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Flux investigations for intensive dairy farming, Hamilton Basin, NZ. Dave Campbell, Louis Schipper, Paul Mudge & Tehani Kuske Earth and Ocean Sciences University of Waikato. Context: Changes in TC and TN within NZ pasture soils.

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slide1

Flux investigations for intensive dairy farming, Hamilton Basin, NZ

Dave Campbell, Louis Schipper,

Paul Mudge & Tehani Kuske

Earth and Ocean Sciences

University of Waikato

context changes in tc and tn within nz pasture soils
Context: Changes in TC and TN within NZ pasture soils
  • Soils collected from previously sampled sites (17-30 yrs ago) had been archived and were reanalysed for TC and TN

Sites sampled to date

change in total c and total n initial 31 sites
Change in Total C and Total N—initial 31 sites

Top 1 m of soil profile:

Total C loss was about 1 t ha-1 yr-1

Total N loss was about 90 kg ha-1 yr-1

Schipper L.A., Baisden W.T, Parfitt R., Ross C., Claydon J. (2007) Large losses of soil C and N from soil profiles in New Zealand during the past 20 years. Global Change Biology, 13: 1138-1144

ongoing sampling
Ongoing sampling
  • Need more data to confirm landuse/land-form findings
    • Resampling of previously sampled profiles
  • What, where, when?
    • Hill country around Palmerston North
    • South Island – Pallic and Semi arid soils
    • Dairy and drystock
    • Tussock (native grasslands)
slide5

Research needs

  • Quantitative measurements of carbon exchange in relation to different farming practices—applications for EC
    • e.g. To what extent do the following practices decrease soil C?
      • pasture renewal
      • pugging/poaching
      • irrigation
      • fertiliser
      • feed crop production
      • etc…
slide6

Torehape peat mine

2005–06

Opuatia wetland

2003–05

Rukuhia

(dairy)

2002–03

Moanatuatua wetland

1999–2000

Previous work

Scott Farm (dairy)

2007–

Landcare Research

carbon budget for dairy farming on peat soils
Carbon budget for dairy farming on peat soils

2002-3 C budget

Nieveen et al. 2005, GCB 11: 607–618

slide11

Scott Farm site

  • Dairy industry research farm (Dairy NZ)
    • Focus on increased production vs environmental costs
  • Soils: mod. well drained silt loam
  • Landuse: dairy cow grazing + cut & carry harvesting
  • Research capability (from Dec. 2007):
    • Open path EC (CSAT3 + LI7500 + CR3000)
    • Soil CO2flux chamber (LI8100)
scott farm immediate research objectives
Scott Farm immediate research objectives
  • Annual CO2–C budget under typical NZ dairy grazing management
    • 3-4 cows/ha (rel. high land pressure)
  • Models of annual water use
  • Case studies of farm management practices: effects on CO2 fluxes
    • Cultivation/pasture renewal
    • Overgrazing/pugging (winter)
  • Long-term:
    • Simple models of farm soil carbon stocks & changes
thanks
Thanks……
  • DairyNZ and Scott Research Farm staff