 3 ) Nitrate (NO 3 - ), Nitrite (NO 2 - ), Ammonia (NH 3 ), Ammonium (NH 4 + ), nitrous oxide (N 2 O)

4 Grazing system carbon cycle Atmosphere Animal Plant Soil Eckard 2011

5 Grazing system carbon cycle Carbon into plants –Photosynthesis CO 2 + H 2 O + chlorophyll + solar energy -> CHO + O 2 Structural carbohydrate –Cellulose, hemi-cellulose, lignin Non-structural carbohydrate –Sugars Fats/ Lipids Protein/amino acids Carbon from plants –Respiration Burning sugars - energy for growth O 2 + CHO -> H 2 O + CO 2 + energy –Decay of plant residues Mineralisation to CO 2

6 Grazing system carbon cycle

7 Carbon into the animal Structural carbohydrate –Cellulose, hemi-cellulose, lignin Non-structural carbohydrate –Sugars Fats/ Lipids Protein/amino acids Carbon from the animal As above in products (meat, milk, fibre) CH 4 and CO 2 – microbial digestion and respiration

8 Grazing system carbon cycle The Rumen Simple stomach

9 Grazing system carbon cycle Fluxes between carbon pools –Into soil Plant and animal residues Microbes –From soil Microbial decomposition Organic Carbon to CO 2 and CH 4 Baldock 2009

10 Grazing system carbon cycle Humus (~stable) <0.053 mm Respiration Photosynthesis CHO Plant Residues Litter > 2mm POC (~labile) > mm Carbon dioxide (CO 2 ) Decomposition Microbial Biomass Mineralisation Methane (CH 4 ) Nitrous Oxide (N 2 O) Baldock et al. 2009; Eckard, 2009 Nutrients In established pastures Photosynthesis ≈ Respiration + Mineralisation Photosynthesis ≠ Respiration + Mineralisation + Methane Decay

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