Spatial Mapping

The geographic boundaries of where the carbon estimation is taking place needs to be identified to correctly calculate the project abatement. Differential GPS was used to map the boundaries of each block which successfully identified the carbon estimation boundaries and defined the project exclusion areas. The horizontal accuracy for DGPS is less than 10m as required in the CFI Spatial Mapping Guidelines

 

Soil Carbon Baseline

Numerous soil surveys were undertaken on the vineyard in 1998 and 2010 by David McKenzie. The surveys were based on digging pits to a depth of 1.5m, and samples from 30 cm deep were sent away to a laboratory to be assessed for the Soil Organic Carbon values and soil bulk density. The surveys were conducted before the introduction of viticulture which allowed the baseline carbon to be assessed.

 

Soil Carbon 2009

In 2009, soil samples from each block were sent to the laboratory again. Each block had 20 to 30 samples taken from different locations, to determine an average Soil Organic Carbon value for the block. In 2012, soil samples were also taken from 3 of the blocks in the same manner, and also from unused land for a comparison to the land that has been used from grape vine cultivation. The 2009 Soil Carbon contents were compared to the baseline. The SOC values for future years were predicted by a linear regression.

 

Vines

Estimation of the carbon stored in wood vines was done by measuring vines and calculating the volume of them An average volume per vine of each block was found by measuring 4 vines from each of the 18 blocks. Parts of the vine measured were trunk diameter (50 cm above ground), trunk height, cordon diameter (50cm from trunk), cordon length. The cordon and trunk were assumed to be perfect cylinders to compute the volume.

Carbon Footprit

The carbon footprint can be calculated by taking away the total amount of carbon emitted from the carbon sequestered. The electricity consumption, fuel usage, and fertiliser were all obtained from the vineyard management and converted in to a carbon quantity from an online calculator.