Increasing the quantity of carbon stored in agricultural soils has the potential to offset emissions of greenhouse gases to the atmosphere, while soil carbon losses would further add to those emissions.
However, realising this mitigation potential is technically challenging when soil carbon stocks are already high (as they are in New Zealand), potential changes in soil carbon are small and spatial variability is high.
The current NZAGRC programme has three distinct components:
(1) testing specific management practices that may increase the long term soil carbon store in field situations;
(2) developing and using models to predict how a range of management practices may influence long and short tem soil carbon storage; and
(3) identifying those factors that influence the stability of current or newly added soil carbon.
We have also supported international work to map on farm soil carbon and will participate in the international research programme CIRCASA.
Dr David Whitehead, Manaaki Whenua - Landcare Research (2010-present)
Professor Frank Kelliher, AgResearch (2010-2017)
Determining levels of soil carbon storage
An experiment was designed and conducted using a novel 13C stable isotope method to determine how the stabilisation capacity and saturation deficit of different soils affects their ability to store more carbon. Research was also completed describing a rapid, nondestructive method based on mid-infrared (MIR) spectroscopy to identify the soil carbon stabilisation capacity and saturation deficit of different New Zealand grassland soils.
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