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John Hunt_Kiwiflux: different problems but similar solutions


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John Hunt_Kiwiflux: different problems but similar solutions

  1. 1. KiwiFlux - Different problems, same solutionsJohn Hunt, M. Barthel & J. Laubach, Lincoln, New Zealand
  2. 2. Talk outline1. Similar problems at one scale2. Example of research3. How TERN has helped (us in NZ).
  3. 3. Similar problems• Land-use change (forests, farming)• Intensification (agriculture, urban, people)• Resource allocation (water, soil, carbon)• Limited resources (money, experts)• Management (policy decisions, consequences)
  4. 4. Land-use changes and GHG emissionsNZ only 0.2% of world GHG emissions• NZ has unique GHG profile• GHG emissions increasing at high rate• Could be many advantages to decrease GHG• Trade implications • 100% Clean Green • carbon miles • trading partner perceptions
  5. 5. The importance of dairy farming in NZLocal importance• 4.5M dairy cows (1.6M Aus)• Increasing 1/4M per year• 16B litres milk/year• 95% dairy products exported• Export revenue NZ$12B per year, 25% exports
  6. 6. The importance of dairy farming in NZInternational importance• 2% of total world production of milk• BUT 44% of world traded butter 30% of world traded milk powder
  7. 7. Potential effects of increased cowsNitrous oxide Carbon exchangeMethane Water Soil nitrate + C
  8. 8. Research objectives• Three major research groups • Dry –> irrigated, plant rooting depth, DCD1. Measure effects on GHG emissions2. Determine major driving environmental variables3. Develop models for predictions and mitigation strategies
  9. 9. 172◦ E 43◦ S
  10. 10. 20072010
  11. 11. Dairy grazing system• 2 herds, 900 cows, 260 ha• Strip graze 3 ha for 12 hours• Milked twice per day, 24L milk/cow/day• 22 day return time • Large change in biomass • 500 kg C/ha removed • Dung and urine deposits • Compaction/infiltration
  12. 12. Measurement of GHG exchange Carbon fluxes Methane and N2O FTIR (Australian)
  13. 13. Ecosystem carbon exchange Beacon Farm
  14. 14. Change in carbon storage
  15. 15. Remote sensing to scale up r2 = 0.49
  16. 16. OzFlux and KiwiFlux• TERN aim “connect scientists… share data.. and contribute to effective management”• OzFlux • Loose informal connection of people • Tight control on quality and data use• KiwiFlux for political and funding reasons• OzFlux >26 sites, NZ 8 EC systems• Last OzFluz meeting was in NZ
  17. 17. NZ:Aus interaction• Raise profile of Oz and KiwiFlux in AsiaFlux• Has helped in NZ:Aust collaboration/grants • One success with U. of Sydney (ARC) • One pending with U. of Sydney (DAFF)• Allows NZ to follow best practice set in Oz• NZ can offer expertise in specific areas • Other ghg gases, isotope tracing, intensive agriculture, test models on different systems